Hello, I've been working to revive the A/C in my '66 Toronado. I rebuilt the A6 compressor, had the hoses remade, replaced all o-rings, dryer, flushed the system, added 10 oz of PAG oil150 and 30oz of R152a (manual called for 4 lbs of R12, so 60% of that). I had tested the POA with compressed air and set it to 30 PSI. With the system running, it still read 30 PSI. High side was 80 PSI. The hose coming out of the evaporator was cool, but after the POA, it became very cold, to the point that frost was forming on it. Outlet air temperature was probably in the 50s (60deg day). Any suggestions? Thanks.
I have the heater core bypassed now. Blend door is in the COLD position. The outlet line coming out of the evaporator is at about 50 degrees. Once it goes through the POA valve, it has ice all around it. It's been suggested to me that the POA may be clogged, but it's still regulating low pressure at 30PSI.
My poa was sticking when i rebuilt my system . When car was running and ac compressor turned on i had similar conditions with frosting. A few taps/smacks to the poa with a nylon screwdriver handle or a hammer handle made it loosen up and work correctly. Havent had to touch the poa since . That was 5 summers ago. Im am not familiar with the refrigerant u listed. I used r134a in mine