just don't rig it up bc a/c work can be very expensive in general. and no one really likes working with german cars so be careful with what you do. but i would recommend a new compressor, not remanufactored or used, brand new oe part not aftermarket either. i see cars come in for a/c all the time at my shop and oe parts seem to be the best bet. get it right the first time and not have to play with it over and over.