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.