Question about 2002 Pontiac Grand Am
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
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
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
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