heater fan relay

Discussion in 'General Chevy & GM Tech Questions' started by soatway, Oct 5, 2008.

  1. soatway

    soatway New Member

    I have a 94 k2500 gmc suburban with the 454 and a/c. I am having a problem with my heater fan motor. The motor works fine but only on low or high. There are two medium settings where nothing happens anymore. As i go though the differnt positions i can hear a soft clicking coming from what appears to be four relays sitting on top of the heater ac unit under the dash. I have the glove box out. How do i isolate the relay? Are they all the same part? Can anyone help me? I have read the available posts and feel like I am close to a solution.
  2. collinsperformance

    collinsperformance Epic Member 5+ Years 500 Posts

    i bet it is the resistor pack or switch that is the issue. the resistors control what speed the motro goes into...........mike
  3. dwill3015

    dwill3015 Epic Member 5+ Years ROTM Winner 1000 Posts

    Check THIS THREAD out and it should give you some good info.
  4. unplugged

    unplugged Epic Member 5+ Years 1000 Posts

    Bravo. Not the most complete body of data, but very, very good. Thanks!:rofl:
  5. soatway

    soatway New Member

    The resistor pack sounds like what was calling the relays. I work at a gm store so will check it out . Thanks/

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