Gm coolant the pink stuff is notorious for creating blockage severely flush the system use a radiator and coolant system flush product from local parts store, follow directions replace with green coolant. plus youll want to check the intake make sure the gasket hasnt let go have replace two because of coolant blockage major job approx 12 hrs so is expensive, done this on a 2000 alero with 127,000 miles and a 2002 with 60,000 miles. ps the intake gasket usually lets go at the left side youll need a flash light. Hope this helps
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