Try blowing out the radiator and the condenser on the front of the tractor. My NS4710 is very sensitive to trash and debris getting in the fins. Even if it looks clean, clean it anyway. If you don’t clean it regularly, the system could start heating up and cause the compressor to fail. Easiest way to do this is to get an air comb. You can get them from Amazon for $30 or $40. If you are doing dusty work like brush cutting, clean it daily. May even need it more often if you’re cutting tall dry sage brush.