Review on ACDelco GM 15-73044 HVAC Panel Mode Door Actuator - Genuine Original Equipment by Gary Flick

Replaced this on my 2002 Trailblazer LTZ. There was an odd click coming from behind the dash. I found the instructions online and exchanged them in about two hours. This module is located on the driver's side closest to the driver and not next to the firewall. After reconnecting the battery and turning the key to the non-start position, I illuminated all the service lights, turned the ignition back off, and started the truck. The clicks are gone and the air works like a charm.