evaluating an AC compressor when system is currently discharged - PeachParts Mercedes-Benz Forum

MCallahan · #1 04-27-2018, 12:12 AM

Guy told me the AC didn't work in my W124 when I bought it. Same as yours, it had a little pressure in the system. Read 20psi static when I put a gauge on it. Charged it up and it works perfectly. I'm sure it probably has a slow leak, but the compressor was free and it still had 134 in it. I vacced it down and recharged it in Feb. Freeze you out right now with temps in the 80s.

ROLLGUY · #2 04-27-2018, 10:30 PM

Quote:

Originally Posted by MCallahan

Guy told me the AC didn't work in my W124 when I bought it. Same as yours, it had a little pressure in the system. Read 20psi static when I put a gauge on it. Charged it up and it works perfectly. I'm sure it probably has a slow leak, but the compressor was free and it still had 134 in it. I vacced it down and recharged it in Feb. Freeze you out right now with temps in the 80s.

Your W124 probably has the Denso compressor, and is much better at keeping sealed than the R4. The Denso is similar design to a Sanden.Having 30+ year old hoses doesn't help either. I would not gamble with an R4 or old hoses, hoping it will keep the R12 in the system. It is just too costly.