Question about Pontiac Grand Prix
First make sure the cooling system is not low on coolant.This will cause cold air to come out with the heat on and on hot.I don`t know what year or type of Pontiac you have.You should always post make model and engine size.This makes it easier to know exactly what problem you could be having.The more information the better.If it is low then the other thing you have to do is pressure test the cooling system to find out where it is leaking.You could also have a bad thermostat ,temp door not working,head gasket out.Please post back with this info if possible and I`ll help you figure out what is causing your problem.Hope this helps.Good luck.
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
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