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Q: Ticking noise on 2008 Chevrolet Impala

There is a ticking noise comming from behind the glove compartment when I start the car and then it goes. Any idea what this might be?
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Very often a clicking that last about 10 seconds is one of the HVAC acuators. Eventually the control panel will time-out and the noise will quit. When the vehicle starts the control panel runs the stepper motors from one stop to the other to establish the range. If range cannot be established it will continue trying (clicking) until it times out.
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