My wife's 2011 Impala made this clicking noise under the dash when she opened the door and also when the heater was turned on. So, after troubleshooting, I came to the conclusion that it was the air door actuators, left and right under the glove box. It's the same part so I bought two and now I'm not clicking anymore and I'm happy to report that I saved about $80. Thank you Rewin!
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