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

These actuators, along with the control module, part number 15-73506, fixed all of the problems I had with the rear heater/AC on a 2004 Yukon XL. The control module is an updated part of the original that addresses the issues described in GM Service Bulletin #06-01-39-015A: Unable to control rear HVAC temperatures or modes, intermittent ticking noise from rear HVAC actuators or DTCs B0434 rear HVAC . or B3764 (Replace Auxiliary HVAC Control Module) – (12 Jan 2007) "I replaced the control module and HOT/COLD CONTROL actuator but still had no floor/ceiling control so I had to replace another actuator. BOTH hot/cold and floor/ceiling actuators have the same part number 15-72972. Others here have described pulling fuses to force calibration. I ended up having to disconnect the battery for a few minutes and then turn on the ignition for the calibration to take place. After that it works great. I replaced all (3) components for less than the GM dealership took for one trip. To be honest I can't believe they still manage to charge for parts for what they do. Anyway, thanks again Revane. I always try to use AC Delco parts whenever possible. I can typically buy a Delco AC from Revain for about 25-40% less than what the aftermarket auto parts store claims.