2004 gmc 1500 4x4 cabin fans not working

Discussion in 'Mechanic and Repair' started by mower&more1986, May 21, 2009.

  1. mower&more1986

    mower&more1986 LawnSite Senior Member
    Messages: 524

    ok the fans in my truck arnt working anymore. it started with lowest speed going bad then the others as i was switching them on about 6months down the road.
    so a friend thought it was a fuse but i checked the ones in the cab but i may need to check again. im wondering if its a switch but idk. atm i cant afford to take it in the dealer have it checked out.
  2. freedm2

    freedm2 LawnSite Member
    from PA
    Messages: 217

    Do you have auto climate control or manual?

    If its manual it sounds like the POT has gone bad. Think volume control on a stereo.
  3. mower&more1986

    mower&more1986 LawnSite Senior Member
    Messages: 524

    manual and thank you for the respones. any ball park idea what it could cost to fix
  4. Mike Fronczak

    Mike Fronczak LawnSite Senior Member
    Messages: 301

    If its the same as my wifes trailblazer it is a resistor switch. Did same thing hers now works only on high. New switch was $ 80. I've had it for 3 months now, we'll see if I ever get time to change it.
  5. rwar

    rwar LawnSite Member
    Messages: 115

    look under the dash on the pasenger side,follow the wires to where it plugs into a connector by the blower motor,my 05 gmc melted the wires there,there is a big resistor under that connector its probably bad
  6. SfTD_service_CENTER

    SfTD_service_CENTER LawnSite Senior Member
    Messages: 868

    resistor easy fix napa auto parts has them instock usually for chevy, gm. common issue have any problems come back here im sure any people who have done them can talk you through it, or ask a napa parts guy some of them have the knowledge to help.
  7. dta1984

    dta1984 LawnSite Member
    Messages: 3

    Yep, its the blower motor resistor. It was a $40 part at Advanced. I have an 02 Silverado, and it was an easy fix. It is located under the dash on passenger side. Seems like one of the black plastic air ducts had to be removed, but after that its just plug and play.
  8. mower&more1986

    mower&more1986 LawnSite Senior Member
    Messages: 524

    thank you for the response and i take a look tomorrow mourning
  9. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Not that particular problem but I've fixed mine with parts from Ebay before.

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