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Dexcool compatibilty #4808117
07/08/18 07:02 AM
07/08/18 07:02 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
I'm having continual problems with leaking and failing plastic heater core quick connects on a 06 Escalade. I want to get rid of the plastic and use metal tees and hoses. Are there any metals I should not use with dexcool?


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: LeakySeals] #4808150
07/08/18 07:37 AM
07/08/18 07:37 AM
Joined: Mar 2013
Posts: 4,790
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,790
The Midwest
Have you replaced your radiator cap? Maybe you have a defective one that lets too much PSI build in the system.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: Dexcool compatibilty [Re: LeakySeals] #4808153
07/08/18 07:40 AM
07/08/18 07:40 AM
Joined: Dec 2006
Posts: 8,368
Illinois
mrsilv04 Offline
mrsilv04  Offline
Joined: Dec 2006
Posts: 8,368
Illinois
Are the heater hoses too long or too short, or routed wrong, and are putting too much stress on the quick connects?


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: Dexcool compatibilty [Re: LeakySeals] #4808161
07/08/18 07:54 AM
07/08/18 07:54 AM
Joined: Apr 2017
Posts: 977
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 977
SF BAY AREA, CA
If you use the Dorman junk from the parts store they will fail again.


2007 Crown Vic P71 4.6 ~127K Miles, RP HPS 5W-30, RP 20-820.
2010 Escape FWD 2.5 ~90K Miles, Castrol Edge EP 5W-30, Wix 51348.
Re: Dexcool compatibilty [Re: skyactiv] #4808169
07/08/18 08:11 AM
07/08/18 08:11 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
Originally Posted By: skyactiv
Have you replaced your radiator cap? Maybe you have a defective one that lets too much PSI build in the system.

Don't have one. The gauges say everything is normal. A little under 215.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: mrsilv04] #4808170
07/08/18 08:13 AM
07/08/18 08:13 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
Originally Posted By: mrsilv04
Are the heater hoses too long or too short, or routed wrong, and are putting too much stress on the quick connects?

Well it's the factory set up which routes along the engine cover. There isn't much play. And it's difficult to put the engine covers on and off without taking everything off. I do wonder if the engine flexing is slowly wearing these things out. Another reason to change the configuration to metal and a bit longer hoses rerouted away from the engine


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: dogememe] #4808175
07/08/18 08:19 AM
07/08/18 08:19 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
Originally Posted By: dogememe
If you use the Dorman junk from the parts store they will fail again.

I think you might be right. Each one of these failures has been a catastrophic emergency on the side of the highway sending me into the parts store for the Dormans. I've taken videos of them just wiggling loosely on the ends of the heater core pipes. When these things fail they are a catastrophe if it's on the highway. It's just not worth playing games with plastic heating core quick connects anymore. They don't quick disconnect. They are a pain. I just want to put on metal and hoses and be done with it. Those things can ruin your vacation and destroy your engine in a matter of minutes


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: LeakySeals] #4808180
07/08/18 08:23 AM
07/08/18 08:23 AM
Joined: Dec 2002
Posts: 42,088
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,088
New Jersey
Originally Posted By: LeakySeals
Originally Posted By: dogememe
If you use the Dorman junk from the parts store they will fail again.

I think you might be right. Each one of these failures has been a catastrophic emergency on the side of the highway sending me into the parts store for the Dormans. I've taken videos of them just wiggling loosely on the ends of the heater core pipes. When these things fail they are a catastrophe if it's on the highway. It's just not worth playing games with plastic heating core quick connects anymore. They don't quick disconnect. They are a pain. I just want to put on metal and hoses and be done with it. Those things can ruin your vacation and destroy your engine in a matter of minutes


So what metal and hose do you intend to use instead? Dorman or equivalent junk?

Get the OE parts, hurt once, and move on.

Even my nearly 40 year old Mercedes cars have plastic radiators and they are original.

Re: Dexcool compatibilty [Re: LeakySeals] #4808181
07/08/18 08:23 AM
07/08/18 08:23 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
This is a six-month-old Dorman. Everything was fine suddenly a catastrophic loss of coolant on the highway. It just broke in two.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: JHZR2] #4808183
07/08/18 08:31 AM
07/08/18 08:31 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
Originally Posted By: JHZR2
Originally Posted By: LeakySeals
Originally Posted By: dogememe
If you use the Dorman junk from the parts store they will fail again.

I think you might be right. Each one of these failures has been a catastrophic emergency on the side of the highway sending me into the parts store for the Dormans. I've taken videos of them just wiggling loosely on the ends of the heater core pipes. When these things fail they are a catastrophe if it's on the highway. It's just not worth playing games with plastic heating core quick connects anymore. They don't quick disconnect. They are a pain. I just want to put on metal and hoses and be done with it. Those things can ruin your vacation and destroy your engine in a matter of minutes


So what metal and hose do you intend to use instead? Dorman or equivalent junk?

Get the OE parts, hurt once, and move on.

Even my nearly 40 year old Mercedes cars have plastic radiators and they are original.

GM plastic heater hose quick connects are a known weak spot. It was a bad idea and everyone with a GM truck knows it and will be dealing with the problem sooner or later. In my case it was so bad I'm not even using the truck right now until I come up with another solution that isn't plastic.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: LeakySeals] #4808191
07/08/18 08:40 AM
07/08/18 08:40 AM
Joined: May 2005
Posts: 483
Idaho
sprite1741 Offline
sprite1741  Offline
Joined: May 2005
Posts: 483
Idaho
Plastic, heat and age are the problem. Unfortunately they (manufacturers) all use it. 12 years and my radiators fail like clockwork. It's always the plastic. The last time the Dodge went the plastic tank split open and gushed hot coolant everywhere.


2005 Grand Prix GXP 5.3L Supertech Syn Dexos 5w30 Fram Ultra 3506
1986 Dodge Lancer 2.2L Turbo, Chevron Supreme 10w30 Fram Ultra 3614
Re: Dexcool compatibilty [Re: LeakySeals] #4808192
07/08/18 08:48 AM
07/08/18 08:48 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
I know why they did it. Because the heating core hoses get in the way when you're working on the engine or putting the engine covers back on. In theory it's easy to snap them off and get them out of the way. Well anyone that has dealt with them knows that it's not easy. Doesn't matter I don't need or want weak spot in the cooling system getting me towed on vacation. I want some type of metal tee with rubber hoses. Like the good old days. I'm just not sure which metals are compatible with Dexcool and which are not. I'm assuming aluminum is. But I don't know about brass or Steel


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Dexcool compatibilty [Re: LeakySeals] #4808199
07/08/18 09:00 AM
07/08/18 09:00 AM
Joined: Jun 2003
Posts: 17,379
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,379
Deplorable in apple valley, ca
I cut those off,remove them then use a new piece of heater hos and slip it past the Barb then clamp it with a hose clamp. Elimating those problematic plastic fittings


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Dexcool compatibilty [Re: LeakySeals] #4808200
07/08/18 09:03 AM
07/08/18 09:03 AM
Joined: May 2012
Posts: 1,400
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,400
Georgia
Anything but pot metal should be fine. I had to extract quite a few of the old metal quick connects on 5.7 intake manifolds. If the manifold was off it was easiest to just chisel out the remains.

Re: Dexcool compatibilty [Re: Chris142] #4808255
07/08/18 10:41 AM
07/08/18 10:41 AM
Joined: Feb 2011
Posts: 6,719
Hudson, NH
LeakySeals Offline OP
LeakySeals  Offline OP
Joined: Feb 2011
Posts: 6,719
Hudson, NH
Originally Posted By: Chris142
I cut those off,remove them then use a new piece of heater hos and slip it past the Barb then clamp it with a hose clamp. Elimating those problematic plastic fittings

I have rear heat so I think I need a tee? If there was a way to just use hoses I would do that.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
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