Foxbody Coolant Leak - Heater Core Bypass How To/DIY

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On this episode I show you how to track down a coolant leak on your vehicle - specifically on a 1987-1993 Ford Fox body Mustang 5.0. I had recently changed the water pump on this 1990 Ford Foxbody LX Convertible 5.0. The client had mentioned that he noticed that there was coolant on the garage floor under his car. After looking at the car we could not find where the coolant was coming from. Finally we noticed that the coolant was coming from the passenger firewall area which is a tell tale sign that the heater core is leaking. In order to change the heater core in a Foxbody Mustang, the whole dash and console needs to be removed. Alternatively, the heater core can be bypassed to rectify the leak until a later date when you have the time/money to fix the leaking heater core. Follow along as I show you how to bypass your heater core on your Fox body Mustang.
🔗 LINKS TO THE PRODUCTS I USED IN THIS VIDEO 🔗
☑️ Heater Hose Bypass: amzn.to/3sQlfbI
💥If you like this video, you might also enjoy some of my other Foxbody Mustang related Content:
📽 93 Cobra Vs. 20 GT350: • Foxbody Mustang 5.0 19...
📽 Which is the BEST Foxbody: • Buying a Foxbody Musta...
📽 Foxbody Burnouts & LOUD Exhaust: • Fox Body 5.0 Mustang E...
📽 TOP 5 First Foxbody Mods: • TOP 5 MUST HAVE First ...
📽 Top 10 Reasons to buy a Foxbody NOW!: • Top 10 Reasons to Buy ...
📺 If you like my content and you haven't already, please consider subscribing to stay up to date with my latest videos ⤵️ ru-vid.com...
🎧 I also co-host a Foxbody/automotive related podcast called: “Rollin in my 5.0” We upload a new Podcast episode every Monday morning. Our Podcast can be found on both Spotify and Apple Podcasts at the links below:
Apple Podcast:
podcasts.apple.com/ca/podcast...
Spotify Podcast:
open.spotify.com/show/5OI5X0U...
I upload new videos every Tuesday @ 12:00PM PST (3:00PM EST); and periodically I upload short clips throughout the week.
✅ Check out my Instagram channels for more up to date footage, videos and pictures of my Foxbody Mustang and other projects we are working on in the shop:
/ 92lx5.0
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@92LX5.0
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Thanks for Watching!
#foxbody #foxbodymustang #heatercore
*Please attempt any and all modifications and automotive endeavours discussed on this channel at your own risk*

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23 май 2022

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Комментарии : 71

@blueknights7576 2 года назад

What a nightmare!! Dreaded having to do this repair within the first month of getting my fox. Great video as always brother! And for those that don’t make the same mistake I did, do not forget the flow restrictor that goes into the inlet tube when replacing their heater core…hopefully that saves someone the headache that I had to deal with.

@KASLCustoms 2 года назад

Thx buddy! Well said. I’m posting this to the top of the comments 👍

@dianeoneill5442 2 года назад

Love to have you around my leak o. My heater core was mild

@jasonthompson8479 2 года назад

I have done a number of heater cores. Not too bad after the first 2 (learning curve). I live in Nova Scotia, Canada. I have been listening to your podcasts with Chris since day one. First one, I remember I was up on a ladder 20 feet in the air changing a light fixture on my house and it was - 8 degrees and snowing. The most recent one, I was outside again doing yard work. You guys are a HOOT! The neighbors must think I am crazy or wonder who I am listening to as I was not using ear buds. HAHA So, I also have blue blood. My dad went to work at a Ford dealership when he was 17 and he is 73 and is still there as parts manager. My brother works there with him in parts. I also had worked there for a number of years in parts and ten years as a technician. My family has all had foxbody mustangs (even my mother) and we still have foxbodies to this day. My dad has a VORTECH supercharged 2008 BULLITT. My brother has a 1988 hatchback 5.0L 5 speed and a 1999 GT. My sister has a 2001 BULLITT and a 1987 GT. I currently have a 2013 GT and a PAXTON supercharged 1990 GT (which I owned since 1994). I just recently picked up my first set of RECARO seats (I know Chris likes seats!) ... but it came with a Ford Performance Focus ST Stage 3 going to be my daily driver. Keep doing the podcasts and we enthusiasts will keep on listening. CHEERS.

@KASLCustoms 2 года назад

Wow buddy - thanks so much for sharing!!! I love that you’re enjoying the pod. Thank you SO MUCH for the kind words and all of your support! You’re not kidding about having “blue in your blood!” That’s one heck of a family line up of cars. We’ve got a good one coming up this Monday that I think you’re going to like 😉😂👊. Thank you once again for taking the time. Take care my friend!

@jasonthompson8479 2 года назад

@@KASLCustoms looking forward to it.

@timothysivyer4996 Год назад

Awesome info just found coolant on my passenger side floorboard and right away thought of the heater core just gonna do the easy fix and put in the bypass great info on letting me no i needed the 3/4 and 5/8 ends thanks man!

@KASLCustoms Год назад

Ah that sucks pal but glad I could be of assistance 👌

@lloydgreen4091 2 года назад

*Thanks for the Link,* having the right part for the Two different sizes alleviates a lot of headaches down the road. LS parts on a Stallion though? Heck my "voting for Ol' Joe" theory still could be correct. lol lol

@KASLCustoms 2 года назад

🤣🤣🤣👊👍👌

@jeffcarroll6346 2 года назад

Awesome video man. Nice bypass and only downside is no heat - but a vert fox summer driver doesn’t need any heat. Haha.

@KASLCustoms 2 года назад

Thx buddy!!! Hahaha you betcha

@91LX 2 года назад

I thought you were going to say you had a bad water pump. Last week we had to try 3 of them before we got one that didn’t leak. Great video as always and your podcast is awesome.

@KASLCustoms 2 года назад

Oh wow - that’s terrible. Just poor quality in parts you think? Thanks so much my friend. Really appreciate the kind words 🙏🙏🙏

@dntlss 2 месяца назад

Unless you live in Alaska or Buffalo or any of those places you can survive fine without a heater core,it gets cold where i live during winter but its mainly high 30s and then next day it will be 70 then 16 the next day,lol,just keep a nice clean towel out back and when your windshield start getting fogged up just wipe it down,works fine. I scored a original Ford heater core for my 91 in the original box (you are more apt to find a sewing needle in the middle of the Atlantic ocean than one of these cores,lol) ,i keep the core in my safe, only thing stopping me from changing it is that my dash is cracked in a few places and i want to replace it when i do my core,reproduction cores are worthless. Good quality dashes (used or new) are another sewing needle item, ive actually seen a new dash in a box,i thought i would go blind after that,seeing forbidden things and all that,lol, but the guy wanted too much and it wasn't the right color, love your channel man,been subscribed for a long time.

@KASLCustoms 2 месяца назад

Thanks buddy!

@duncster15 Месяц назад

since the oem’s fail, why put another one back in?

@ogsuperflygarage 2 года назад

Great video Brother! All said…it is a quick job and easy fix. 💯👊🏾 I guess the drawback to bypassing it would be no heat in the Fox.🥶 That is until you boldly took on the task and earned your right of passage badge.😀

@KASLCustoms 2 года назад

Hahahaha so true bud!!! Hope you’re keeping well 👍

@ogsuperflygarage 2 года назад

@@KASLCustoms So far so good Bro! Family and I doing good. Hope all is good with you and your family! 😊

@KASLCustoms 2 года назад

Good to hear pal. We’re great too thx 💚

@GearHead704 Год назад

Doing this bypass today myself

@KASLCustoms Год назад

Nice!!!

@duncster15 Месяц назад

great vid. thx

@duncster15 Месяц назад

are the aftermarket cores more robust than the POS oem?

@KASLCustoms Месяц назад

NPD apparently sells copper core replacements 👍

@_Livid_ 2 года назад

I’ve always pulled the front seat and changed the heater core laying upside down inside the vehicle. Beats pulling the whole dash. Unfortunately I’ve had to do it a couple times now. It’s never fun no matter what approach you take. Next time I’m bypassing.

@KASLCustoms 2 года назад

🤣🤣🤣 so true!

@Neffboy15 Год назад

How did you remove it from under the dash? I have a 4 eye fox and it looks possible to replace it without removing it.

@dntlss 2 месяца назад

@@Neffboy15He must be talking about a 50s model car,lol, you ain't getting this heater core out from top, bottom left or right,dash removal required,on some 79 to 93 Mustangs that didn't come with A/C getting the heater core out is a bit easier because the box is smaller and more easy to get to, maybe thats what hes talking about.

@lekenjeken9985 Год назад

Very very common issue with the fox, happened with my 85 tbird, now its happening with my 89 gt

@KASLCustoms Год назад

Yep so true!

@mattk3035 5 месяцев назад

I still smell coolant strongly in the car but only when i run the fan and i already have the heater core bypassed, its been bypassed a year. Is that just from the remaining coolant that maybe left dried in to the carpet even though I only smell it when the fan is on? Or maybe a head gasket leak? Even thought at this point i don't seem to be getting low on coolant but haven't driving it but maybe 50 miles this year. I need to check the oil but no overheating or white smoke out the pipes either.

@KASLCustoms 5 месяцев назад

Its probably just left over in the heater box and/or carpet

@mattk3035 5 месяцев назад

@@KASLCustoms how long would it last in the heater box? Maybe I need to just let the fan run a long time? I've never let run for more than like 10 seconds because it smells so strong. I have the new heater core just need to find time to replace it. I guess after that if I still smell it then it's probably still a head gasket leak? Because there's no smell of it at all until I turn the fan on. Even if I sit on the passenger side, I can't smell anything til the fan is on and then it's too strong to keep going.

@alvaropimentel779 Год назад

Found it🎉

@KASLCustoms Год назад

Nice!

@devinmenchaca9965 8 месяцев назад

I definitely need to find this hose my just done the same thing any tips anyone I can’t find it

@KASLCustoms 8 месяцев назад

I listed where you can get it in the description of the video

@gunner8129 2 года назад

Hey bro I have an 87 Ford Mustang Fox body with the 347 Stroker and a T5 transmission I replaced every part around the transmission new clutch new flywheel new throwout bearing new throwout bearing retainer pilot bearing all kinds of stuff down there took it for a ride and was extremely easy on the car considering all the parts I put in it when I parked and noticed tranny fluid under the car so I looked obviously and behind the tranny mount it cracked the case to the transmission Halfway Around the trainee why would this happen I'm not sure if you could give me some ideas on why this would happen I would really appreciate it thank you

@KASLCustoms 2 года назад

Hey pal. Sorry to hear that. That’s pretty crazy…? Maybe the trans case was already cracked and when you removed it you opened it up? That’s about all I can think of. I’m not sure how it would crack during R&R 🤷‍♂️

@gunner8129 2 года назад

@@KASLCustoms sorry I've been busy as u no taking transmission out again and buy newer one to put in so is what happened and ear where one of the bolts go into the bellhousing from the training broke off the training I had taken it to a welder to get it welded and I'm not wondering if he didn't drop it but he was an older guy but maybe there was just a hairline in it anyways I don't know I know I didn't see it when I put it in but I went for a five-minute ride and parked and saw the tranny fluid dripping from the bottom of it it cracked on the side in between the driveshaft and the transmission mount and there's no pressure right there so I'm not really understanding what happened but thanks for your response take care stay safe

@KASLCustoms 2 года назад

That sucks buddy. Thanks for the update and I hope you get it all settled 👊

@dntlss 2 месяца назад

@@gunner8129Use commas sometimes man,i was trying to read your post but gave up,lol

@ericridout61 2 года назад

The gong show is when someone talks you client into dumping a bunch sealer in the system to plug the hole in the heater core !!

@KASLCustoms 2 года назад

🤣🤣👌

@Mattys91gt Год назад

what about bypassing the EGR coolant lines and putting them together or keep them on the egr

@KASLCustoms Год назад

You definitely could but I would only consider it if you deleted your EGR

@Mattys91gt Год назад

@@KASLCustoms what happens if I have the EGR on still I have the block off plate and the resistors to make a plug to trick the CPU but I haven't tried to make it yet

@KASLCustoms Год назад

Sorry I’m not sure I understand the question?

@Mattys91gt Год назад

@@KASLCustoms if I run the EGR with no coolant lines what's the negative effect on the car

@KASLCustoms Год назад

It’s a long story but the short version is: The gases being introduced through the EGR are hot - which are only good to have upon cold start situations. The coolant running through your throttle body/egr spacer are to cool that area during normal running conditions because you want the air going into your engine to be as cold as possible for both power and efficiency

@survivethrive2468 Год назад

Hey buddy hope all is well aye! I have developed a weird coolant leak near the back of my passenger side upper head area dripping down on the starter between the engine block and transmission on my 1988 lx vert 😔 go figure now after my fox is back together after doing the AOD to T5 swap and new radiator. What in the hell would u suspect the leak to be? I only notice the drips after car sits overnight after a drive. The car doesn't run hot or overheat no smoke from tail pipes and no coolant in the oil. I don't smell any coolant from inside the car or see any fluid from the hole on firewall. I'm fearing the worse but really stumped!😭🙈. Any thoughts be much appreciated as I finally got my car running after 5 weeks on jack stands. Much respect from down here in the states in Maryland... drink a Labatt blue for me! Haha. Cheers 🍻

@KASLCustoms Год назад

Hey pal! That sucks… I would guess either it’s coming from your egr spacer near the throttle body or it may even be the dreaded heater core… check those two spots and let me know

@survivethrive2468 Год назад

@@KASLCustoms hey buddy I rented a coolant pressure tester today and pumped up to 16 psi. Welp I went to look at back of upper intake and the egr coolant hose that goes from throttle body down to lower intake side was leaking near back of intake and running down leaking. I pulled the upper intake and noticed Holly shit! There is no clamp on the end of that hose that slides over the nipple of that fitting... so I'm hoping I get lucky. What a gong show to have to pull the upper intake. Rather be shot or have bleach poured in my pee hole 😂 haha. Cheers 🍻 aye! I could drink a Case of Labatt blue after today. At least it doesn't appear to be the heater core thank God!!!!!!!!!!

@KASLCustoms Год назад

Hahahahahahahaha! Good thinking! Like you said, you may have “dodged a bullet” 👍

@dntlss 2 месяца назад

@@survivethrive2468bleach poured over your pee hole over a upper intake? i take mine out on my 91 vert in 5 minutes,thats taking my time,lol , i think you meant the lower, lower is a bitch.

@dianeoneill5442 2 года назад

Happen to me a few months ago my son bypass it also had my mustang 14 yrs 1992 a tuff job found someone fir 600.00 at my house haven’t done it yet .

@KASLCustoms 2 года назад

Yeah, it’s a very labour intensive job to fix properly 😩