Been working on the G car AC system. I started by removing the interior components and restoring everything. New foam rubber seals, sandblasted and painted all the metal inside pieces, new heater core. Flushed the evaporator and leak tested it. Replaced a bad vacuum switch, the expansion valve, and the receiver dryer. Flushed and leak checked all the hoses and the condenser. Replaced the compressor with an NOS Ford D1AZ unit. Replaced the idler pulley bearing. New Heater control valve. All new vacuum hoses and heater hoses.
I sucked it down to 28" of vacuum overnight. It charged easily. It reads about 0 PSI on the low side and 215 PSI on the high side at 1500 RPM.
It blows warm air. With those pressure readings it ought to be cooling well. What am I missing? I did check that the heater valve is operating properly.
Royce
My many years of r12 systems would say the expansion valve is not opening, dryer or condenser plugged. Can the expansion valve be on backward? I’ve always seen 10-40 PSI on the low side when compressor running. 215 is high I think it should be no more than 180-190 depending on temperature. With the compressor running touch the suction side compressor fitting, it should be cold. If not you are not getting flow.
I agree with Jim. I find it hard to believe the new filter is completely plugged, but the expansion valves are easily plugged if you have trash in your system. I assume your power head bulb is mounted to the line like it is meant to be. The expansion valve may have lost its charge.
It is a brand new expansion valve from WCCC. I agree it acts like a restriction. I’ve never seen the low side pull a vacuum with the system charged. You cannot physically install the valve backwards, the line connections are two different sizes. I flushed all the system components with alcohol and blew them out with Freon so trash in the system is unlikely.
Maybe a bad expansion valve brand new? That would be unusual but nothing is impossible.
I had a NOS TXV refuse to open and after a while with the high side pressure sitting there it opened quite suddenly making a loud rushing sound.
Have you tried tapping on it while the system is operating? Also, assume you have the bulb properly positioned and in intimate contact with the low side line? Insulated?