How to determine the car air conditioning pressure switch is good, or bad?
What are the steps and methods of operation?
Pressure switch is equivalent to a switch, the multimeter hit resistance through the file, conduction is good, broken is bad, but the premise is that the system has refrigerant
Air conditioning pressure switch is usually two, one is low-voltage protection, one is high-pressure protection, the approximate principle is:
When the pressure inside the system is increased when the pressure is set, the pressure switch is automatically opened, the system stops working. When the system pressure drops to the set pressure, the pressure switch is automatically connected. The system is working normally. The air conditioning pressure switch is the air conditioner Pressure, and then the pressure signal to the air conditioning control system, play a protective air conditioning compressor and the role of the pipeline. Only the pressure signal in the normal range, air conditioning can work properly.
Then take the table to see if there is no system pressure 0.5M, if any, directly with a multimeter Ohm file pressure switch off the situation, no resistance is good, there is bad
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