Heater/ AC Control Cable Questions

Discussion in 'The Big Chill' started by Rich Skylark, Aug 9, 2019.

  1. Rich Skylark

    Rich Skylark Gold Level Contributor

    On my 68 SkylarkCustom350 I’m trying to change the HVAC cables but I’m not sure if there is is 2 or 3 cables. The heat & defrost cables ( Red and Blue ) are clearly labeled on the unit but can’t find another cable attachment point. I have a chassis manual that only shows blue & red. My vehicle only had originally 2 cables. The set I’ve ordered from Vintage Air has 3 . I’ve also read discussions mentioning a green cable.. Is there a third cable and where does it mount?Any and all help is welcomed

    Attached Files:

  2. Brett Slater

    Brett Slater Super Moderator Staff Member

    Most likely that's the one closest to the driver's side, up on the top of the heater box.

    I just put mine back together today and it absolutely sucked.

    It's almost easier to access it with the box detached from the firewall.
  3. Rich Skylark

    Rich Skylark Gold Level Contributor

    Brett I knew the only correct way was to take out the unit. Inspecting the ducts- lines & hoses to see what might be missing and get a grasp on their attaching and routing was not easy for a large guy with large hands. A few vacuum lines were loose, the fan switch needed changing and the pass side duct was MIA. Only the blue & red cables were there, tabs on both broken can’t find anything in the manual to show where the 3rd cable goes. Maybe someone who has rehabbed the HVAC on a 68 Skylark can chime in with some thoughts?
  4. Rich Skylark

    Rich Skylark Gold Level Contributor

  5. buick64203

    buick64203 Just plum crazy Staff Member

    I never owned a 68 A body with the thumb wheel controls. I have a 68 Riv but thats a different animal....

    What I think is that you only have two cables- red and blue. The later A/C cars have three cables. The green one is attached to the top of the box roughly behind the radio
  6. Rich Skylark

    Rich Skylark Gold Level Contributor

    My guts been thinking that all along Jason.I'm learning to trust my gut even with conflicting info presented to me.Let the reassembly begin !

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