Question about 1999 Pontiac Grand Am GT
Bubbling coolant in the overflow tank is a sure sign you have a bad head gasket. The V6 has two heads and accordingly, two head gaskets. It is a lot of work, not something a lady would want to tackle. Factory head gaskets were unconventional on GM V6's, being extruded rather than a one-piece gasket laid in place before the head is installed. The head gasket is there to ensure a good seal for each cylinder for good compression, a good seal for the water jacket so coolant can flow through the heads and engine block (where yours is having a problem, compression is being forced sideways over into the water jacket) and oil supply and drain holes go through the head gasket as well. A backyard mechanic can do this for you cheaper than a big shop or the dealer. If the car is otherwise in good shape and you like it, I'd fix it.
Posted on Mar 25, 2012
You have to change your Heater Core. Your Antifreeze moves in a circular motion from Radiator to Thermostat through engine to your heater core back to your radiator. If there is no circulation, your engine is going to overheat. I had the same problem with my Pontiac Grand Prix.
Posted on Nov 23, 2008
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