Loud Knocking in the top center of dashboard when cold

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Hits2

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I have a 2016 AWD LTZ, and when the temp is below 20, I get a loud knocking in the top center of the dashboard when remote unlocking. As soon as I start the car, it stops. It does not happen when the temp is in the mid to upper 20's. Also, when I drive it a short distance (to a store) and return to the car, it will NOT make the knocking sound. Do you have any thoughts on what part may cause this?
 

ricklack

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Perhaps the defroster vent actuators are having an issue when cold?
 

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