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Hmmm... I had a bad water pump seal (leaking ) and near-radiator overheating with my '98 GTP at around the 40,000 mile mark myself, and yes, the mechanic said the Dextcool was the problem, but this doesn't make sense.
Why would GM claim no radiator change upto 100,000 miles if this was the case (under normal driving conditions-which I am)??
My theory is what others are saying: That either the mechanics are topping off the Dexcool with other AFreeze and it doesn't mix well or (my theory)- At routine oil changes, some nonattentive mechanic mistakenly mixes the WS washer solution in the fill reservoir of the AFreeze tank and doesn't mix as well! All I know, is I had an almost paper-like whitish gunk in my AF reservoir.
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