When I start car with AC enabled, the compressor will engage within about 2 to 10 seconds (with resulting cold air) and then disengage after about 5 to 20 seconds. A few times the compressor engaged and cycled off/on few times before disengaging completely after a minute or two. A gauge on the low pressure fill port shows adequate refrigerant pressure when the compressor engages. I wanted to locate and possibly test the low pressure cycling switch but cannot locate it in engine compartment. Any ideas or suggestions on what the root cause of the problem may be? Thank you.