The other day I parked on my driveway a few minutes after driving. I hear a fan kick on assuming it was my engine cooling off, but four hours later I was out to get something out of my car and the a/c was blowing almost full blast without key in ignition. I also noticed that it has drained my battery. I had to jump start the car the following day. The sad thing about this is that I just replaced my battery a day before.(maybe nothing is wrong with my old battery). My mechanic said it might be my climate control module or my a/c blower regulator. Before this incident I've been having problem with one side blowing cold air and other side blowing hot air. Any ideas what my problem might be??