Question about Pontiac Grand Prix
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
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Posted on Jan 02, 2017
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