To operate the A/C normally or to reduce the damage to the components when a malfunction occurs, the signals from each sensor or switch are sent to the A/C amplifier in order to control the A/C.
(1)Pressure switch control:
This detects the abnormal rise of refrigerant pressure and turns off the magnetic clutch to protect the components in the refrigeration cycle and stops the compressor from operating.
(2)Evaporator temperature control:
This detects the surface temperature of the evaporator, and turns the magnetic clutch on and off to control the operation of the compressor so that the evaporator does not frost.
(3)Drive belt protection system:
This detects the lock of the compressor, prevents the drive belt from being damaged by turning off the magnetic clutch, and causes the A/C switch indicator light to blink.
(4)Compressor two-stage control system:
This controls the utilization rate of the compressor and improves fuel economy and driveability.
(5)Dual A/C (rear cooler) control:
This turns the magnetic valve on and off to control the dual refrigerant circuits.
This stabilizes the engine idling when the A/C is on.
(7)Electric fan control:
This controls the electric fan and improves the cooling capability and fuel economy and reduces noise.