Question about 2006 Chevrolet Silverado 1500 2WD

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Engine Coolant Hot Message Noticed AC was blowing hot and looked at instrument panel and saw message above. Drove short ways and an individual tried to loosen cap, of course hot coolant went everywhere. Could not see any collasped hoses, filled bottle back up and could not see any leaks. Had to drive another 3 miles and as I approached my destination temp indicator had returned to normal temp. Repalced the thermostat, truck still indicating hot, Could it be the water pump?

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I wouldn't think it would be the water pump mostly because they will either start to get noisy, pour coolant out of the seep hole or completely seize all of which you would probably notice. My guess would be that you have air in the system that may be causing the thermostat to remain closed or possibly a bad radiator cap and/or faulty fan clutch (usually when they "fail" they stay engaged all the time but it is worth inspecting. I was taught to ALWAYS drill a small bypass hole in the rim of ANY thermostat I replace. It helps to gradually open the thermostat during warm up and if the thermostat fails to open, there is still a passage for coolant to flow. This is a must for any GM vehicle.

Posted on May 09, 2010

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