So, what is the best way to check this out. It was supposed to have been repaired by a shop before I did a purchase. This was approximately a year ago. I just tried it the other night, and it would not cool. I noticed that the clutch will not engage. It has stickers on the fan shroud, that say it has a certain dye in the system for leak detection. It has the R-4 compressor. I know where the high pressure switch is by the dryer, but I don't know where the low pressure switch is located. What is the best procedure for me to follow to try to bring back up the a/c? At this point I have not done anything with it.

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Rebe