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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  • Master
  • 4,669 Answers

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

    o.k.

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