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Thread: where is the heater control valve??

  1. #1
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    where is the heater control valve??

    for some reason my heater wont turn off. i have tryed evrything to try and stop it. I've talked to several people and they all said that its the heater control valve is stuck. well i try'd to find it and i cant. my haynes guide said that it should be connected hoses going to the heater core. well its not ther the book even showed a picture. i need help and advice cause it gets extremely hot in my truck.

  2. #2
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    What year and model?
    1994 white ext cab chevy silverado 5.7 rolling 230k miles
    stock with air filter lid flipped,
    open flowing exhaust to a 40 series flowmaster dumped.
    God Bless America, Support our Troops!

  3. #3
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    Its a 1995 gmc sierra 1500 4x4 x-cab with 253000 miles on it

  4. #4
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    Your mode door motor may be stuck on hot, if you still have the old style interior, to get to the mode door motor, remove the glove liner, and down left is the mode door motor, it will cost about 100 bucks to replace it. On the dash the temp selection, does it flash arrows if you try to move the temp to cool?
    1994 white ext cab chevy silverado 5.7 rolling 230k miles
    stock with air filter lid flipped,
    open flowing exhaust to a 40 series flowmaster dumped.
    God Bless America, Support our Troops!

  5. #5
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    I have the newer interior. There are no arrows flashing when i move the temp to cool

  6. #6
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    Ok should still be in same location, I don't know how to get to it, but you might be able to feel around for it, should be in the middle of under the dash on the air box.
    1994 white ext cab chevy silverado 5.7 rolling 230k miles
    stock with air filter lid flipped,
    open flowing exhaust to a 40 series flowmaster dumped.
    God Bless America, Support our Troops!

  7. #7
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    You can loosen the heater hoses under the hood, run one back to the water pump, and the other to the firewall, this will stop the heat until you figure it out, you can even buy a valve at a hardware store, cut the hose and clamp in the valve. just leave closed all summer, then open for winter, of course I hope you fix the original before that much time passes!Name:  HeatBypass.jpg
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  8. #8
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    Check out this pix

    click on pix



    Name:  HeatBypass.jpg
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  9. #9
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    Quote Originally Posted by Rodys95Z71 View Post
    for some reason my heater wont turn off. i have tryed evrything to try and stop it. I've talked to several people and they all said that its the heater control valve is stuck. well i try'd to find it and i cant. my haynes guide said that it should be connected hoses going to the heater core. well its not ther the book even showed a picture. i need help and advice cause it gets extremely hot in my truck.
    skip down to photo it may help for temp fix

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