[DML] Re: Troubleshooting HVAC vaccumn controls

["sweitzel_2000" <sweitzel@xxxxxxxxxx>]

It sounds like the little rubber 'nubs' on the rubber mode switch
diaphragm are probably broken off. This causes the plastic mode switch
disc to get out of sync with the diaphragm (the mode switch twists,
but the diaphragm doesn't causing vacuum to be sent to the wrong flaps
at the wrong time. Solution - order a mode switch rebuild kit from one
of the vendors which includes a new diaphragm.









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