Air Conditioner problems of the 2002 GMC Envoy

A day after replacing the battery, while driving, the driver seat started readjusting and heating on its own so I turned on air conditioner to compensate since I had no idea what to do about the seat while driving. When I did, rear passengers said the rear vents started blowing heat, and a strange clicking noise was heard in the right rear panel, so I shut off the air, opened the windows and clicking and heat subsided. However, the drivers seat continued to readjust and heat throughout my trip and the right rear window had to be pushed up manually once stopped because the electric opener for that window was no longer working.