It is a low pressure AC clutch cut out switch. It keeps the compressor from running if the system is low or empty of freon.
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No, but after changing make sure system is evacuated prior to charging
Mostly used in automatic transmissions, the accumulator piston is located in the accumulator. The accumulator consists of a cylinder and spring loaded piston and is used to provide fluid to the internal shifting servos at a rate higher than the pump can provide. Between shifts, some of the fluid from the pump id diverted to refilling the accumulator for the next shift.
I have seen this before more than likely your coolant sensor has a internal short and needs to be replaced.
Viktoriya Kalenik
Sounds like your cooling fan relay is shot. Ron J.