If you are asking why the 400E gets checked. Its because there is a leak, AC will work for a few months. When I have brought it in they have said it holds vacuum but obviously there is a leak.

From what I know about W124's its likly to be berried in the dash. I am not going to have an AC place take the dash apart to fix it $$$. So unless I start working on AC systems myself its get it topped off yearly.

Just-n-time
Can you be a bit more specific (or state where to get specific info on converting an old compressor). Obviously the propane tank wold be used for recovery. However how do you rig everything up for proper recovery????

Paul

When you pull the compressor out of a freezer,the older units have charge ports like your car, To service the refrigerant.All you need to do is hook your gauges and plug it up,you can get around 18pounds.you will have to tinker with the tank to rig up a line to fit the hose to the tank,lost all my photo's to show how to build it,when I moved to our new home.most all of that stuff is packed away in the old barn.But if you sit and look at what you need you will figure it out.JNT