Indicates a head gasket problem
at idle the gasket is sealing but under load is allowing compression into water jacket
do a compression test
check cat converter for failure blocking exhaust
run fault codes to check for mixture control problems
SOURCE: 1999 Pontiac Grand Am Overheating
It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.
SOURCE: heat fluctuation on temp gauge
change the sending unit to the fan, if that doesnt work check for power too the fan or even a bad fan
SOURCE: 2004 Pontiac Grand Prix OVERHEATING!!!
Have you shop perform a "leakdown test." You probably have a bad head gasket )or a leak in the gasket).
SOURCE: 2001 Pontiac Grand Prix...overheating. Changed
Did you bleed the radiator after refilling because it sure sounds like you have an air lock in there.
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