Review on ACDelco GM Original Equipment 15-72972 Temperature Valve Actuator: Reliable Control for Optimal Temperature Regulation by Michael Boyle

Works great so far after a week of use. Very easy to install. The hardest part was removing the plastic panels from the rear HVAC unit. I also replaced the computer module on the rear AC (AC Deloc #15-73506) so I'm not entirely sure if it was the drive, the module, or both. The local Chevy dealer checked the codes for me and said both were bad. I figured why not replace both while I was at it. The rear air conditioner only blows cold. After swapping two units, it works great and blows heat again. The local Chevrolet dealer wanted to charge me $271 for the same AC Delco part plus labor ($900 total)!