Air Conditioning problem
1995 Ford Mustang V8 Two Wheel Drive Manual 120000 miles
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I hook up a pressure gage and it cycles high then low when it goes high the compressor turns on and then off when it goes low.( takes about 2 seconds for the pressure to drop). I have no cool blowing either. The pressure is fine if car is off.

With system off there should be @ 90psi. Running stay 32-35psi. Reallt sounds like low refrigent level.
Hope this helps