Colt L4-1795cc 1.8L SOHC (1994)
Condenser Fan: Description and Operation
Condenser fan and radiator fan control
- For the operation of each fan, see COOLING CIRCUIT.
Compressor control
- The refrigerant temperature switch, which senses the temperature of the refrigerant, is deactivated with temperature 155°C (311°F) or higher.
- When the air conditioning switch is set to the "DRY" mode, the air thermo sensor detects the temperature of the air emitted from the evaporator;
the A/C compressor clutch relay is switched OFF if the temperature is 2.2°C (36°F) or lower. Furthermore, when the air conditioning switch is set
to the "ECONO" mode, the A/C compressor clutch relay is switched off at temperatures of 7°C (450°F) or below.
- 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 triple pressure switch turns OFF when the refrigerant pressure becomes excessively high or low, thus protecting the compressor circuit. (See
Table below.)
- The air conditioning compressor clutch relay is energized when the refrigerant-temperature switch, the air thermo sensor are ON, and the triple
pressure switch is ON, and the ignition switch, blower switch and air conditioning switch are all ON.
- However, note that the air conditioning compressor clutch relay is switched OFF when starting and during low rpm operation until a certain fixed
time has passed, depending upon the running conditions, in order to prevent engine stall and engine vibrations. In addition, for 4-speed automatic
transaxle models, when the throttle valve opening is large (throttle-position sensor output voltage approximately 4 V and throttle valve
opening approximately 650 or greater) during acceleration, the air conditioning compressor clutch relay drive transistor (located within the
engine control module) is switched OFF for about five seconds and the air conditioning compressor clutch relay is switched OFF in order to
maintain acceleration performance.
Air Conditioning Compressor Clutch Relay ON Conditions
Air Conditioning Compressor Clutch Relay ON Conditions
If any one of the switches, sensors or the control unit is OFF, the air conditioning compressor clutch relay will turn OFF.
