I converted over to R134 and the compressor crashed. Put on new compressor and recharged with R134. New dryers on both ocassions. I am about to reinstall the ac after having the engine out and want to get it flushed and recharged. I've heard off debris "clogging" the valve and figured I might as well replace it while I'm at it. I also need to know if there is a 134 pressure switch for the auxillary fan. Mine never worked right after the conversion.