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My 2000 Pontiac Grand Prix was recalled last year because of DexCool. The dealer put tablets in the coolant to stop leaks in addition to installing a new intake manifold gasket (the second time). My car currently has 42,000 miles on it. Now I've notice my car isn't heating up very well this winter. I'm thinking that the heater core is getting clogged. I'm beginning to think my 3800 isn't going to go past another 20,000 miles before I have significant engine problems. It's really gotten course sounding at idle and the idle hunts up and down slightly when I sit in traffic for long periods.
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