Troubleshooting - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

HEATER, AIR CONDITIONER AND VENTILATION

TROUBLESHOOTING

TROUBLESHOOTING PROCEDURES
Trouble symptom Problem cause
When the ignition Fuse is defective
switch is "ON" switch is "ON",
Harness or connector is defective
the A/C does not
operate operate
A/C compressor relay is defective
A/C compressor magnetic clutch is defective
Refrigerant leak or overfilling of refrigerant
Dual pressure switch is defective
A/C switch is defective
Blower switch is defective
Refrigerant temperature switch is defective
Automatic compressor-ECU is defective
Engine-ECU is defective
When the A/C is Refrigerant leak
operating, tem-
perature perature inside inside
Dual pressure switch is defective
the passenger
compartment compartment
Refrigerant temperature switch is defective
doesn't decrease
(cool air is not
emitted) emitted)
Automatic compressor-ECU is defective
Engine-ECU is defective
Blower fan and Fuse is defective
motor do not turn motor do not turn
Harness or connector is defective
Blower relay is defective
Blower fan and motor are defective
Resistor (for blower motor) is defective
Blower switch is defective
–
Troubleshooting
Remedy
Replace the fuse
Repair the harness or connector
Replace the A/C compressor
relay
Replace the armature plate, rotor
or clutch coil
Replenish the refrigerant, repair
the leak or take out some of the
refrigerant
Replace the dual pressure switch
Replace the blower switch as-
sembly
Replace the blower switch as-
sembly
Replace the refrigerant tempera-
ture switch
Replace the automatic compres-
sor-ECU
Replace the Engine-ECU
Replenish the refrigerant and
repair the leak
Replace the dual pressure switch
Replace the refrigerant tempera-
ture switch
Replace the automatic compres-
sor-ECU
Replace the engine-ECU
Replace the fuse
Repair the harness or connector
Replace the blower relay
Replace the blower fan and
motor
Replace the resistor
Replace the blower switch as-
sembly
55-5
55200070297
Reference
page
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55-16
55-29
55-15
55-31
55-20
55-20
55-29
55-25
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55-15
55-31
55-29
55-25
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55-16
55-22
55-22
55-20