GMC Sierra: Stuck On Defrost

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In this video I have a look at an older GMC Sierra that had a customer complaint of the HVAC being stuck on defrost. My gut told me "prolly just a bad actuator." However, the data showed us something different.
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

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13 мар 2021

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Комментарии : 1,3 тыс.

@SouthMainAuto 3 года назад

Guess I failed to mention in the video that customer had all ready purchased a new OEM actuator. Just to be sure I wasn't crazy I tried it but knew it wasn't gonna work from our test results. He told me to just leave it in because he already bought it. 🤷‍♂️

@jdrs4214 3 года назад

Now that’s what you call a Vehicle Air Conditioning System Crash.

@johnjames432 3 года назад

Had a focus that a blend door seal was all so the problem after it was warm stick like glue 🤣

@boforgault3212 3 года назад

Hack Mechanic my arse. You are the Sherlock Homes of the Auto World

@The_Redkween 3 года назад

I’d lay down a $400 bet that the owner will not want to tear into the heater box. I know I wouldn’t. 😂

@manorin 3 года назад

27:04 MFG March 30 2020

@jackrichiedei 3 года назад

I remember when it was cable operated and never went bad. slide the lever left for floor, middle for vents ,right for defrost.

@buckhorncortez 3 года назад

I remember when gas was 23 cents a gallon. What's you're point...?

@john7017 3 года назад

@@buckhorncortez And I remember when people were courteous to each other...

@antonoudenhoven7573 3 года назад

@@john7017 best reply to a troll,well spoken sir

@valvemonky4734 3 года назад

@@buckhorncortez what's yours ..?

@Jihadbearzwithgunz 3 года назад

I had a cable break but it was a easy fix. Even the old vacuum driven systems were easy to fix if it's not working more then likely a vac leak cause the vacuum systems themselves rarely failed. If they did it was they sat for too long and we're stuck easy fix.

@gregsimon1285 3 года назад

Every once in a while I find a channel that I like so much I start binge watching it’s old videos. Yours is one of those. You mix education, practicality and a dry sense of humor to make a very entertaining product. Thanks for what you do.

@rons4452 3 года назад

That is only in the first 50 videos LOL

@gfd1166 3 года назад

i was doing just that today... cued up the CHEVROLET list & let 'em play. Made it through 30 of 'em.

@QBRX 3 года назад

Yeah, he's absolutely the best!

@Sprnklrmn 2 года назад

Yep. Me too. My kids are sick of it. 😆

@1musicsearcher 3 года назад

Figuring out that the arm was traveling too far from the remnants of foam laying around proves you’re a genius!

@WatchWesWork 3 года назад

Very interesting! I had the opposite happen with an old GMC truck. The blend door had warped and would never reach the full 5V position. If you put it at full hot it would continuously fight the warped door and eventually burned out the actuator motor. I also gave the customer two options: Tear apart the dash and heater box to replace the blend door, or take a small file and turn the squarish drive slot in the actuator into more of an hour glass shape. You can guess which option they chose!

@edwinpadilla6093 3 года назад

WOW I got the same problem it doesn't reach five !

@samcripes3046 3 года назад

That's great to know! I'd never thought of that or seen it!

@valkokir 3 года назад

Do customers appreciate what an amazing mechanic you are? I can't imagine most people figuring this one out without a huge bill for parts not needed. You're awesome.

@stevewesley8187 3 года назад

Just shows electronc theory knowledge is necessary , but so is theory of mechanical functions ! Good job !

@Asto508 3 года назад

Ye, being able to read schematics and have a basic understanding of circuits is a minimum today. Not much is required beyond that though because if electronic breaks, you can only replace it as a whole. I doubt that Eric would go into soldering broken resistors and capacitors simply because of warranty.

@mshafer2006 3 года назад

Not a hack job by any stretch IMO, I call it re-engineering to save the customer money and time without the vehicle. I wish I could do that sometimes. I can’t as a warranty only technician.

@trevorkosolofski8976 3 года назад

My thoughts exactly! This is by no means a hack job. It’s a simple long lasting solution to a very expensive repair.

@thesearcherman6652 3 года назад

Michael Shafer- What does a warranty only technician do for money? How do you live without money? Auto manufactures sure as hell ain’t going to pay even minimum wage to fix their cars.

@franksgarage8551 3 года назад

Had a similar problem. Took actuator apart and moved internals so door bottoms before the potentiometer tops out. “Manually calibrated” Foam missing, time for a colonoscopy!

@JCHD18CVOLim 3 года назад

The first thing I noticed was what looked like "popcorn" under the dash and on top of the dash. Who would have "thunk it" that was the root of the problem. Great Video Eric.

@MikeBrown-ii3pt 3 года назад

"Back in the day"...when the "HVAC" system position was controlled mechanically by a sliding lever and a wire, these problems were few and far between. Thank God for progress (he types with a whole lot of sarcasm)!

@MikeBrown-ii3pt 3 года назад

@John Stone Rookie hell! I'm 52 years old and have been working on everything from lawn mowers to semi tractors since I was 8. I'm calling bs on you!

@russdavis1960 3 года назад

@John Stone troll

@MikeBrown-ii3pt 3 года назад

@John Stone You have a right to voice you're opinion and I'll always support that right...even when your opinion is wrong! Have a good night.

@rons4452 3 года назад

Back in the day there was no youtube So who was or is better off ?????

@christhomas9016 27 дней назад

Guess the days of cracking a wing are gone too..

@robgrasso947 2 года назад

I cannot express how thankful I am to have come across this video. Mine has been like this for about a year. I tinkered with a few things before looking on RU-vid. I followed along and was able to do the same fix. Everything works as should now. Thank you so much for taking the time to help others out.

@mariosaccoccio1688 3 года назад

"You can't go to war until you know what you're fighting!" Every married man knows that!

@yqwgjsg 3 года назад

Yes and worst food for a man to eat...... is wedding cake.

@sjgoff 2 года назад

I am amazed at your logical diagnostic process. I was a service manager at a GM dealer for 13 years and I doubt any of my techs would have found this without just replacing all the external parts. Well done sir!

@dennisgundlach87 3 года назад

Thanks for having us back, South Main Auto, always welcome in this house

@rodneymiddleton9624 3 года назад

The last one that came in the shop all 3 motors were bad, mode, blend and recirc. The recirc motor was the worst to change. The customer brought me all Dorman components. Needless to say they were all junk and worked a couple times before they failed. I ordered ACDelco components and worked like a champ! Thanks Eric O!!

@ApexHotShot Год назад

Eric, this diagnosis and solution, for me, validates your diagnostic technique. By following those proven steps you verified that the usual suspects were Not the problem and that led to creative / outside-the-box thinking … eventually resulting in a leap from blend door foam fuzz to an extended run on the defrost actuator. Absolutely brilliant!

@RickTrajan 3 года назад

Her: "he must be thinking of other girls." Him: "how do I fix that damn truck?"

@kawasas 3 года назад

Hi Eric O. Lots RU-vid are saying that need power reset by taking fuse out.

@randymarion2466 3 года назад

If it is not that 'Damn Truck', it has to be 'Where's the nearest ice cream?'

@SouthMainAuto 3 года назад

@@kawasas not this style. I double checked. It's the latter models.

@johnnyheckard7185 3 года назад

@@SouthMainAuto Yeah the old battery cable or fuse pull to perform a reset or relearn on these usually only temporary they will do it again and again until you fix what it’s fussing about.

@weshawkins7165 3 года назад

Love your videos Eric. The thought process that you use and describe as your doing the repairs is as valuable as showing the work. Good job.

@scottboyne8305 3 года назад

I can't believe I'm 57 years old and I binge watch your videos all the time. You are an excellent mechanic, and you're funny too. And I like when mrs O makes an appearance. Very entertaining

@jwark6 3 года назад

in 2016 when I worked at a Chrysler dealership we had a service bulletin to re-flash the BCM in many Jeeps because the foam that sealed the blend door to the box would get smushed and collapse over time causing the actuators to go past a programmed "limit". The flash just increased the voltage limit the computer would allow as acceptable.

@markh.6687 3 года назад

Some Fords have similar issues; Dorman makes a blend door repair kit that doesn't require removing the whole dash to fix the failed foam issue.

@notsureigaf 3 года назад

I can't believe GM and Chrysler engineers never considered that this could happen and program some sort of fail-safe other than "stop working entirely." Actually yes I can believe it.

@markh.6687 3 года назад

@@notsureigaf Or design it right and eliminate the failure point entirely.

@notsureigaf 3 года назад

@@markh.6687 That kind of thinking is what brings on failures like this in the first place. You should always have a backup plan or fail-safe even if you're sure you designed something right, so that if you end up being wrong about your design, at least some poor schmuck doesn't have their HVAC stuck on defrost.

@MrGHOSTMAXX 3 года назад

This is very insteresting, I always wondered why some models of Jeeps always had blend doors breaking. I guess they go past their limit like you mentioned, and break the door or shaft. I've even seen a Jeep with a upgraded aluminum all blend door snap the door right off the shaft.

@rhinogear 3 года назад

THANK YOU! Watching the actuator operate, seeing WHERE the panel position is and defrost position is under the dash on that wheel makes ALL the difference! Also knowing what position to have the switch in and where to set the gear under the dash. Thank you! Love the channel~

@ShallowGraves01 3 года назад

You are a genius. Trailblazers have the same issue. A person could spend a lot of money and many shops would never figure it out the way you did. Simply amazed. You are awesome.

@mjalco7410 3 года назад

You are awesome for not giving up and coming up for a fix for the problem. Love your channel !

@noeygarza6522 3 года назад

Back in the early days, we just make sure your vacuum line was connected.

@kevinreigle8282 3 года назад

you go above and beyond what most mechanics would ever do,, ABSOLUTLY FANTASTIC,, if you would not of done what you did that costumer would never had his heater control back,, YOU SIR are the BEST

@MattAlthouse Год назад

I’ve been living with this problem for two summers. Now it’s fixed. I could give you a hug.

@timsigers3327 Год назад

This happened to my old Silverado today. I opened the little motor, and observed what you observed on your meter; if you put the knob all the way to defrost, the little motor would not stop spinning. I probably would not have come to the conclusion that the foam had deteriorated, allowing for over-travel. I watch all your videos, and just happened upon this one by chance. I appreciate you taking the time to teach the rest of us, and making it entertaining in the process!

@ColdStartAuto 3 года назад

Ooooh! I know this solution even before you start. Wish you woulda made it before it took me 3 hours to figure it out. Fun fact!! The part numbers between the mode, blend, and third door (or auto air trucks) actuators are interchangeable, as in they fit and plug in perfectly, but are NOT the same part. It will cause it to act strangely. In my case, the mode door will act backwards. (Air on defroster when on vents, vise versa) Also. When diagnosing do not plug the new actuators in when not installed to “test.” They will work, but can move farther than they’re supposed to when installed and they will ruin themselves. I know all of this because I personally did all of this a few times.

@jackfentress0281 2 года назад

So what did you do. I have the same problem as you did

@ColdStartAuto 2 года назад

@@jackfentress0281 edit: wrong reply If you’re having them work backwards you have the wrong acuator in the wrong place. The blend door will not work in the mode door spot, even though the look exactly the same and plug in. If you over extended the actuator you can try to get it back with a 9V battery, but normally they are ruined. Good luck.

@132isaac Год назад

@@ColdStartAuto how do you move with 9v battery?

@ColdStartAuto Год назад

@@132isaac you use two wires coming off the 9v, and touch them to the posts on the actuator to get it to move side to side. If you locked it all the way to one side it’s already toast tho

@brandondvorak4438 2 месяца назад

@@ColdStartAuto on my 2002 I replaced with a doorman. I hooked it up prior to install. It moved quite a bit. Then read ur supposed to put them in first before powering. So I took cover off and lifted the one gear up and then repositioned the marks like they were before and put Gear back down and cover back on and installed it. Worked great for a few times then quit. Could it be doorman are trash lol?

@fevengr9245 3 года назад

Eric: As a retired engineer, I’m embarrassed that someone in my profession would design a system to fail in such an obscure way through nothing more than ordinary wear and tear. But good on you for going the extra mile to figure it out! I’m sorry you had to go through this. I imagine that GM considers an HVAC system design that fails as the foam disintegrates to be a “feature”.

@brianmiskell9090 3 года назад

Ran into a very similar issue and the passenger compartment filter was never changed and the air flow was keeping the actuator from moving it's full sweep. Good stuff man. Enjoy the hell out of the gm videos as I have the pleasure on working on that crap everyday

@saltcar 3 года назад

Impressed with the logical approach and analysis of this. You just don't get this at most shops, dealers included. Nice job. Keep it up!

@topcat5777 3 года назад

I am beyond impressed with your diagnostic skills; thank-you very much for making and posting all the videos you have done! I wish I was 1/10th skilled in understanding electrical schematics...and knowing what appropriate tools to use and how to use them relating to electrical components. But then again, that's what trade schools are for and taking the theory and putting it into action. Be well and be blessed.

@lawrencetickle2706 3 года назад

Man I was just thinking, "It would be nice to have a new SMA video tonight."

@labradormcgraw 3 года назад

Strange... I wasn't.

@lawrencetickle2706 3 года назад

You're right.

@Dirtyharry70585 3 года назад

Yeah, Ivan has two videos before Eric. Must be the NY snow.

@-BuddyGuy 3 года назад

I was thinking it's time to sleep or I'll be exhausted tomorrow. Fuck

@rons4452 3 года назад

Guess what? Your girlfriend was not thinking the same thing LOL

@wirenutjoe 3 года назад

Nice! Who would have thought of missing foam. Glad thing you had some missing foam laying close the area to give a clue. Great job

@darrylhowe1465 3 года назад

Above and WAY beyond. I would like to extend my appreciation to the depth of effort and expertise you apply to these difficult diagnosis.

@dougkubash8673 3 года назад

Great video Eric! I just retired today - 42+ years wrenching. I will be lost without the 'theory and operation' section in the service manuals, lost access to the service manuals when I retired. On this problem it wasn't enough information. Great fix!! I own a 2012 Sierra so if this problem happens on mine it is getting the 'screw fix' Keep the videos coming!

@tedchristman164 3 года назад

You can Hack any of my rigs any day!

@brianthompson2045 2 года назад

I am shocked this channel is not over 1 million subscribers. Great job!

@danparker1925 Год назад

SMA to the rescue!! I spent so many hours trying to install this. I thought I was clocking it out of time and couldn’t get it to go back to panel. I installed the screw in the cog wheel as per your instructions and wow, it’s perfect. Thank you so much

@hankhessig6586 3 года назад

Ouch - I certainly wouldn't have suspected the loss of the sealing foam would lead to the mechanism not working. Good lesson for sure

@andrewrae2813 3 года назад

the old cable controlled system was a lot less headache. another good video, tnx

@steveb6103 3 года назад

It's a whole different world down south. Instead of salt it's the heat that rots anything plastic.

@ctbale1 3 года назад

And rubber!

@cward1954 3 года назад

Turns plastic into a brittle mess.

@autotek7930 2 года назад

Heat. sand and lack of humidity here in El Paso... lately we been getting a ton of rain tho but everything is already rotten lol

@michaellong6695 2 года назад

I want to thank you for such a great review of this issue. I have been trouble shooting this same issue on a 2002 2500HD for a month. I replaced the actuator for the same failure and had no change. Still stuck when switched to defrost. After watching your video, I went back and checked signal voltage again with the same 5v shut off at defrost. Added the screw to motor housing and it works perfect. Who would have thought that foam seal could cause this much of a problem. Thanks again.

@davidmcclain5180 3 года назад

I live in the Phoenix metro area and if this customer lives in the hot area of Arizona (not Flagstaff), the heat we have will destroy the foam and it comes out in pieces as you observed. Great diagnosis and following your procedures kept you on the right track. Also being persistent is the thing that pays off. Many times I've wanted to give up but if you keep thinking and testing, most of the time you'll find the answer.

@brianjohnson5144 3 года назад

I'm proud of my self I kept saying put a screw in it and you came up with the same repair. I really enjoy your videos

@sarahdeshay1394 Год назад

I early on suspected that the door was moving to far and a stop screw would remedy it.

@TheMetallicafan88 3 года назад

working on southern vehicles is always a treat!

@dlewis9760 3 года назад

Might not need to defrost the window, but the foam (if that's what it is, don't know unless you rip it apart) isn't going to be a climate thing, it's going to be a age thing.

@biz4twobiz463 3 года назад

West... west are the best! haha

@61rampy65 3 года назад

Southwestern vehicles all have extremely brittle plastic pieces and rubber parts. Gotta be extra careful to not break stuff.

@tysshed5807 3 года назад

@@dlewis9760 the heat and dry air dose kill plastic parts even here in Missouri the summer heat murders dashes and interior bits. But in the north east the salt eats the cars so it's a give and take

@christiaanbrown4278 3 года назад

My truck-no rust, no plastic (lives in Arizona). All my plastic is so brittle that a good bump will send pieces of the dash to the floor.

@SuperBigdanno 3 года назад

Good for you Eric for saving the customer money! Refreshing to see

@troymurphy6471 3 года назад

You saved me a ton of aggravation, mine had the exact same problem. Thanks keep up the good work.

@randymarion2466 3 года назад

I just knew you were going to go full 'Ivan' on this!!! Nice job, way to go!

@rons4452 3 года назад

Who is Ivan ??

@tysshed5807 3 года назад

@@rons4452 garage 51 I believe is the RU-vid channel it's a Russian mechanic that dose all kinds of stuff to old shitboxes mostly for entertainment

@randymarion2466 3 года назад

@@rons4452 Ivan of Pine Hollow Diagnostics ... A young man yes of Russian heritage, but a genius in diagnostics and repair ... He often will take something that is broken and take it apart and figure out how to fix it.... Sometimes his repairs are a bit out of the box, like this one from Eric at SMA. Check out his channel... You won't be disappointed

@alward9901 3 года назад

Ivan would be proud . Almost a Russian fix. Great fix and diagnose Eric

@markh.6687 3 года назад

In Mother Russia, heater control pins YOU!!

@reecenewton3097 Год назад

@@markh.6687 In old time Mutha Russia, got no heater control, no heater, no truck, just Gulag.

@SpringfieldSheriff 8 месяцев назад

This is the best description repair out there for this issue I’ve had several vehicles come in my shop with this issue and this video has saved me several times.

@jayneville1 2 года назад

This video saved the day for me. Had a k3500 farm truck with 300k on the odometer in the shop with the exact same issue. (Foam on the floor and all...)Tested by flow chart and everything checked out... Tried a used panel, still no return from defrost. Going in to work this morning and put a screw in that new OEM actuator I hung on it yesterday morning. Thanks for all you do. You just got a new subscriber that will be sharing your work with others in the field.

@AntonioClaudioMichael 3 года назад

Nice find Eric O interesting the foam being blown out caused it to hyper extend and the potentiometer didn't like it nice repair with a screw @SouthMainAutoRepairLLC

@LFBsmokealarm 3 года назад

Just got into bed here in UK and an SMA video comes live. Ah, perfect timing.

@jacknasty6940 3 года назад

Cheers mate

@connomar55 3 года назад

Need to move over to USA like I did lol!

@rons4452 3 года назад

You know that sounded KINKY!!!

@LFBsmokealarm 3 года назад

@@rons4452 Upon reflection I could have worded that better! 🤔

@rons4452 3 года назад

@@LFBsmokealarm Ha Ha Ha Too funny!!!!

@gkin20 Год назад

I had a two part problem as the actuator had a split plastic gear inside and would do nothing. I replaced it but low and behold it would stick in defrost after going through the motions. I watch all the time and searched your videos and came across this one. Guess what? That awesome screw mod worked wonders! Good enough for me seeing it's an 2003 gmc. Funny thing, I've never had to do anything to our tacoma or tundra. 😀 Thanks for all you do from being a great service to your community and bringing us these very helpful video's. I didn't even use my big fancy scan tool! 😜

@garymeredith2441 2 года назад

As usual Eric you are a source of Education on these blend door's for the AC and heater systems unlike the old cables .

@jimpie231 3 года назад

A work around! Welcome to Today’s world! Jim PS.....GREAT JOB!

@fascistpedant758 3 года назад

It would have been interesting to try a small resistor across the ground and signal to keep the voltage below 5V. I may have done a similar hack on a TDI or two to limit travel when the manifold runner control linkage wears a little. Sure beats a new intake manifold from the dealer.

@joshuabush3870 3 года назад

That's always been what I've had issues with is finding service data and a base line of info unless testing against a known good part which isn't always cost effective pending year make and model..thank you for all your knowledge and work and sharing.! You're videos are awesome 😎

@ethanbeveridge5780 2 года назад

Thanks to this video I got my truck fixed because it was doing literally the same exact thing as this truck I tried everything but once I watched this video I knew exactly what was wrong and how to fix it I had the same intentions to what you had when you were diagnosing this truck I’m glad you made a video about this because no one else did

@antonoudenhoven7573 3 года назад

Am i the only one that give a like before watching the video Greetings from a big fan from the Netherlands

@javierferrer8598 3 года назад

I give him a like before the videos on all the videos because I know they're all good 👍👍

@unclemarksdiyauto 3 года назад

Yep Anton, you know Mr O's video is gonna be a good one, even before we see it. He is a good tech/mech & teacher!

@rons4452 3 года назад

AWWWW no little red heart for you!!!

@antonoudenhoven7573 3 года назад

@@rons4452 shame lol. Can't sleep now hahaha. Can't get it all

@Cheepchipsable 3 года назад

Shows you are undiscerning.

@javierferrer8598 3 года назад

Good work I bet he keeps it like that since this old truck and it costs an arm and a leg to take a dash out 👍👍

@forkintherode8236 Год назад

You are a true sleuth. What impressed me the most is when you said I thought about it last night. Excellent

@ShadoWave2 3 года назад

Love watching your videos. Even on my days off, I enjoy learning more about car repair and using it at work. Also, every mechanic could be considered a "Hack Mechanic" if you watch them long enough.

@davidarnette327 3 года назад

Me-maw would be proud!

@specgrade3275 3 года назад

I wanna go back to the days of levers and cables. None of this electronic bs.

@christhomas9016 27 дней назад

Remember when blend door meant each down on the outer kick panel and pull the handle had way back, and all that cowl air got your ankles and shins?

@cbro6535 3 года назад

These are by far my favorite model of GM trucks so easy to work on and the last forever if taken care of and the rust doesn’t eat them alive

@65bugnut 3 года назад

That was a good catch Eric. It makes sense, because the truck is from Arizona. It gets very hot in the summer, and the foam seals on the blend door could deteriorate over time. Well done.

@jeffreybegeman9544 3 года назад

I thought I was watching Vice Grip Garage with the "Well I'll be dipped" quip.

@lackeydehackey405 3 года назад

The Avoca rodents ate his foam. I wonder if a 5.0V Zener would clamp that signal at 5. The electrical way of the screw. Keeps it from going over 5.

@lwilton 3 года назад

If I recall standard Zener voltages were 4.7 and 5.1. The screw fix is probably a better solution.

@michaelpolimer2128 3 года назад

@@lwilton if you put in a 4.7v zener to clamp the voltage, when the zener started to "zener" it would draw a lot of current (limited by the controller, maybe) and possibly over stress the source or the portion of the pot above the wiper. the screw was an elegant solution. I figured Eric would epoxy in the nozzle from a can of Brake Clean!

@lackeydehackey405 3 года назад

@@lwilton NZX5V1B would do

@sparcnut 3 года назад

I would have instead ohmed across the pot (i.e. tested the resistance between the actuator's ground and 5v reference pins), then added an appropriate value resistor in series with the actuator's 5v reference pin. For example, if the pot was 10K I'd bet that adding 220-470 ohms in series with the actuator's 5v reference pin would do the trick. This basically adds a bit of fake unreachable "range" to the 5v end of the pot's resistive track without any undesirable loading effects. The pot is clearly just being used as a simple voltage divider, and this sort of minor addition to the pot's overall resistance is not going to bother the controller at all. The pot itself probably has a wider tolerance rating than adding 470 ohms to a 10K pot would introduce (+4.7%) anyway - it's probably only a 20% tolerance part to begin with!

@Quazi1966 2 года назад

Sometime needs must. I purchased a door actuator fo a Hyundry to find that the worm gear on the motor gear was a lefthanded one instead of a righthanded one. I just swapped the polarity of the motor supply and it wound the gear the other way, worked a treat! You did an appropriate fix under the circumstances surrounding the problm and the vehicle.

@usethenoodle 2 года назад

You are one sharp diagnostician. Rotted foam on the blend doors. Amazing!

@davidhinkle2207 3 года назад

Could the lack of foam on the doors be causing the lack of air flow

@sanctealphonse4510 3 года назад

Can't believe you're only at half a mil subscribers. Figured you'd have Kilmer, Eric the car guy and Chris Fix dying to do collabs with you so they'd get more popular.

@Mattvardaman 3 года назад

I have this same truck and same mode door problem. If I climb under the dash and help it off defrost then it works great, if it ever goes completely to defrost then it’s stuck again. I refused to buy a motor to replace one that’s working, glad you figured it out for me! I’ll take it apart one day this week

@bm20091 Год назад

Dude, bro!!! Man... I'm at a loss for words. I LIVE, ON RU-vid! [Yeah, it's lonely.] But I've watched a looooot of videos...from education, entertainment, art...And I believe this is the BEST educational/informative video I've ever viewed! Your play on words and casual tone, explaining circuits and currents, and how it all operates, is beyond compatability for the common person. Not quite sure if this will work for myself, or not, but glad I viewed it either way. Thanks a ton!

@johngrabinski4873 3 года назад

your the only mechanic in the world who would have figured that out quickly without throwing parts at it

@user-fm6ny3uo2b 3 года назад

Sorry John, good mechanics all work this way. Logically and using the proper diagnostic approach will get you to a solid conclusion almost every time.

@dlewis9760 3 года назад

30+ years from now, the old car hobby is never going to include cars of the last 20+ years and probably not the future. It's the plastics that are going to send cars permanently to the bone yards. Instead of the term "Rust never sleeps" it's "Neither does synthetic foam and plastics degradation". Being a southern car isn't going to save them either.

@fascistpedant758 3 года назад

ICE cars are better now than they've ever been and probably won't get much better as electric cars will be taking over. 30 years from now people will be fighting over today's cars.

@robertc8056 7 месяцев назад

Thank you sir. It's great to see someone that makes things work instead of insisting on new parts at unrealistic price points.👍

@jamesgarrett5537 3 года назад

I found this channel awhile back not sure when and it is one of the best on youtube keep up the good work Eric

@paulog8813 3 года назад

Great diagnosis. I hope I had a true mechanic like you nearby. Let me ask you. Is moving to Rio de Janeiro, Brazil ou of the question? 🤔

@SouthMainAuto 3 года назад

😂👍

@korton3665 3 года назад

I work at Chevrolet dealership 7 years ago we started having the same problem

@rons4452 3 года назад

How do you like working on foreign cars?

@RedCan_Rick 2 года назад

Your screw-stop hack worked in my situation. New actuator, would stick on defrost. I thought I was calibrating the doors wrong. Thank you for the great tip!

@Alex-ev8ke 2 года назад

This fellow did one of the best RU-vid Videos ever made - thank you for your thorough presentation - you should do your own TV channel!

@AntonioClaudioMichael 3 года назад

That is interesting its like there is a problem with the electrical that is causing the actuator to get stuck Eric O @SouthMainAutoRepairLLC

@IgorD33 3 года назад

If nothing broke we would not have SMA videos

@travkel33 3 года назад

Finally a video that actually helps find out what is wrong with my Mustang blend door sometimes it works most of the time it's stuck on defrost thank you so much

@rakentrail 3 года назад

Just had a similar situation on my 2001 GMC Sierra 1500. Followed your tests and mine wouldn't move when jumped so I bit the bullet and picked up a new motor. All good now! Thanks!

@hpelisr 3 года назад

That 200,000 miles was just getting to Eric's shop. Nice work Eric, I need to look at my S-10 it is doing the same. Thanks I heard that comment about being a Hack.

@TheMechanicj 3 года назад

It’s the vacuum line going to the drivers side fender urs is not electric it’s vacuum operates I’ve repaired hundreds of those line s

@hpelisr 3 года назад

@@TheMechanicj yes I did have a problems with that. I will have check again. Thanks

@David1pearl 3 года назад

Yeah it is a fun time to find that port let only push a tube on It. Hope you are good working with a mirror.

@kevinbarry71 3 года назад

After all those years in Arizona; it probably never use the defrost before. Welcome to winter

@richardbambenek2601 3 года назад

The Arizona heat destroys cars, not by rust but by rot.

@kevinbarry71 3 года назад

@@richardbambenek2601 yes it does. But still better than rust

@johnadams3152 2 года назад

Great detective work Eric. Outstanding. Keep those videos rolling.

@webstersalyer 3 года назад

This is the way a help video should be done. Great job!!

@MegaDysart 3 года назад

I'll be dipped! Someone's been watching vice grip garage

@marksmith6104 3 года назад

If a serial criminal was being investigated by Detective O, we all know how that’d end.

@rons4452 3 года назад

Yea by subscribing and commenting!!!

@NRCustom 3 года назад

My buddy's plow truck has this exact problem. Sending him this video, he'll be very happy.

@CraneofBoulogne 3 года назад

That is good work Eric! Your ethics should help restore the public's trust in automotive repair shops.

@stoneblue1795 3 года назад

"I'll be dipped"..... Copyright Vice Grip Garage. : )

@HOBrian2003 3 года назад

I guess we know Eric watches Derek!

@goodfellasinc.5648 3 года назад

Vgg did not come up with that my Grandpa's been saying that since world war II lol not only that this guy will run circles around Derek we should all have a build off nobody wants to participate anymore in a friendly build off

@halleffect1 3 года назад

@@goodfellasinc.5648 Eric is frigging awesome but don't sell Derek short. he's a very good mech

@dlewis9760 3 года назад

"The Beans" - Sarah -n- Tuned

@mikeybhoutex 3 года назад

@@halleffect1 Indeed, his recent three parter for the engine build of Independence is good stuff indeed! Also, the block turned out fantastic, can't wait to see it run!

@ryguy57106 3 года назад

Get the parts cannon out!! You’ll eventually get it 😁

@markh.6687 3 года назад

"I can rig a stop for the circuit, but she won't last fer lang! I canna be responsible for th' safety of the dashboard, Jim!"

@ronallen6578 2 месяца назад

Eric, I have this trucks 1/2 brother from another motha. Within 1000 miles and its an 02. Gives me something definite to look for. Only difference is I've never seen any of the foam anywhere. Here I go, but at least I'm armed with a boat load of wisdom from Eric O. Thanks a ton, Ron