Mitsubishi 3000GT Service Manual page 1277

FULL AUTO AIR CONDITIONING - Troubleshooting
No.
Symptom
3 Interior temperature
does not lower
(No cold air coming
out).
4 Blower motor does not
rotate.
Probable cause
Defective blend air damper drive mo-
tor
Incorrect engagement of blend air
damper drive motor lever and blend
air damper
Sticking blend air damper
Open-circuited harness between
blend air damper drive motor and air
conditioning control unit
Open-circuited harness between
photo sensor and air conditioning
control unit
Defective air-conditioning compres-
sor relay in the relay box
Defective thermostat
Defective revolution pick up sensor
Refrigerant leak
Excessive refrigerant
Clogged receiver
Clogged expansion valve
Defective compressor
Defective air inlet sensor
Defective magnetic clutch
Defective A/C compressor lock con-
troller
Defective control panel
Defective air conditioning control unit
Defective blower motor
Blown thermal fuse inside air condi-
tioning power transistor
Defective blower motor relay
Open-circuited harness between fuse
and blower motor relay
Open-circuited harness between
blower motor relay and blower motor
Open-circuited harness between air
conditioning power transistor and air
conditioning control unit
Defective control panel
Defective air conditioning control unit
Revision
TSB
Remedy
Replace blend air damper
drive motor.
Engage correctly.
Correct blend air damper.
Correct harness.
Correct harness.
Replace.
Replace thermostat.
Replace revolution pick
up sensor.
Charge refrigerant, car-
Discharge refrigerant. -
Replace receiver.
Replace expansion valve.
Replace compressor.
Replace air inlet sensor.
Replace.
Replace A/C compressor
lock controller.
Replace control panel.
Replace air conditioning
control unit.
Replace blower motor.
Replace air conditioning
power transistor.
Replace blower motor
relay.
Correct harness.
Correct harness.
Correct harness.
Replace control panel.
Replace air conditioning
control unit.
Ref. page
55-48
55-38
55-39
55-77
55-74
55-73
55-35
55-29
55-73
55-73