Chevrolet Blazer, GMC and S10 Four-Wheel Drive Repair, Complete Vacuum Hose Routing and Replacement 

This fella needs his own show! Hahaha, he’s great!

I've been wondering how I'm going to fix my vacuum lines on my 2001 4×4 Chevrolet S-10. Now with our help I'm confident I can do myself. Thank you Allen.

22mm on that vac switch (transfer case) wrench fits, dont bother with a socket. "Dots or paint " is a great idea. The switch has a "key" blank nipple, keep that at 12 o clock, youll be looking at a ln upside down triangle of the 3 nipples. Left goes up to the Y fitting + meets the transmission vent line, they go up onto the furewall to the "vented cap" line thst dead ends there (on furewall by oil fill.. right of the upside diwn triangle goes to the sctuator under the battery, and left goes up to engine vacuum. Thought id add those tidbits. Great video my friend!

Day job and shot 22 minutes thanks for your time. This video saved my blazer from sitting untill I could pay someone to fix it. Took me a little longer than a day ok ok took me 2 days and a box of bandaids but I did it 🤓

EXCELLENT! Gotta love a guy that shows everything! Great job!

appreciate people like you that make these vids - we had 6'' of snow last week & I got stuck before I could even start plowing - taking blazer to a buddy who's learning as he goes w/this job ...didn't realize this system ran off of vacuum - I also notice a few people bypassing it all together & going w/a manual cable - all I know is I hope he can get it done soon

Haha, this guy is great! He needs to be on MotorTrend TV channel with his own damn show. New subscriber here 😉

EXCELLENT!!! This is a God Send! New to me Sonoma and a LOT of the lines are rotted or melted out, so I have no way to tell where they come from or goto. THIS video is very concise and pretty much unabridged. It sure will come in handy this week. I've watched it twice already and It's not even boring.

I'm mexicano, but this señor explain very well, remember me my grandpa, my respect for you Sr.

My friend, you explain, like nobody else, you video, saved me, a lot of money, i hope do you understand, I'm don't speak English, thank you a lot, appreciate it

Excellent video and very knowledgeable

OMG Thank you sooo very much. To be honest in the first 3 minutes i thought hmm this guy is probably only going to show me the line that goes under the fender ugh not another one. We get it it goes under fender what about the rest of it ?. benefit of the doubt i kept watching. Thank the stars i did this is the most explanatory and visually shown video on the internet about these lines . Simply amazing instructional video . been struggling with this for weeks now but keep getting hoses in wrong spots and cant start engine. You are a great video mechanic maker. Thorough and showing all aspects of the system even the parts as you said that were good you still replaced and showed how to where all others skip right over stuff like that when sometimes that is someones exact problem. Very well done i will be checking for more vids and subscribing. ty ty ty .

Thank You Very Much for posting this video. It was the only information I could locate online that showed and explained this process. It helped me tremendously for a 2001 Blazer that was missing vacuum hoses and a few were installed in the wrong locations

Thank you for helping us all with this! Very informative!!

Now this is a very helpful video. Thank you for the detailed vid. I'm gonna replace my old vacuum llines, those are cracked and burned. This is why my front diff. wont engage.

Thanks, Alan! I justed picked up a 97 S10 Blazer.

Good job on the vac lines and the video. Thank you!

thank you for showing everything great video just what I was looking for

Absolutely an excellent video, very well filmed and explained. Thank you for taking the time to make it and share with us. I'm fixing to replace all mine this weekend, now I know where they are and all go. Thanks again Art

Great job good good video enough information most mechanics don't want to help you with it . After the video i got it done you don't know how much it help thanks

Thanks from western Colorado!

Great work, we're facing the same job, same vehicle so thanks very much...huge help.

Good video! I just bought a 2000 Blazer, and I think I'll need to know that stuff.

Muchas gracias señor Allen God bless you thank you for making this video

Excelente explicación, muy didáctico, thank you For your explanation and dedication !! From Argentina 🇦🇷

Awesome video! Thank You!

You should do a series on S-10 Blazer and pickups.

Excelente explicación

That's a hard days work with all that getting up and down. Good job.

Also no 3/16th line, vent from tcase is 7/32, ALL OTHER LINES on 4x4/zr2 are 5/32..all of them.. (or 4mm for our northern neighbors lol)

Very very good explanation

This is amazing!

Thanks and appreciate the video. 👍👍👍

Great video buddy, definitely helped me out. Keep up the good work

tat helps me I found hole on the lines cut them off then plug them back again. It work but after I stop the engine and restarted it. The light came on again. so tomorrow .I will reset it turn the key off and on five times. thank you Allen.

I needed this a few weeks ago, but I still need this. I'm not quite got her done yet. You might have showed me a miss connect also.

Thanks Alan! Just what Id been looking for!

Alan is a Godsend

Excellent video good sir yes the vacuum actuator setup has many flaws that transfer case switch goes bad often especially once you've replaced the OEM one they just don't make things like they used to!

Justo el video qe necesitaba, good job, greetings from Chile!

It would really help if you would identify the year of the vehicle. Also there are two different 4wd systems on the blazer/jimmy. One has an auto 4wd bottom on the dash and the other does not. The have completely different vacuum routing and controls. Please identify which one you have. ( it’s the one without the auto 4wd button)

Great video.

Good job

Very appreciated man

THANKS A TON

Excellent video, I Have a 2002 Chevrolet S10 4x4 pickup. I'm thinking it's probably the same configuration.

good video!!!

This is Pablo from Argentina, I have a 1992 S-10 4x4 4.3L V6 Blazer and I have a problem with the 4x4... it is stucked in 4x4 and I can't take it off. I don't see any issue with the hoses and vacuum lines, but the actuator that it is under the battery doen's do anything automatically... if I took off the hose and suck in it it works but it doesn't do anything in the gear... when the engine is off and I press the 4x4 button I hear that a little starter motor that it is on the main gear it turns on... but anything is moving! I checked this great video, but I need my help! thanks

explanation of vaccum hoses were excellant. so glad i could keep up with you explanation, . good job

Good video 📸 thanks just got a jimmy good to know 😂

Bravo

What size vacuum hoses will I need? Want to tackle this on my Mom's 97 Blazer.

Awesome video going to do this soon they're super rotted. 4x4 works but I'm having a rough idle issue, can these lines possibly be the culprit or would they just impact 4x4 and hvac?

Could you comment on what sizes and how much of each size line you used? Thanks for the video.

Thank you so much for the video, very helpful. I have to tackle this job. 4x4 not working, lines dry rotted and ripped. Prior owner rigged a bypass from actuator straight to the t for reservoir and vac system. Trying to correctly pick the spots for T connectors and what those goes where now. What year is this vehicle? I have a 2003 s10 4.3 and I do not see the connection of vacuum lines by the reservoir tank. I only see a T connector that holds a line to the engine then a line to the actuator then the line to the vac system. No lines hooked to reservoir port on the fender wall. Do I need to add a 2nd set of lines with a T connector connecting all?

how much of each hose do I need to buy for this repair?

Are all 3 hoses coming from the pcv valve just breathers? Im having trouble figuring out which one is a vacuum line and which ones are vents

Bought a 1999 Chevy blazer from a guy super cheap, $250… The guy tried replacing the vacuum lines not paying attention how the vacuum lines actually went. So it does not go into four-wheel as of now. Some how he has transmission fluid into the motor oil now. All I want this vehicle for is to pull a ice fishing house on a lake. I don’t care if it gets locked in 4x4 and stays. One purpose for this vehicle. So I have two options. Try to re-route the vacuum lines correctly or just install a push,pull, and lock cable. It runs good honestly but vacuum lines are completely messed up. So where did he mess up to cause transmission fluid to enter the motor oil? Any advice would be greatly appreciated.

Where did you get your vacuum hoses from?

sir there is another line mid way from the transfer not hooked to anything did you see it i have fluid coming from it' on top hard to get to not the vent from transfer , thanks James

Simple yet perfectly detailed video, props Alan 👍🏼 well done. Do you think you could take a picture of the vacuum diagram sticker on the driver side of your fan shroud for me when you find a minute? Not sure if hou can post it here, if you are okay with emailing it to me let me know please. Thank you Sir.

Hey Alan do you know where the vent tube on top of the transmission goes it's on the right side of the top of the transmission

Where are you and what would you charge to replace my vacuum hoses? Thanks in advance :)

Could a bad vacuum line keep the vehicle from starting?

Great Video !! How lone is the 3/16 hose from the actuator to the transfer case ? How much did that transfer case switch cost?

Allan do these older GMs tend to have these issues

Nice Old youtube video. Just meat and potatoes.Nice Job!

well I changed one but I can't hardly get the 5/32 hose on the T so easily advice???

Can you tell me the sizes hoses, sorry for my English, hope do you understand my cuestión

This is what I need to do and not looking forward to it

I have a split in one of vacuum hoses coming from the switch. Not really looking forward to this repair

Arlo Guthrie

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Thank you. Been working on my S10 4x4 for a few weeks. I got it cheep all vacuum line at gone. None to trace. I had all right but I had 9ne missing and it's the vet lines out of case. With a broken c5 c6 it's hard to hold up you head and under then back on top. God bless and have a good day.

Qt h

Bruh looks like everyone’s drunken uncle