Compressor Control

- The air inlet sensor which senses the temperature of the air sent to the evaporator, and the air thermo sensor, which senses the temperature of the air flowing out of the evaporator, are deactivated with temperature 3.2°C (38°F) or below.
Here, the engine coolant temperature sensor senses the temperature of engine coolant, and it is turned off at 115°C (239°F) or higher temperatures
- The dual pressure switch turns OFF when the refrigerant pressure becomes excessively high or low, thus protecting the compressor circuit.

A/C Compressor Relay ON Conditions:

- When these three sensors are all activated, the dual pressure switch is ON, and the ignition switch, blower switch, and air conditioning switch are ON, the A/C compressor relay is energized.