How many pounds of freon?

Discussion in 'Western Star Forum' started by fortycalglock, Jun 8, 2012.

  1. PSM379

    PSM379 Medium Load Member

    Apr 19, 2019
    Old thread, figured I’d ask here instead of starting a new 1. I have a 1985 4964-2. It’s similar to the heritage. Old style York compressor. Condenser broke, so I put new condenser, new drier, 2 new lines, all new o rings and compressor. Sucked it down, held vacuum for a hour dont think it moved at all. Started charge, has about 2 lbs in it, started blowing cold, finalized with about 5 lbs. gauges were reading about 20 on the low side, 150 on the high side. Seemed low to me. Let truck run for a while, the numbers were dropping about after 2 hours, expansion valve and low side lines were freezing up, 80* ambient temp roughly, I was getting 42* at the cab vents, just a hair below 40* at sleeper vents. About a half hour into this cab vents went up to 55* sleeper was still blowing pretty cold at hair below 40*. I thought I could of undercharged it, as my gauges were reading low also. So I put another can on, my high side sky rocketed to about 275 low side 45. Oil squirted out what I believe to be a relief valve on the back of compressor. Did I toast this compressor? Any ideas of what I could be doing wrong here? Bad expansion valve? I’ve charged and serviced my own AC systems on a couple of my trucks, and thought I understood them a bit. This York compressor is new to me though. Also this system doesn’t have the high and low switches in line like my Peterbilt had. This has a round plug that plugs into the drier. Any help would be greatly appreciated. Thanks
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