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HVAC Temperature Valve/Select Valve Operation [message #77274] Fri, 19 March 2010 18:58
larry.whisler is currently offline  larry.whisler   United States
Messages: 356
Registered: August 2005
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Senior Member
I have the dash partially apart and am trying to confirm the operation of the HVAC/defroster system.

I am having a problem with checking the heater/vent valve that is located under driver's side dash.

The slave vacuum module (for lack of a better term} closes when vacuum is applied to the module, as I think it should.

Is this correct?

Well, if this is the case, what opens the valve? Only way I can open this opens is when I manually open with my fingers after the vacuum has done it's job.

larry.whisler
76glenbrook
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