Those recharge kits from the auto parts stores hook up to the low side port. You see the pressure drop when the compressor kicks in because the compressor is pumping the freon from the low side to the high side. And as GM Tech said, this rapid cycling is a sign of low refrigerant. Two possibilities:...

I did the work this weekend. Pulled the old OT, slipped in a new one. Replaced the schrader valve core on the low side and ball valve on the high side while I was there. Nice and cold front and back now. Unfortunately, I get a freon smell from the front air stream, that I do not get from the rear ai...

Well, gee, that makes sense when you put it that way I was indeed missing the fact that the rear system does not operate when the front is off. I had kind of suspected the orifice tube - thanks for the confirmation. Will pull and inspect.

Vehicle: 2004 Escalade Ambient: 70deg F Refrigerant: R134 Hi guys...just registered, but I've been lurking and learning for a while. I've been pretty good at diagnosing and repairing issues with my other vehicles, thanks to the info on this forum, but this 2004 Escalade has me quite puzzled right no...