Question about 2000 GMC New Sierra 1500

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Heater in 200 gmc sierra is not workinmg

HEATER IS NOT BLOWIG ANY HEAT,Vehicle is just cold

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  • gb-98 Nov 27, 2008

    I have a 2000 gmc pu 1500 and It does the same thing when I turn on the heat after truck has reached about 195deg it will throw out a little heat for about 5 to 10 seconds, but very little heat at that. i can run around with the heat on all day and it will not throw heat. if it is the heat control or door where are they located and how to check them. thanks

  • Anonymous Jan 18, 2009

    i have the same problem.. the truck will throw out at least 5 to 10 seconds of heat then nothing. i replaced the thermostat and still nothing. can anyone help me?

  • Anonymous Jan 26, 2009

    heater just doesn't blow hot

  • jacque44 May 11, 2010

    service engine light is on and vechile is not warming up no heat either

  • david Aug 02, 2012

    Sounds crazy but check your coolant level. The heater is the high point of the whole system so if your coolent is low(even just slightly) you won't get heat. When I had this issue with my 2005 sierra that's what it was!

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  • 260 Answers

Make sure antifreeze is full. run engine 10 min. verify engine is around 195 degrees. if not, try replacing thermostat. if it is running at 195, then maybe heater core problem or heater control not functioning properly

Posted on Nov 16, 2008

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