Question about Pontiac Grand Prix

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My 2005 pontiac grand prix was overheating and was leaking water out of the jug so I put a thermastat in it . And it still was overheating so I flushed the radiator and it was still overheating,then I noticed my fans wewe not coming on until the temp was fairly high could It be engine temp censur or relay to fans

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Most likely it is a combination problem involving the water pump. The temp sensor being slow to respond being the problem would be easily identified. If the vehicle is over heating when you are moving and 30 to 40 mph it is not a sensor or Fan. It could possibly still be the fan if the fan clutches are not working and allowing it to free spin as air moves faster through the Radiator but this is less likely than a bad water pump.

Posted on Sep 15, 2010

  • jdmean Sep 17, 2010

    It was the coolant temp sensor on the bottom of the thermastat. replaced it and the car is staying cool

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