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 5 °C (41.0 °F) or below.
The dual pressure switch turns OFF when the refrigerant pressure becomes excessively high or low, thus protecting the compressor circuit.
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. The other compressor control than the above is the same as that when operating the air conditioning switch.
Idle-Up Operation Check
Before inspection and adjustment, set vehicle in the following condition:
Engine coolant temperature: 80 – 90 °C (176.0 – 194.0 °F)
Lights, electric cooling fan and accessories: Set to OFF
Transmission: Neutral (“N” or “P” for vehicles with A/T)
Steering wheel: Straightforward
Check whether or not the idle speed is the standard value. Refer to On-vehicle Service – Basic Idle Speed Adjustment. Standard value: 700 ±100 r/min
When the A/C is running after turning the A/C switch to ON, and the blower switch to the 3(MH) or 4(HI) position, check to be sure that the idle speed is at the standard value. Standard value: 850 ±100 r/min NOTE: The engine control module /the powertrain control module determines whether the A/C load is low or high according to the output signal from the automatic compressor controller. NOTE: It is not necessary to make an adjustment, because the idling speed is automatically adjusted by the ISC system. If, however, a deviation from the standard value occurs for some reason, check the ISC system. NOTE: Check 4 minutes after idling begins.
Technical Service Bulletins
05-55-004 12/01/2005 A/C – Poor Heater Performance in Extreme Cold
05-55-003 12/01/2005 A/C – Temperature Knob Hard to Turn
04-55-008 09/01/2004 A/C – Water Leaks to The Interior
03-51-001 01/01/2003 A/C – Blower Motor Failure
02-55-005 07/01/2002 A/C – Musty/Moldy Odors In Passenger Compartment