Mitsubishi 3000GT Service Manual page 1226

55-6
TROUBLESHOOTING
Symptom
Heater insufficient heat
No ventilation even when
mode selection knob is
operated
Blower motor inoperative
Air conditioning does not
operate when the ignition
switch in the ON position
HEATERS AND MANUAL
AIR CONDITIONING
Probable cause
Obstructed heater outlets
Blend air dampers improperly ad-
Thermostat malfunction
Obstructed heater hoses
Improperly adjusted control cables
Plugged or partially plugged heater
core
Incorrect adjustment of mode selec-
tion dampers
Incorrect installation of mode selec-
tion control wire
Ducts are incorrectly/incompletely
connected, crushed, bent or clogged
Burn-out fuse
Poor grounding
Malfunction blower switch
Malfunction resistor
Malfunction blower motor
Malfunction heater relay
Malfunction blower motor relay
Open-circuited power circuit harness
Defective magnet clutch
Defective thermostat
Defective A/C engine coolant temper-
ature switch for air conditioning cut
off <Up to 1993 models>
Defective dual pressure switch
Refrigerant leak
Excessive refrigerant
Defective air conditioning switch
Defective A/C compressor lock con-
troller <DOHC>
I
TSB
Revision
Remedy
Correct
Correct
Replace
Replace
Adjust
Clean or replace
Adjust
Adjust
Repair or replace
Correct
Replace
Replace
Replace
Replace
Replace
Replace
Correct harness
Replace
Replace
Replace
Replace
Charge refrigerant, correct
leak
I
Discharge refrigerant
Replace air conditioning
switch
Replace A/C compressor
lock controller
Ref. page
GROUP 14
55-32
55-29
55-29
55-53
55-45
I
55-33
55-32