A/C works intermittently

The problem was high pressure control was defective, I no longer have this car.

Thank you, sir. Do you happen to recall where this high-pressure control switch was? I don't seem to find it in plain view - looked in the back of radiator, on the a/c lines from compressor, from cabin, nowhere to find. I don't know if it is in the front of the condenser, which is between the power steering cooler and main radiator. Thanks for your reply in advance.