Getting Neglected A/C going (1 Viewer)

[BlueCruiser84]

Oil is not removed during the vacuuming process. It is mostly suspended in the refrigerant and 'most' is lost when a system is 'evacuated' BUT in the case of leak (especially a slow leak) some amount of residual oil will pool in the lines, condenser, evaporator and drier. How much...is anyone's guess. That it is why it is best to flush a system that has been sitting for awhile or the condition of which is unknown.

Most systems (empty) will require 7-8 ozs (total system including the compressor). Too much oil will result in poor A/C performance, too little (significant amount) will result in decreased compressor life.

this system never leaked for me. It had a motor swapped in shortly before I bought it and my feeling is the AC was probably disconnected during that time. I know nothing about the condition of the AC before that time.

I put about 3.5oz (combined) in the compressor and spun it around by hand and down the high pressure line into the condenser which I had flushed. . Once I get the belt on I’ll jump the pressure switch and see if I can get the clutch to engage. I’ll post back then.

 

[BlueCruiser84]

Well she’s blowing cold. Haven’t taken it for a drive yet. We’ll see if it lasts.

Old expansion valve was stuck.

*PSA* if you can avoid using GPD parts do it! The Orings are too small and the holes in the expansion valve were too small - the factory pipes would not fit. I bought a Denso expansion valve and it fit perfectly.

Thanks everyone for the help and information.