Need Part Numbers for AC Pressure Switches Please Help!

BigLurr54 · June 27, 2018

I have a 2001 Yukon XL with rear air that I am trying to get the air going again. I had a leaky Schrader valve on the low side. I replaced that and the system held a charge over the winter. The compressor seems to continue to cycle all through the winter even with the AC off. Now that the weather is warmer, I try to get the AC working and it does not blow anything cold. The compressor will cycle on for a second then off for a minute them back on for a second then off. I am going to take it all apart this weekend and flush it, replace the accumulator and orifice, and empty clean and refill the compressor. I am going to replace the rear air expansion valve as well. I would like to replace the three pressure switches as well. I am struggling finding the part numbers for what switches I need! It appears there are three switches on the system. A high pressure on the compressor, a high pressure on a AC line, and low pressure on the accumulator. They seem cheap enough for switches so I figured I should replace them while I’m in there. I would like the Four Season part numbers for the switches so I can have them on hand. I can try to cross reference the Delco part numbers if someone has them as well.