Question about 1999 Pontiac Grand Am GT

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Running hot I have a 2000 Grand Am GT and it is still running between 215 and 230 degrees fahrenheit after the water pump, thermostat, and head gaskets have been replaced. There are no leaks, and pressure tests have already been done. What could be the problem?

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  • dre123726 May 24, 2009

    The mechanic replaced the thermostat with the proper thermostat for the vehicle, or so I believe he did, and the shop that replaced the head gaskets refilled the system with the proper 50/50 mixture.

    Also, the cooling fans are working properly. I can even hear them running from inside the vehicle, so I guess they are strong.

  • MrRepairAll May 11, 2010

    Thermostats have various ratings. Has the correct one been researched thoroughly?

    Are you using a 50/50 mix of prestone and distilled water?

    Pure prestone can allow it to run hot. THe 50 / 50 mix will help cool it down.

  • its420_us May 11, 2010

    Are the cooling fans working properly?


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Hello, I would check and see if your thermostat is placed in the right position first off. I then would check and see if your radiator has some blockage in it. Try flushing your radiator and this may resolve your heating issue. If it is to blocked you may need to replace your radiator. I would check your temperature sensor fan, your fan clutch or fan control relay. Autozone runs free codes for your vehicle and that can pinpoint your problem normally. I would run a differn't temperature guage to see if your radiator temp is differn't than your gauge in your dash becuase this may be your problem as well just a bad gauge. Have you by chance ever ran any engine stop leak in your vehicle. Your overheating can come from an oil issue as well. First check your oil level and if this is fine you may have a dirty oil pan sump pump screen or your oil pump can be bad as well. Some thermostats from auto stores are faulty and open only partially. You can very carefully put a thermostat in a vice and add heat to see if it opens or not. I would also check and see if your oil filter is clogged. Oil issues can cause overheating as well. If the head gaskets were replaced something may have fallen into your water jackets in your block and they could be trapping coolant. Make sure your antifreeze is mixed 50/50 too. A reference to an auto manual can help troubleshoot exact problems for your vehicle as well. I hope this solves your problem!

Posted on May 24, 2009

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Take a mechanical thermometer and see if it is the same as what is being read from the coolant gauge. The sensor or gauge may be faulty. Check the radiator for clogs or damage to the cooling fins. Check the hoses for kinks or a collapsed area. Check the cooling fan for proper operation. Does it come on at around 210 deg.F. and shut off at 190 deg.f.?

Posted on May 24, 2009

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