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I have a 2006 Chevy Monte Carlo. When I move the Knob Indicator from Closed Vent to Open Vent it begins to make a clicking sound behind the dash. It does this for 30 seconds then goes away. What might it be?

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You have a vent mode actuator with a bad diaphragm. Most people don’t fix
them if it involves removing the complete dash. If the one acting up can be
reached from underdash or with the glove box removed, the actuator is
probably available from AC Delco, an HVAC supplier or the dealer can order
one for you.

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Jim O’Neill
Chino Autotech Inc.

 

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