1999 Pontiac Grand Prix My temperature

Tiny
THOMASSS4321
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 133,000 MILES
I have a 1999 Pontiac Grand Prix GT V6. Everytime I am stopped at a traffic light or stop sign I notice the temperature needle starting to rise slowly, but as I drive off it goes down instantly. I have removed my thermostat completely and drained my radiator many times and refilled it with numerous types of radiator fluid and changed the top hose that goes from the radiator to thermostat and water pump and still no success. It almost goes to the last bar on the gauge, but again as I drive off it goes down. Also my fans do work.
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No
Wednesday, March 24th, 2010 AT 8:03 AM

4 Replies

Tiny
TOOOMANYTOYS
  • MEMBER
Check to see if the cooling fans are operating properly. Good way to see if its the fan motors is to see if both fans work when a.C is on.
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Wednesday, March 24th, 2010 AT 8:17 AM
Tiny
THOMASSS4321
  • MEMBER
Yes they do.
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Wednesday, March 24th, 2010 AT 8:22 AM
Tiny
THOMASSS4321
  • MEMBER
Correction I just tired it now let AC blow for about 5-8min and still fan did not come on but again the car was not warmed up at all it had been off for about 4hours.
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Wednesday, March 24th, 2010 AT 8:58 AM
Tiny
TOOOMANYTOYS
  • MEMBER
It doesnt matter how cold the vehicle is. When its running and you command the a/c on the cooling fan are suppose to come on. Try running the car with a.C on and lightl tap the cooling fan motors. If they come on you may need new motors if not check fuses and relays to fans.
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Wednesday, March 24th, 2010 AT 11:31 AM

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