Question about 2002 Pontiac Grand Am

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2002 grand-am 4.3 ltr sometimes when stopped in traffic temp goes up on guage but when start moving again temp goes back to normal, could this be a thermastat problem or a cooling fan /sensor problem and how could i check? or any suggestions????

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  • Pontiac Master
  • 2,122 Answers

Hi Tommy, Try carrying out the following tests and observe the results. Open the hood (bonnet) and start the engine, let it warm up until it reaches normal operating temperature. Observe if the electric cooling fan cuts in at the required setting. If the fan fails to start you have your problem. The failure may be due to a defective sender unit, a defective relay or a defective fan motor. If it starts but rotates slowly it may not have sufficient cooling action. If it runs normally check to see if the radiator cap is emitting steam (leaking) If it is, replace it. If the vehicle has been in use for some time, a cooling system flush may be required. It is unlikely to be a problem connected with the thermostat as the thermostat is a thermo mechanical devise, which either allows sufficient coolant to pass or does not. It is not impossible that it is defective but unlikely. Other causes for changes in coolant temperature can be caused by incorrect ignition or valve timing. Valve timing can have changed because of stretched timing belt or chain or a gear which has jumped. It could also be a fault with the gauge circuitry. I hope that this info has been of help. Regards John

Posted on Feb 17, 2012

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Posted on Jan 02, 2017

saberwolf67
  • 21 Answers

SOURCE: Temp Guage Rises While in Traffic Stop and Go

it seems to me that your fan is not working properly ,check the relay first you might get lucky.if not i would start looking for a bad connection or in replacing the fan

Posted on Nov 23, 2008

emissionwiz
  • 75822 Answers

SOURCE: Temp guage dont read

U are talking about two different sending units, one is the Engine Coolant Temp sensor, the other is the temp guage sender, sounds like you have a bad thermostat, if the engine doesn't reach the proper operating temp it will set a code for the engine coolant temp sensor, and the guage will not move or move very little, replace your thermostat and both problems will go away.

Posted on Mar 02, 2009

  • 226 Answers

SOURCE: 2002 Pontiac Grnad AM. Engine temp at 200. Air

Most likely a bad water pump and/or low coolant level

Posted on Feb 24, 2010

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