I gave up chasing leaks in my '87, so I just replaced everything If I were a bettin' man, I'd bet on the evaporator, then the condenser, then the manifold hoses.

Seriously, I have had an o-ring blow out on the compressor-to-manifold junction. There are four o-rings that seal the compressor body to the manifold. Then two more that seal the hoses (what Mercedes calls the manifold) to the compressor. All six o-rings are the same size. It's easy enough to replace them all once you have the compressor out of the car; no reason not to do so.

I'm sure there will be some frustration the first time, but I can have the compressor out of my car in about 15 minutes, using only hand tools. It's not a bad job. Don't forget to disconnect the electrical before yanking it out of there.

- JimY