I added two cans of R134 (24 oz) clutch kicks on but only warm air out. High pressure sticks on 120 psi but low side drops off to negative 5, and the compressor is noisy. What could it be? Do I need to add more Freon? Thanks much, Ray.
I vacuumed the system and R134a in 23 oz is required. One of two cans-12 oz each, is with UV leak detector. I don’t find any leak externally but am not sure about the expansion valve and the condenser, because it is hard to see. Anyway, the compressor, dryer, and expansion valve were replaced recently. There are two things I doubt about:
More PGA oil might be needed for the compressor, and
There could be a leak between the condenser and expansion valve.
Does this make sense?