Question about 1989 GMC Sierra

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Don,t throw out much heat.

I replaced the thermostat it worked for awhile. i am working on a 1989 gmc sierra 4x4 350 auto.

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  • jason breen Mar 02, 2009

    yes it was flushed

  • jason breen Mar 02, 2009

    i will check those tomorrow and let you know.



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Have you tried flushing out the heater core with a garden hose?

Posted on Mar 02, 2009

  • Clint Smock
    Clint Smock Mar 02, 2009

    Is the return hose going to the radiator tank hot? If it is it might be a temp door problem in the dash. If the hose isn't hot it might be a water pump.

  • Clint Smock
    Clint Smock Mar 02, 2009




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be more specific,head unit could mean cylinder head/s could mean thermostat unit,were the hoses hooked up right? thermostat should be checked before installing,very easy to do could be stuck shut.was the heater core checked or flushed out?lots of maybys,wish it was in my garage..

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