Features

Air Mix Door Control
The air mix door is automatically controlled so that in-vehicle temperature will reach, and be maintained at the operator selected "set temperature". For a given set temperature, the mix door position will depend on: Ambient temperature, in-vehicle temperature, amount of sunload, and intake air temperature.

Fan Speed Control
The blower speed is automatically controlled, with the actual speed (for a given set temperature) depending on: Ambient temperature, in-vehicle temperature, amount of sunload, intake air temperature, and mix door position. Additionally, when the system is turned on, the blower will start slowly and then increase speed (over a period of approximately 5 seconds) until the objective speed is reached. When cold starting in cold ambient temperatures, the blower operation will be delayed to prevent blowing cold air on the occupants feet.

Intake Door Control
The intake door position will be determined by: Ambient temperature, in-vehicle temperature, and whether the compressor is on or off.

Outlet Door Control
The outlet door position will be determined by: Ambient temperature, in-vehicle temperature, intake air temperature, and amount of sunload.

Compressor Clutch Control
The compressor operation (ON-OFF) is automatically controlled by the ambient sensor to prevent compressor damage in very cold ambient temperatures.

The Electronic Concentrated Control System (ECCS) also considers the input signal from the throttle sensor, and turns the magnet clutch ON or OFF. (Acceleration cut control)

Recirculation Switch
If the operator does not want outside air, the RECIRC switch should be pushed. The passenger compartment air will be recirculated for approx. 10 minutes, then the RECIRC function will be automatically canceled.

Self-diagnostic System
The self-diagnostic system consists of five steps. Each step can be accessed by pushing the switches on the automatic amplifier.

STEP 1: Checks L.E.D.s and segments of the display.
STEP 2: Checks each sensor circuit for open or short circuit.
STEP 3: Checks mode door position.
STEP 4: Checks operation of each actuator.
STEP 5: Checks temperature detected by each sensor.
AUXILIARY TRIMMER MECHANISM: Set temperature trimmer.

Memory Function

When the ignition switch is turned from "ON" to "OFF", the auto amplifier stores the set temperature and inputs of various switches in its memory. When the ignition switch is turned from "OFF" to "ON", the system begins operation with the information stored in the memory, then immediately compensates for the actual operating conditions.

Refrigeration Cycle
Refer to description of the refrigeration cycle.

Fresh Vent
When the fresh vent lever is in the "ON" position, a small amount of air flows directly from the evaporator outlet to the vent (face) duct, bypassing the heater unit. This provides a small amount of cool air in the occupant head/face area even though warm air may be discharging through the foot or defroster outlets.