cooling MITSUBISHI MONTERO 1991 Owner's Guide

EN G IN E C O OLIN G F A N
1991 M it s u bis h i M onte ro
1991 ENGINE COOLING
Mitsubishi Engine Cooling Fans
Mitsubishi: Eclipse, Galant, Mirage,
Montero, Pickup, Precis, 3000GT
ELECTRIC COOLING FAN - COMPONENT TESTING
MOTOR
Disconnect electric cooling fan motor at junction. Using 2
jumper wires, ground one lead and apply battery voltage to other. Fan
should rotate. If fan does not rotate, replace motor.
RADIATOR FAN SWITCH
Using an ohmmeter, check switch continuity in hot water.
Switch should be open at less than 180F (82C) and continuity should
exist at more than 185F (85C). Replace radiator fan switch if it
does not test as specified.
ELECTRIC COOLING FAN RELAY
1) Remove relay from relay box in front of right suspension
tower. Using jumper wires, connect battery to indicated terminals.
2) On 3000GT, continuity should exist between terminals No. 1
and 3. With battery disconnected, continuity should exist between
terminals No. 2 and 4 and should not exist between terminals No. 1 and
3.
3) On all other models, continuity should exist between
terminals No. 3 and 4. With battery disconnected, continuity should
exist between terminals No. 1 and 2 and should not exist between
terminals No. 3 and 4. Replace relay if it does not test as specified.
Fig. 1: Testing Electric Cooling Fan Relay (except 3000GT)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 2: Testing Electric Cooling Fan Relay (3000GT)
Courtesy of Mitsubishi Motor Sales of America.
ELECTRIC COOLING FAN - SYSTEM TESTING
MIRAGE 1.5L
1) With A/C on LOW position, ignition on and engine coolant
temperature greater than 185F (85C), thermosensor completes path to
ground, closing radiator fan motor relay contacts and providing
current to radiator fan motor. See Fig. 1.
2) With A/C on HIGH position and ignition on, power supply
from automatic compressor control unit causes condenser fan motor
relay and condenser fan motor control relay to turn on, causing
condenser fan and radiator cooling fan to operate.

MIRAGE 1.6L
1) With A/C on LOW position, ignition on and engine coolant
temperature greater than 185F (85C), thermosensor completes path to
ground, closing radiator fan motor relay contacts and providing
current to radiator fan motor. See Fig. 2.
2) With A/C on HIGH position and ignition on, power supply
from auto compressor control unit causes condenser fan motor relay to
turn on, causing condenser fan and radiator cooling fan to operate at
a low speed by usage of a resistor.
3) If pressure switch is activated by excessive pressure or
if thermosensor is on when engine coolant temperature exceeds 185
F
(85C), condenser fan motor control relay is activated, causing
condenser fan and radiator cooling fan to operate at a high speed.
ECLIPSE & 3000GT
With ignition on and engine coolant temperature greater than
185F (85C), thermosensor completes path to ground, closing radiator
fan motor relay contacts and providing current to radiator fan. See
Figs. 7 -11.
WIRING DIAGRAMS
For addition wiring diagrams, see appropriate chassis wiring
diagrams in WIRING DIAGRAMS.

Fig. 3: Radiator Cooling Fan Wiring Diagram (Mirage 1.5L)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 4: Radiator Cooling Fan Wiring Diagram (Mirage 1.6L)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 5: Radiator Cooling Fan Wiring Diagram (Eclipse)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 6: Radiator Cooling Fan Wiring Diagram (Galant AWD A/T)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 7: Radiator Cooling Fan Wiring Diagram (Galant FWD & AWD M/T)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 8: Radiator Cooling Fan Wiring Diagram (3000GT)
Courtesy of Mitsubishi Motor Sales of America.

CLUTCH PEDAL POSITION SWITCHES
COLD START INJECTORS
CONNECTORS
COOLANT
COOLANT RECOVERY TANKS
COOLING FAN MOTOR MODULES
COOLING FAN MOTOR RELAYS AND MODULES
COOLING FAN MOTOR RESISTORS
COOLING FAN MOTOR SENSORS AND SWITCHES
COOLING FAN MOTOR SWITCHES
COOLING FAN MOTORS
CRANKSHAFT POSITION SENSORS
DECEL VALVES
DEFLECTORS
DIP STICKS AND TUBES
DIP STICK TUBES
DISTRIBUTOR ADVANCES AND RETARDERS (MECHANICAL AND VACUUM)
DISTRIBUTOR BOOTS AND SHIELDS
DISTRIBUTOR CAPS
DISTRIBUTOR RETARDERS (MECHANICAL AND VACUUM)
DISTRIBUTOR ROTORS
DISTRIBUTOR SHIELDS
DISTRIBUTORS
EARLY FUEL EVAPORATION VALVES (HEAT RISER ASSEMBLIES)
EGR COOLERS
EGR EXHAUST MANIFOLD PASSAGES
EGR INTAKE AND EXHAUST MANIFOLD PASSAGES
EGR PLATES AND COOLERS
ELECTRONIC SPARK CONTROL MODULES
ELECTRONIC TRANSMISSION CONTROL DEVICES
ELECTRONIC TRANSMISSION FEEDBACK DEVICES
ENGINE COOLANT TEMPERATURE SENSORS
ENGINE COOLING SYSTEMS
ENGINE COVERS (OIL PAN, VALVE COVER, TIMING COVER)
ENGINE OIL
ENGINE OIL CANISTERS
ENGINE OIL COOLERS (EXTERNAL)
ENGINE OIL DRAIN PLUGS AND GASKETS
ENGINE OIL FILTERS AND CANISTERS
ENGINE OIL GASKETS
ENGINE OIL PRESSURE GAUGES (MECHANICAL)
EVAPORATIVE EMISSION (EVAP) CANISTER FILTERS
EVAPORATIVE EMISSION (EVAP) CANISTER PURGE DEVICES
EVAPORATIVE EMISSION (EVAP) CANISTERS
EVAPORATIVE EMISSION (EVAP) FEEDBACK DEVICES
EXHAUST GAS RECIRCULATION DEVICES
EXHAUST GAS RECIRCULATION FEEDBACK DEVICES
EXPANSION PLUGS
FAN CONTROL SENSORS
FUEL
FUEL ACCUMULATORS AND DAMPERS
FUEL AND COLD START INJECTORS
FUEL DAMPERS
FUEL DELIVERY CHECK VALVES
FUEL DISTRIBUTORS (BOSCH CIS)
FUEL FILLER NECKS AND RESTRICTORS
FUEL FILTERS
FUEL INJECTORS
FUEL LEVEL SENDERS7
FUEL PRESSURE REGULATORS
FUEL PUMPS (IN-TANK AND EXTERNAL, ELECTRICAL OR MECHANICAL)
FUEL RAILS
FUEL RESTRICTORS