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GM Plastic Heater Hose T-Fitting(s) Broke! #5388202 03/28/20 06:26 PM
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jetman Offline OP
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GM Plastic Heater Hose T-Fitting(s) Broke!

It's not if, it's when. Well it happen to my 07 GMC Yukon(152k miles) while driving on a local hwy about 8 miles from home. By the time I got it pulled over(2 min) to a suitable place the engine was getting mighty HOT. With the help of a local neighbor & friend, I patched it up good enough to drive it home where I did a proper repair.

I installed a pair of GruvenParts.com billet aluminum GM heater core tees, silicone hoses, & worm clamps. What a PIA.

While I was at it I also replaced the 2 into1 heat hose with Y-fitting with a Dorman 626-553 that has a metal Y in it. Most replacements have a plastic Y. NAPA also sells it under pt# 827-5730-1. Also, replaced w/new many other coolant hoses, coolant, and water pump.

I hope this helps.

[Linked Image]
[Linked Image]
[Linked Image]


Last edited by jetman; 03/28/20 06:29 PM.

Fulltime DIYer, retired pilot
12 MKX 3.7
07 Yukon 6.2
07 Toyota FJ 4.0
96 Prevost XL40 12.7
51 Chevy 5w PU Resto 5.3
92 TopSportsman Firebird w/604
241" 4link Dragster w/565
83 Glasair! TD
90 Ez-Go 2-cysle GC
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388219 03/28/20 06:57 PM
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Chris142 Offline
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Only thing I see wrong is that you should not use worm clamps on silicone hose.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388233 03/28/20 07:12 PM
Joined: Jan 2003
Posts: 3,445
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edwardh1 Offline
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do all trucks have a "mess" of heater hoses like this? seems lots of joints

Last edited by edwardh1; 03/28/20 07:12 PM.

These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388238 03/28/20 07:24 PM
Joined: Jul 2013
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jhellwig Online Content
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Posts: 2,052
Suburban and Tahoe’s have rear heat so they have to have a tee for the rear core. The ac is just as bad in them.

I have replaced most of them on my 95. Luckily on it the tees are all steel so I could just shove the hose on them.

Last edited by jhellwig; 03/28/20 07:25 PM.

Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388240 03/28/20 07:26 PM
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Cujet Offline
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Been there, done that. It's not a pleasant job.

Your repair looks good and should hold up just fine. Many people don't realize that these plastic parts have a finite life. They probably should be replaced at the 10 year mark.

Last edited by Cujet; 03/28/20 07:28 PM.

People who count on their fingers should maintain a discreet silence.
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: Cujet] #5388250 03/28/20 07:34 PM
Joined: Sep 2010
Posts: 12,834
4WD Offline
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Indeed … at 100k I changed a bunch of the famous plastic on the Cruze …
none of it cost much and none of it hard to do … But bad day if you wait

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388436 03/29/20 07:30 AM
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Olas Offline
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aluminium flanges used to be common in the old days, I have all aluminium flanges on my car.

the modern pastic alternative is cheaper but also siginificantly more fragile.

I think we all know that metal > plastic

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388437 03/29/20 07:42 AM
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NYEngineer Offline
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Last April I replaced all of those parts on my 09 Suburban as well. I also used that aluminum Y. I replaced all of the plastic parts with new OEM plastic parts. Those Tees are nice. Shoulda done it that way.
That was a fairly miserable job.

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388456 03/29/20 08:38 AM
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Lubener Offline
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Drunken engineers at GM. I have seen more idiotic ideas with GM. Don't know what they were thinking. From plastic elbows to coolant tee's and fittings.

Last edited by Lubener; 03/29/20 08:39 AM.

The "thinking" man's friend.
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: Lubener] #5388461 03/29/20 08:41 AM
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Olas Offline
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Originally Posted by Lubener
Drunken engineers at GM. I have seen more idiotic ideas with GM. Don't know what they were thinking. From plastic elbows to coolant tee's and fittings.


The engineers at GM are good, it’s the accountants that are drunk on the job!

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388466 03/29/20 08:46 AM
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whatnext Offline
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Similar issue with broken plastic Tees on heater hoses for the Nissan Xterra. Similar fixes.

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: jetman] #5388508 03/29/20 09:42 AM
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Kira Offline
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To Chris142: Why no worm clamps on silicone hoses? What is the correct hose clamp for silicone? Thanks to anyone who answers.

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: Kira] #5388512 03/29/20 09:48 AM
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Wrenchturner44 Offline
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https://www.global-hose.com/silicone-hose-clamps/

Chris is correct. I have seen this mistake on more cars where after market turbos were installed. If you have a track or drag car and use worm gear clamps on the boost hoses, you will be flagged wont be able to race until they are changed out.

"Now you know the rest of the story"

Last edited by Wrenchturner44; 03/29/20 09:49 AM.

2003 Dodge Durango SLT
2013 Dodge Dart SE Rallye
2015 Buick Encore
2015 Chevy Sonic LTZ
Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: Lubener] #5388513 03/29/20 09:54 AM
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4WD Offline
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This didn’t take long … the only company in the world using plastic under the hood

Re: GM Plastic Heater Hose T-Fitting(s) Broke! [Re: 4WD] #5388537 03/29/20 10:23 AM
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kschachn Offline
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Originally Posted by 4WD
This didn’t take long … the only company in the world using plastic under the hood

Oh no there are others. It has everything to do with the type of plastic.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
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