Review on Air Door Actuator - Replaces OEM 89018365, 604-106, 52402588 - Compatible with Chevrolet, Chevy, GMC 1994-2012 - Silverado 1500 and 2500, Tahoe, Sierra - HVAC Blend Control Actuator - Heater Blend Door by Bart Schwalbe

This part was absolutely perfect for the 'fashion' door on my Chevy truck. Before the swap, I couldn't switch between thawing and legs and face. After installation it worked perfectly. MUCH cheaper than OEM parts. The replacement is a little tricky given the limited space, but certainly doable for the average handyman. There are videos on YouTube showing how to do it. The part must be calibrated after installation. Just turn the key on and off twice (on will not start) and wait. The actuators switch to the minimum and maximum range and then bam. Everything will work.