hvac control unit

  1. N

    1990 HVAC works when it feels like.

    Hi all, I’ve got a 1990 K3500 I use to plow. All of a sudden, the digital HVAC controller will 9/10 times not turn on with the truck. The back lights are all on, but the screen is black and the buttons do nothing. I checked all the connections behind the glovebox. I removed the unit and...
  2. C

    A/C wiring harness

    I need help. My son and I are working on his first truck. It’s a father-son project, 1991 K1500 350 4x4 5 speed reg cab. It needs the engine rebuilt along with a little body work. We were pulling the engine out the other day, and while disconnecting all the wires I noticed he has nothing going...
  3. retmotor

    Power to the HVAC Head

    So yesterday, there I was minding my own business, coming home from the hardware store, when I hopped in the truck and there was no power to the HVAC head. Thankfully it was only 112 degrees (it's been a cool summer this year). Fuse you say? Nope. I saw Schurkey's thread on the connector...
    • retmotor
    • Thread
    • hvac hvac control panel hvac control unit hvac head
    • Replies: 5
    • Forum: Electronics
  4. D

    Manual HVAC control repair?

    Has anyone taken their HVAC controls off and looked to see what broke in them? I'm thinking maybe it's the dials, or possibly a capacitor like old computers (or the OG XBox). Not really wanting to spend upwards of $120 on a control panel for a truck I paid $450 for. I have a 97 K1500 in case...
  5. dudeinthepnw

    Does anyone have the hvac schematic for the control panel? (1990 2500)

    When I got the truck a few months ago, one issue it had was the radio wasn't working. I ordered a retro sound factory unit that still allowed me to have aux etc but also still look factory. I removed the factory stereo and the CMD (I think that's what it's called, the part under the dash that...

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