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On these Gen 2s, there are two rear blend door actuators on the rear HVAC unit.

Both actuators are stock 2009 models.

The usual clicking was heard from one of the actuators.

Both actuators were disassembled. There were no worn nor broken teeth on any of the gears.

I rotated all gears 180 degrees and reinstalled with the excess factory grease applied to the teeth.

Both actuators work when plugged into the rear harness.

The rear actuator, closest to the back hatch, moves when the rear thermostat is adjusted.

The front actuator does not move at any time.

Query: What source controls the front actuator? When is it supposed to activate? What makes it activate and when?
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