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Noise from acuator doors???

(2004 GMC Sierra 2500 HD)
in Point Pleasant Beach, NJ on May 16, 2012
I hear a clicking from under dash with HVAC on or off and in any setting
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Popular Answer
on May 17, 2012
You may have a problem with the BCM that controls these functions at the actuators. Have a qualified tech attach a Tech II tool and monitor the circuit.
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