Question about 2002 Pontiac Grand Prix

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Car is overheating even with new thermostat

Resently replaced transmission 3 months ago, now the car is overheating the dual fans will not turn on when reaching temperatures over 210. The has 96,875 miles on it.

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These cars have relays for the fans, replace relays and the fuses. if still dnt work, replace the temperature sensor. make sure u check the wiring, it may just b a loose wire.

Posted on Aug 08, 2008

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210 to 225 are the normal temps for this car. Low speed fans come on at 210 degrees, high speed is 225. If the don't come on. Pull the fuse and relays. Check the fuse and put them all back in. (Corrosion) Turn the A/C on. the high speed fans will/should come on. After this, it has to be on a scanner. to see what is wrong.

Posted on Apr 22, 2015

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Did you bleed the air out of the system? There is a bleed screw should be painted blue. Wait till engine cools and then crank engine. Once engine is started then bleed air out of system thru bleed screw. This should solve your problem. I had exactly the same problem as you and thats all it took to resolve.

Posted on Apr 22, 2015

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Fan not working?, Try this procedure:

  • Dirt and debris can get lodged in the radiator air flow paths. This can block the radiator and cause your engine to overheat and damage the engine.

  • The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

  • Make sure the radiator and the overflow bottle are filled to the proper levels.

  • Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

  • Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

  • Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Posted on Apr 18, 2015

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Find the fan switch and jump it, see if they turn on (Key must Be On) if they do its a bad switch, if not alot more diagnosing.


Don

Posted on Jul 30, 2008

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