On my BMW, my a/c started acting up SUDDENLY. When I turn it on, it blows warm. After a while it starts cooling and chills the air very well. At first I thought maybe I was low on freon, I had some added and it sat for a week and worked fine until I drove it a lot. Makes me think I have a high side leak. I don't have gauges to check. I am wondering does this sound like an expansion valve issue? It makes me wonder since it seems to be all on or all off. I guess it could be a compressor problem too. When it does start to cool, the car mist be moving and the RPMS must be up. The problem came on suddenly and before that it cooled as soon as I turned it on.

thoughts? How do you test the expansion valve?

thanks
Fred Emmerich

__________________
MB-less