Question about 1990 Chevrolet K1500

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Heater wont work in my 1990 Chevy Truck

My heater in my 1990 Chevy truck only blows cold air.

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  • griselda_bar
    griselda_bar Dec 27, 2008

    Where can I locate the coolant valve nd where do I locate the damper in duct?

  • Anonymous Feb 14, 2009

    I have a 1995 Chevy Tahoe 350 and I cant get the heat to come on. Already replaced the water pump and thermostat, however it is still blowing out cold air. Help!?

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  • Master
  • 405 Answers

Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Posted on Dec 27, 2008

  • 2 more comments 
  • David Johnson
    David Johnson Dec 27, 2008

    Most likely low coolant level, most common problem.

  • David Johnson
    David Johnson Dec 27, 2008

    The heater control valve will be under the hood inbetween the heater core and the engine, probably vacuum operated, and you should be able to see it move it it is working. The damper for the heater a/c is used to deflect the blower air over the correct coil. it will be locate in front of blower in the duct and will be actuated with vacuum, a cable or and electric motor.

  • Chuck Hurley
    Chuck Hurley Dec 11, 2013

    I have a 1991 Chevy 1500 and everytime I turn on or off the truck I hear clicking from the air duct and my heat wont work.

  • Chuck Hurley
    Chuck Hurley Dec 11, 2013

    To finish my question. The hoses to and from the heater core are hot so it's getting the coolant.

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