Condenser Fan: Description and Operation

Condenser fan and radiator fan control
- For the operation of each fan, see COOLING CIRCUIT.

Compressor control
- The refrigerant temperature switch, which senses the temperature of the refrigerant, is deactivated with temperature 155°C (311°F) or higher.

- When the air conditioning switch is set to the DRY" mode, the air thermo sensor detects the temperature of the air emitted from the evaporator; the A/C compressor clutch relay is switched OFF if the temperature is 2.2°C (36°F) or lower. Furthermore, when the air conditioning switch is set to the "ECONO" mode, the A/C compressor clutch relay is switched off at temperatures of 7°C (45°F) or below.

- The dual pressure switch turns OFF when the refrigerant pressure becomes excessively high or low, thus protecting the compressor circuit. (See Table below.)

- The air conditioning compressor clutch relay is energized when the refrigerant-temperature switch, the air thermo sensor are ON, and the dual-pressure switch is ON, and the ignition switch, blower switch and air conditioning switch are all ON.

- However, note that the air conditioning compressor clutch relay is switched OFF when starting and during low rpm operation until a certain fixed time has passed, depending upon the running conditions, in order to prevent engine stall and engine vibrations.

Air Conditioning Compressor Clutch Relay ON Conditions:

Air Conditioning Compressor Clutch Relay ON Conditions
If any one of the switches, sensors or the control unit is OFF the air conditioning compressor clutch relay will turn OFF.