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I'm looking at purchasing a new R4 compressor and am finding a lot of conflicting data among vendors on part numbers for our application.
There seems to be 5 or 6 different Delco part numbers for a V-Groove R4 compressor.
Are there differences that would make one unusable on a C3?
It seems like the ideal one is the one that has a fitting for a high pressure switch should I ever decide to use R134. Some models have no fitting for this.