A/C System Operation Diagram/Description

GENERAL INFORMATION




The heater system uses a two-way-flow full-air-mix system that features high performance and low operating noise, and includes an independent face air blowing function and a cool air bypass function.

The A/C system is basically the same as the conventional system, but a new refrigerant system has been adopted as a response to restrictions on the use of chlorofluorocarbons.

OPERATION

Compressor control
- The fin thermo sensor, which senses the temperature of the air flowing out of the evaporator, are deactivated with temperature -2 °C (28 °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.
- When these two sensors are all activated, the dual pressure switch is ON, and the ignition switch, blower switch, and air conditioning switch or defroster switch are ON, the A/C compressor relay is energized.




A/C Compressor Relay ON Conditions