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 Andrew Vogel

That solved my problem. Now my driver's side is hot again. The drive on the driver's side is located on the passenger side at the bottom of the bar. The blender door did not close. Installed new actuator, everything works. Plastic part to turn the faucet door, but $100 less than my local auto parts store I don't care. It works! 2003 Chevrolet Suburban LT 1500 with dual climate control. .note.my system didn't work right away. I had to recalibrate the temperature controls. I have uploaded the information. After that, the system was 200% better than the new one.