there are only two service ports on this system, low pressure is on the poa and the high pressure is on the in line muffler there are no other service ports to access. so to answer your question yes that pressure was at the poa service port. the flush is called johnsons Freeze. it is compatible with...

well it took a month to get the poa shipped to Florida for inspection and repair. the poa was bad and i had to wait for them to rebuild a new one for me. i reflushed the entire system, just to be sure, drained all of the pag oil out of the compressor and made sure it was clean. new receiver/dryer ag...

recovered the system and took the poa out to bench test it. found that the poa is stuck open. not all the way but somewhere in between. so that explains the fog horn sound and the high evap temps. i also tested the txv just to be sure it was ok. seems to be working as expected. open when bulb is war...

checked all of the items you mentioned and even disconnected the hot water hoses (bypassed heater core completely) cables are closing the doors maybe minor leakage but nothing to write home about. looking deeper into it when it is running the poa is making a fog horn sound. i tried tapping on it bit...

new to the forum and i have some questions i could use a little help with. i am working on a 1967 Chevrolet El Camino. i am converting from R12 to 134a. Background : The car has the A6 compressor with a poa valve, and txv. i have taken the system apart completely. i have flushed the evaporator, cond...