My a/c system is all new less the evaporator. It is fully charged and converted to R134. When I press max the compressor turns on and the cooling starts. It cycles on and off but the vent temp only reaches 48 degrees F. When I bypass the cycling switch and the compressor runs continuously I get 35 degrees F at the vent. Is this the ATC preventing me from freezing in the car, or is the cycling switch/temp probe in the capillary tube ( is there a special grease that goes in there that would slow down the reaction to cold ? ) sensing cold too quick and shutting off the compressor ?