I have a 91 bronco. When I turn the a/c on it blow out the defrost/heater vents. I have determined that the vaccum valve that switches from the defrost vent to the a/c vent is not being actuated. I checked and there is no vaccum on the hose going to it. Is there a diagram showing the vaccum system for the heat/a/c system so I can troubleshoot it?ThanksTerry
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Tuesday, October 11th, 2011 AT 11:02 PM