My wife has an 05 Mustang GT Conv. The AC will now only blow cool (not cold as it should be) air from the 2 passenger side vents and hot air from the driver side vents. The compressor clutch is kicking in every 5 or 10 seconds. The low side pipes are not cold and the high side pipes are not hot, but warm. I put a cheap guage on the low side and it would read in the yellow band for "Caution" and then drop to the "Low" band. Sorry I don't remember the exact numbers. Anyone got any ideas?