recently the air conditioner of my car has become unresponsive. sometimes it wont react to any of the buttons pressed, the lcd screen either goes blank or only parts of the numbers will show up, and worst of all sometimes it will get stuck cycling between fan strength, switching between blowing the wind at the feet, head, and windows and temperature seems to be stuck at the coldest possible when its like this. i ordered a new climate control module but i just want to be sure that its the actual problem here. could these problems be caused by any other part in the car? (http://www.oehq.com/acdelco-parts_15-72956_ACD_ACDelco-Heater-Air-Conditioning-With-Rear-Window-Defogge-Control~2004-CHEVROLET-SILVERADO-2500-HD-6.6L.htm)