1989-Mitsu-Factory Manual · AC system · страница 18 из 42 · Открыть оригинал PDF ↗
(6) Reconnect boot on switch and perform step number 3.
If the clutch does not engage, discharge the system,
replace the switch, and-recharge the system.
(7) If the magnet clutch switches OFF during driving even
though the temperature inside the vehicle has not de-
creased, it is possible that the high-pressure side of the
dual-pressure switch has activated.
(8) install a manifold gauge-and then drive the vehicle and
read the value at which the magnet clutch is switched
OFF.
(9) If the value at which the magnet clutch is switched OFF is
2,700 kPa (384 psi) or less. there is an incorrect setting of
the dual-pressure switch, and replacement must be made.
FREEZE UP CONTROL
Evaporator freeze up is controlled by a thermistor attached to
the evaporator fins. The control is an electronic type and
consists of two parts (therm0 relay and thermistor). It is
connected to the magnetic clutch of the compressor in series.
When the temperature of the evaporator drops below 3°C
(37.4”F), the compressor is turned OFF.
To Test the Thermistor
(1) Jump the wire lead (LB to GB) of the connector portion.
(2) Press the air conditioner switch and blower switch on.
(3) Momentarily turn the ignition switch on (do not crank the
engine), listen for the clutch engaging.
(4) If the clutch does not engage, the dual pressure switch,
engine coolant temperature switch wiring or fuse may be
faulty.
(5) If the clutch operates, replace the thermostat.
ENGINE COOLANT TEMPERATURE SWITCH
The engine coolant temperature switch is located on the
thermostat housing. The engine coolant temperature switch
is connected to the clutch in series. When the coolant
temperature in the radiator reaches above 113°C (235”F), it
turns the compressor OFF.
This is to prevent engine overheating.
When the engine coolant temperature switch is activated and
the clutch is OFF, check the surface of the condenser and
radiator, the belt tension, and the coolant volume in the
radiator, and return.to the normal condition.
To Test the Engine Coolant Temperature Switch
(1) Remove wire from engine coolant temperature switch and
jump lead wires.
(2) Press the air conditioner switch and blower switch on.
(3) Momentarily turn the ignition switch on (do not crank the
engine), listen for the clutch engaging.
(4) If the clutch does not engage, the fin thermistor, dual- :
pressure switch, wiringor fuse may be faulty.
(5) If clutch engages, replace the switch.
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