I havent changed anything belt wise... the a/c was working fine a year ago, then the thing died for 7 months (wiring...) and when i got it running again it was october. no need for a/c. I know the belt is tight. I will check the pressure tommorow. Having an auto-shut off for low pressure in the a/c system would be a new one for me... wouldnt it also throw a code if that were the case? When all yalls a/c wasnt working, did the light on the button come on?