First the electric motor can burn out rendering the unit non responsive so nothing changes when the temperature or.
													
																	Chevy impala blend door actuator locations. 
									
	
		
	
																	The noise happens when i open the door and last for about one minute after the doors open. 
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																	Have a 2009 chevy impala lt 3 5 l v6 i have a have a 2009 chevy impala lt 3 5 l v6 i have a clicking noise underneath the dash with the blower motor is.