Question about 1999 Pontiac Grand Am GT

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My car has been over heating and iv changed radiator heater core and thermosthat what else could it be

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Pressure test the system and check for a blown head-gasket. VERY common with these motors. If there is any other coolant leak (outside the motor), the pressure test will allow you to locate the leak. Do you have problems starting the car after it's been sitting for awhile?? If so, then you have coolant leaking into your spark plug tubes and you'll have to press your foot all the way down on gas pedal in order to blow the coolant out. If you don't have a coolant system pressure tester, stop by a local shop and see what they'll charge or get one at o'reilly's or napa for a tester (not a fancy one).

Posted on Feb 05, 2010

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Bad cooling fans, not comming on or bad water pump

Posted on Feb 05, 2010

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2 Answers

I changed the thermostat but it still does not heat up what else could be wrong


Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.

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Bad coolant flow. check for low coolant, also a thermostat could be restricting proper coolant flow. If coolant is full in the radiator than touch your upper radiator hose to see if it is hot. If their is proper coolant level and engine is warmed up to temp and radiator hose is cold replace your thermostat.

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Sounds like you have a clogged heater core. Sometimes heater cores can be flushed, but more times than not, it has to be replaced. If you've replaced the thermostat and your lower radiator hose is always cold, chances are it is the heater core. Hope this helps! Have a great day!

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