The hearter A/C controls have a mind of there own. Will work some times and other times will run on there own when turned off. Reagl has a bad reputation for electrical problems. Were do I start? Also. What is the torque on the engine cradle bolts?
what is the torgue on the engine cradle bolts? Also hearter controls have gone crazy. on 2002 Buick Regal
The likely problem with the heater and a/c controls is the body control module. You can search online for the torque specs needed.