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2010 Dodge Ram 1500:

All blend door actuators operate/ not broken. Can be turned manually and electrically.
Rotary knobs for air displacement and speed operate correctly.

Rotary knob for heating and cooling will illuminate when pushed for a/c but will not actuate the blend door actuator itself, when turned to hot or cold. Notorious clicking noise heard at hvac system after engine is shut down but no apparent issues as stated above.

Removed actuator from blend door spline (actuator still connected to electrical system) and turned knob to hot/ cold: would not rotate splines on actuator; new actuator installed: same inoperative issue.

suggestions? Replace control head? Are there hidden fuses for hvac system beyond fuse box under hood?
 
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