15-81728 HVAC Control Module / GM Trucks & SUV's w/ Automatic A/C / 2003-2006

There is a new development in this repair. It seems that General Motors has added or changed a circuit in the new module that reduces what they refer to as "Thermal Events". In doing so the new module does not always play well with aged blower motors. What we wind up with is this. The blower motor will not work on an engine restart unless the a/c controls were switched off before the ignition was cycled off and back on after the engine is running again. The two immediate ways to address this issue is to learn to remember to cycle the switches in the above manner or replace the aged blower motor with a new one.  We suspect there may be a software update somewhere down the road but that will require dealer level programming abilities. Since the replacement part is only available from GM or through an AC Delco distributor we are all being subjected to this problem.