Message: On the "Heater Fan Dead" series of posts are a couple of references to the "actuator." I had a sequence of problems including blower speed (fixed by new resistor), temp control (fixed by new thermostat) but still have air only through the defrost vent. Did not find a vacuum leak. So what & where is the actuator, how does it work, & can it be repaired?
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Subject: HVAC Actuator