So ever since I bought my 99 blazer LT my ac likes to turn on and off. It blows cold as hell when it runs but then it will turm off for a little while then turn back on. Would it have anything to do with the climate control system for when you put it in auto mode? any help would be greatly appreciated.

 

A little more information is needed, do you mean turning on and off as in your compressor kicks on and off? If that is the case more than likely it is low on coolant.

 

The compressor is supposed to cycle on and off.