There is a thumping or clicking noise in the driver's side rear panel (inside it sounds like) If i put my hand on the area I can feel it. Just started today and when I began looking up the problem I found that this just might be the problem. Just don't know exactly where to look, or what it looks like or what to check for.
The rear blend door opens and closes to regulate air temperature. It's operated by a small electric motor. So the problem can be a stuck door, bad linkage (if your model uses linkage) or a bad motor. Bad motor is most common failure, but they usually fail in one position, not the clicking state. You'll have to remove the trim panel from the rear heater assembly. Then just follow the wires to a flat black box and listen for the noise. That'll be the actuator. Disconnect the electrical connector. Remove the screws that hold it in place. Then try moving the door by hand. If it moves freely, then the actuator is bad. Replace it.
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