Heating and Air Conditioning: Description and Operation

GENERAL DESCRIPTION
The heater system uses a two-way-flow full-air-mix system that features high performance and low operating noise. It includes an independent face air blowing function. In addition, an air purifier has been included.

OPERATION:

CONDENSER FAN AND RADIATOR FAN CONTROL
For the operation of each fan, refer to Diagnosis - Symptom Chart.

COMPRESSOR CONTROL
When operating the air conditioning switch
- The air thermo sensor, which senses the temperature of the air flowing out of the evaporator, deactivates the compressor at 3.2 °C (37.7 °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.)
- When the air thermo sensor is 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.

A/C Compressor Relay On Conditions:

When operating the air outlet changeover control knob
When the air outlet changeover control knob is moved to DEFROSTER or DEFROSTER/FOOT position, the defroster switch, which is connected in series to the air conditioning switch, is turned on. Compressor controls other than the above are the same as when operating the air conditioning switch.