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Re: Zero Heat
There are three actuators that control where the air is going. First is the vent type (defrost, floor, or front vents), a blend door that controls the temp, and a recirc door which allows or prevents outside air from being used. All of the air passes over the heater core and AC fins (unless you have the heater core bypass solenoid for use with AC).
If you aren't getting anything, the recirc door is probably closed. The actuator may be toast. It's the most fun one to replace too. The control unit in the dash could be the culprit as well. You'll need to test voltage at the actuator connection to validate it's not the control unit.
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Mike
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