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Heater blower only works on high

Discussion in 'Chevy Trucks' started by JBJ Const., Jan 25, 2013.

  1. JBJ Const.

    JBJ Const. Junior Member
    Messages: 3

    I have an 03 2500 HD and just the other day the heater quit working on speeds 1-4 is there a relay for this I looked through the manual and I can't find one labeled for heater fan.
     
  2. Chiputz

    Chiputz Senior Member
    Messages: 165

    There's a resistor that is mounted in the airbox that causes this problem. Follow the wires back from the blower and you'll see it. It's a little plate that has a plug on it and mounts with one or two screws. Pull the screws and it will come out, you'll see the coil is burnt. Change it out and you'll be back in business.
     
  3. deck2

    deck2 Junior Member
    Messages: 5

    Mine did the same thing a few years ago I have a 05 2500, the dealer told me there was a recall on that exact thing and now the heating system is covered for longer under. Might want to check it out with a GM Dealership.
     
  4. Grassman09

    Grassman09 2000 Club Member
    Messages: 2,806

    He may be out of warranty on that. My 02 was when I called. Its a $60 - $40 part.
     
  5. Rainer

    Rainer Member
    Messages: 94

    Thought it was a recall. I had my '02 done years and years ago, the wife's '05 Suburban within the last 12 months. Both were out of warranty but didn't pay a thing for either repair. Of course, my mechanic actually likes me.
     
  6. JBJ Const.

    JBJ Const. Junior Member
    Messages: 3

    Thanks for the info I'll check it out
     
  7. brad96z28

    brad96z28 PlowSite.com Addict
    Messages: 1,526

    ck the connector to the blower resistor I change them just as much as the resistor on these.
     
  8. mn-bob

    mn-bob Senior Member
    Messages: 130

    X 2
    Here' what they end up looking like

    1d61933a-93b3-102b-93bd-96108a84f749r.jpg
     
  9. Grassman09

    Grassman09 2000 Club Member
    Messages: 2,806

    I have a friend at a dealership he said my truck does not qualify. Almost 300'000kms on it. Apparently they also sometimes do not last to long before they fail again.
     
  10. 06Sierra

    06Sierra PlowSite.com Addict
    from Maine
    Messages: 1,328

    I replaced one in my Wifes 04 Yukon a few years ago. So far I haven't had another issue with it.
     
  11. NickT

    NickT Senior Member
    Messages: 707

    I have an 04 silverado with the same problem, do you have to take the dash apart to work on this?
     
  12. mercer_me

    mercer_me PlowSite Fanatic
    Messages: 6,360

    I had to replace my 2002 1500's resistor last Winter. It takes about five minutes to replace it.
     
  13. NickT

    NickT Senior Member
    Messages: 707

    Can someone explain how to do this ? Thanks!!
     
  14. Grassman09

    Grassman09 2000 Club Member
    Messages: 2,806

    There are a few vids on YouTube. Link doesn't work when I paste it here from my ipad
     
  15. mercer_me

    mercer_me PlowSite Fanatic
    Messages: 6,360

    The resistor is located underneath the glove box and is secured by two bolts. Removing the bolts will allow you to remove the resistor and replace it with a new one.

    1. Disconnect the negative battery terminal.

    2. Open the passenger's side door and remove the two bolts underneath the glove compartment.

    3. Remove the black cover from the resistor pack.

    4. Remove the blower motor resistor and replace it with a new resistor.

    5. Reattach the cover and the two bolts. Reconnect the negative terminal to the battery.

    This video shows it very well. http://www.youtube.com/watch?v=qxWM285eizw
     
  16. mn-bob

    mn-bob Senior Member
    Messages: 130

    :mechanic: Nice write up !!
     
  17. NickT

    NickT Senior Member
    Messages: 707

    Thanks mercer didn't realize if was that simple!!!
     
  18. mercer_me

    mercer_me PlowSite Fanatic
    Messages: 6,360

    Ya, it's wicked easy anybody can do it.
     
  19. cameren_j

    cameren_j Junior Member
    Messages: 13

    I have a 1999 suburban with about this same problem I only have the one speed and its wide open all the time it wont shut off just wide open could this be the resistor as well on mine causing the problem?
     
  20. CashinH&P

    CashinH&P Senior Member
    Messages: 448

    Mine is an 04 1500. All the speeds work but all of the right side only blows hot could this be the resistor?