Question about 1989 Chevrolet C1500

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1990 chevy sub 350 eng runs hot only at idleing,,cools off once m

New water pump,,,new rad,,,,thermosta good,,,,wonder if fan cluth is bad.....if anyone who knows please send me an email.
thank you
luis

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  • Carrol Preble May 11, 2010

    A few things, the fan clutch could be bad, that will really cause problems.



    Air in the system, for some reason cars are vapor locking like crazy, just run the truck with the cap off till you can see the level of the water/antifreeze drop, fill it. then keep doing that till you see that there are no air bubbles in teh system at all.



    and do a pressure check on the system, not only from the radiator, but a compression check to get an idea on teh heads, a slow leak in a line and a head gasket is hard to detect without it, but can cause you serious problems with the overheating,



    get back with me to see if anything was helpfull

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  • Master
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You may want to check the thermostat for the radiator fan. It controls the activation of the fan. It is found on the hose from the radiator. You should see wires to it protruding. To test, try to remove it and see if the fan turns on. If it does not then the fan is the issue. Check out also leaks in the radiator and the hoses.

Posted on Jun 03, 2009

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  • Chevrolet Master
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Could be a fan clutch, or a partially blocked radiator...both will give you those symptoms.

Posted on Jun 03, 2009

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