GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4
  1. #1
    Sr. Apprentice
    Join Date
    Aug 2009
    Location
    Gulfport, MS
    Posts
    31

    Default Heat is not working!!!

    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. #2
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,606
    Blog Entries
    1

    Default

    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.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  3. #3

    Default

    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. #4
    Sr. Apprentice
    Join Date
    Aug 2009
    Location
    Gulfport, MS
    Posts
    31

    Default How do I do a back flush?

    Quote Originally Posted by MNChevyguy View Post
    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.
    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.

Similar Threads

  1. Replies: 7
    Last Post: 12-20-2010, 01:20 PM
  2. Rear air and heat not working?
    By csmac2004 in forum Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)
    Replies: 5
    Last Post: 10-17-2010, 11:23 AM
  3. Replies: 5
    Last Post: 09-12-2009, 06:23 PM
  4. No heat up front, but heat in rear on '83 'burb
    By FUNFINDER in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 9
    Last Post: 04-20-2009, 02:50 PM
  5. air/heat blower not working?
    By gabronco91 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 7
    Last Post: 12-14-2008, 01:13 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •