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That Dex-cool is some nasty stuff. It pretty much writes off any GM product for me at a dealer auction over 15 years old. All I look for is the 3.8, 4.3, and 5.7s out there.
The coolant is not pressurized in the expansion tank reservoir, as the cap can make it easily confused with windshield washer fluid. The ones with old Dex cool in there build up a really nasty gooey coating on all the surfaces. It really is a shame.
My '94 Buick had a nasty looking heater core because of it. I made specific instructions NOT to refill the system with dexcool.
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