coolant - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-05-2004, 03:03 PM   #11
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My personal opinion, if your car does take dex, flush IT ALL OUT, and use green....I've done it before w/ out trouble....Red ur dead...Green ur clean
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Old 10-05-2004, 03:16 PM   #12
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Quote:
Originally Posted by LakevilleSSEi
My personal opinion, if your car does take dex, flush IT ALL OUT, and use green....I've done it before w/ out trouble....Red ur dead...Green ur clean
What'* your basis/motivation for doing this?

I don't see any reason to remove the fluid that GM has designed for our vehicles.
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Old 10-05-2004, 03:29 PM   #13
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The basis and reasoning is that I've seen dozens of cars (including one of my parents cars) dex turn in to a muddy sludge crap. And wreck the motors.....And the stuff likes to eat head gaskets also. Some sort of chemical reaction between the aluminum heads and cast iron block that turns the coolant into acid before the sludge.

*EDIT* GM has also had a couple TSB'* out about this coolant too. They recommend a 150,000 mile flush interval, when the dex starts gettin bad at about 35,000
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Old 10-05-2004, 03:33 PM   #14
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Did they have a flush the radiator with that machine thingy periodically as recommended? Did they have a Series II L36? The L36 are know for that type of failure with the gasket and upper intake.
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Old 10-05-2004, 03:46 PM   #15
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3800'* have iron block/heads.
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Old 10-05-2004, 03:51 PM   #16
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The upper intake gasket failure was nothing coolant related....To my knowledge. From what I know the intake gasket failures were because of the plastic intake on an aluminum (?) lower intake, and they both expand and contract at 2 different rates, so there'* friction on that gasket and it'* wearing them out. Causing coolant to leak into the engine.
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Old 10-05-2004, 03:56 PM   #17
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just by having Dex-Cool coolant?
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Old 10-05-2004, 04:02 PM   #18
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Quote:
Originally Posted by LakevilleSSEi
The basis and reasoning is that I've seen dozens of cars (including one of my parents cars) dex turn in to a muddy sludge crap. And wreck the motors.....And the stuff likes to eat head gaskets also. Some sort of chemical reaction between the aluminum heads and cast iron block that turns the coolant into acid before the sludge.

*EDIT* GM has also had a couple TSB'* out about this coolant too. They recommend a 150,000 mile flush interval, when the dex starts gettin bad at about 35,000
Hmm... I think their issue was the exception not the rule. I am yet to see a DexCool issue in a vehicle that is properly serviced.

DexCool reacts poorly when the fluids aren't topped off. That'* when the cooling system turns to sludge.
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Old 10-05-2004, 04:10 PM   #19
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Just stick with the coolant the car came with. You WILL run into problems later on. Dex and Gly don't get along well.. and they will wreak havic upon your cooling system.


-justin
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Old 10-05-2004, 05:39 PM   #20
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Dex + Gly = Glue if I remember correctly?
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