Question about 2000 Pontiac Grand Am GT

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Pontiac Grand Am SE running hotter than normal

My car has been running hot, but not over heating. When i first got my car, it always ran at a constant 170F. Then one day the gauge rose normally to 170 then kept going to 190/200+ and if the car sat running, it would work its way up to 230ish. If I drove the car around, the temperature would slowly go down 30 to 80 degrees (depending on the ambient temperature). After about 6 months, I changed the coolant which only helped slow the temperature increase, but it would still be a repeat. A few days ago I changed the thermostat (after about a year since the temperature difference happened), I managed to get the air out of the system that I'm aware of, but now it heats up faster (5-10 minutes driving) and holds at 200F to 210. When I drive around, there's little to no effect on the engine temperature. I've tested the old thermostat in boiling water and it opens fine. I changed my oil a few days ago and the oil looked fine. I've given the upper hose a good squeeze and there is pressure when its hot. The heater works fine.

-2000 Pontiac Grand Am SE V6 3400
-New coolant: Prestone (the mix with any color kind). I mixed the water in.

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  • 3 more comments 
  • Rent A Troop May 22, 2009

    I've noticed the cooling fans only come on when the AC is on.

  • Rent A Troop May 30, 2009


  • Rent A Troop Jun 16, 2009

    I took a closer look and the fans do turn on when the car starts to reach higher temperatures. i think its more of a pressure problem. i changed the reservoir tank cap and its having some effect on the temperature, but not much.

  • Rent A Troop Jun 29, 2009

    is the temperature sensor on the water pump?

  • Rent A Troop Jun 29, 2009

    is the temperature sensor on the water pump?


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  • 1,348 Answers

Check the fan switch and make sure the cooling fan is coming on.

Posted on May 22, 2009

  • kirtec auto Jun 16, 2009

    the ac makes the fans come on,that means that the fan switch is no good,if you run the ac does the temp still stay high,if not then the fan is the issue

  • kirtec auto Jun 27, 2009

    there is a temperature sensor that feeds the gauge. get the temperature measured with a thermometer,and see if the gauge is accurate.


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