Vacuum to heater valve?

Discussion in 'The Big Chill' started by Premier 350, Apr 4, 2020.

  1. Premier 350

    Premier 350 Chris (aka Webby)

    Just fitted the vac operated heater valve to my '69 Skylark. Factory A/C car. Even when the temp control lever is in cold position, I still have some vacuum to the valve. No vac gauge to check it with. Is this normal? Since we apply vacuum to open the valve, I thought that it would have zero vacuum with the temp lever in the cold position?

    Any thoughts?
    Thanks ,and stay Corona free!

  2. 12lives

    12lives Gravity is matter warping space-time - Einstein

    There is a vacuum shut off valve on the temp lever control behind the dash. That could be leaking. Also, did you test the heater valve to be sure it operates correctly? Some are vac to close but they look identical.
    Premier 350 likes this.
  3. Premier 350

    Premier 350 Chris (aka Webby)

    Thanks Bill. Valve is a new one and vacuum opens it. I did suck on the valve end of the vac hose, and it held vacuum. I'll try it in both cool and warm settings.

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