This is a friend's car, A/C was blowing warm. Compressor wasn't engaging, though at-rest pressure was about 75 or so (I think) on high/low sides. A little low, to be sure, but not low enough to shut off compressor (?). Anyway, friend recently paid about $175 for top-up; I explained the only way to top up is if the system is low, which means there is a leak. Sure enough, I find oil slick around the fitting at the pressure switch. I jumper the switch, and system engages, then after some pressure has built I put the sniffer up to the joint and it goes off like crazy (and no, this is not the cheap Harbor Freight sniffer). So the fitting is definitely leaking, but the switch is also bad. When jumpered, the line quickly became cold.

Question - what is the switch called? We were calling around trying to locate one, and ran into several descriptions. I believe it is probably a low-pressure cutout switch, but not sure. It screws right into the accumulator canister. Any info would be appreciated.

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