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I have a loud knocking under my dash for my 2009 Chevy Impala. In addition my fans for AC and Heat have gone offline and fuses are all good.

Any ideas?
 

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Sounds like the CLICKING maybe the Actuator(s) and I would test the motor while your down there that it powers up. Could be related to the Controls or bad connection at the connectors, or bad motor...

James
 

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Does it sound like the blower motor is working at all? Can you hear any variance in motor speed when you adjust it, knocking noise get faster or slower when you change the speed? Feel any flow at all with it in fan/heat/ac modes?
 
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