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Old 01-18-2001, 01:02 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The vacuum to the heater valve is either on or off. Blending is done with the blend air doors that the "feedback" potentiometer sits on. The pushbutton allows variable vacuum to the element for feedback thru the switch-over valve assembly. NOT a simple system!!
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