Heat is not working!!!

Discussion in 'General Chevy & GM Tech Questions' started by senorquill, Nov 4, 2010.

  1. senorquill

    senorquill Member

    My heat has started to fail me on my truck, It blows out cold air. After about 20 minuets of driving is will just all of a sudden start pushing out hot air. Not sure if it is electrical or just the knobs.
    I have a 2002 silverado with the dual climate control knobs that go up and down. Thanks
  2. stephan

    stephan Rockstar 4 Years 5000 Posts

    If your temp guage is showing that your thermostat is working properly, then it sounds like your blend doors is sticking & then just popping open & allowing the warm air to finally circulate. These systems are complicated so if you don't understand how it works, I would recommend taking it to someone who knows.
  3. MNChevyguy

    MNChevyguy New Member

    Had this same problem in my 01', I've been noticing the same issues with my buddies trucks. Just do a back flush on your heater core and see if that helps. I've hardly ever seen a temp door on those trucks fail. I did mine last winter and no problems since.
  4. senorquill

    senorquill Member

    How do I do a back flush?

    How do I do a back flush?

    ---------- Post added at 08:30 AM ---------- Previous post was at 08:22 AM ----------

    Around how much would it cost to pay and have someone fix those doors, if that is the problem.

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