radiator MITSUBISHI MONTERO 1998 User Guide
Page 285 of 1501
3) If radiator fan and condenser fan operate in all speeds
except high, check appropriate high speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If high speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 1997
* G - TESTS W/CODES - 1998
4) To confirm radiator fan or condenser fan operation, see
appropriate FAN OPERATING MODE (GALANT) table. If fan operation is not\
as specified, check wiring harness for opens or shorts. Repair as
necessary.
FAN OPERATING MODE (GALANT) ( 1)
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Coolant Radiator Condenser
Temp. F (C) Fan Speed Fan Speed
28 MPH ( 2)
203 (95) ( 2) ................ Off .......................... Off
203-221 (95-105) ............ Low .......................... Low\
221 (105) ( 3) .............. High ......................... High
28-50 MPH
194 (90) ( 2) ................ Off .......................... Off
194-221 (90-105) ............ Low .......................... Low\
221 (105) ( 3) .............. High ......................... High
50 MPH ( 3)
221 (105) ( 2) ............... Off .......................... Off
221 (105) ( 3) .............. High ......................... High
Any Speed ( 4)
221 (105) ( 2) ............... Low .......................... Low
221 (105) ( 3) .............. High ......................... High
( 1) - A/C request switch is turned off.
( 2) - Approximate vehicle speed/coolant temperature or less.
( 3) - Approximate vehicle speed/coolant temperature or more.
( 4) - A/C request switch is turned on.
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NOTE: Operation of radiator and condenser fans is controlled by
vehicle Powertrain Control Module (PCM). Based on vehicle
speed, coolant temperature and A/C operation request, PCM
will command low, medium or high speed fan operation.
Mirage
1) If only the radiator fan does not operate, check fusible
link No. 5 (30-amp) located in engine compartment relay box. If only
the condenser fan does not operate, check fusible link No. 2 (100-amp)\
and dedicated fuse No. 1 (25-amp) located in engine compartment relay
box. See WIRING DIAGRAMS . Repair as necessary.
2) If fusible links and dedicated fuse are okay, check
appropriate fan relay and/or fan motor for proper operation. See
COMPONENT TESTS. See WIRING DIAGRAMS. If fan relay and motor are okay,
check PCM. See appropriate G - TESTS W/CODES article in ENGINE
PERFORMANCE.
* G - TESTS W/CODES - 1.5L - 1997
* G - TESTS W/CODES - 1.8L - 1997
* G - TESTS W/CODES - 1998
3) To confirm radiator fan or condenser fan operation, see
appropriate FAN OPERATING MODE (MIRAGE) table. If fan operation is not\
as specified, check wiring harness for opens or shorts. Repair as
Page 286 of 1501
necessary.
FAN OPERATING MODE (MIRAGE)
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Power Circuit
Coolant Operating Radiator Condenser
Temp.
F (C) RAD/COND Fan Speed Fan Speed
203 (95) ( 1) ( 2) ...... Off/Off ....... Off ................ Off
203-221 (95-105) ( 1) ... On/Off ........ On ................ Off
221 (105) ( 1) ( 3) ...... On/On ......... On ................. On
All Temp. ( 4) .......... On/On ......... On ................. On
( 1) - A/C request switch is turned off.
( 2) - Approximate coolant temperature or less.
( 3) - Approximate coolant temperature or more.
( 4) - A/C request switch is turned on.
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NOTE: Operation of radiator and condenser fans is controlled by
vehicle Powertrain Control Module (PCM). Based on vehicle
speed, coolant temperature and A/C operation request, PCM
will command low, medium or high speed fan operation.
3000GT
1) If neither the radiator fan nor the condenser fan operate,
check fusible link No. 5 (40-amp). See WIRING DIAGRAMS. If only the
condenser fan does not operate, check dedicated fuse No. 8 (20-amp).
2) If the condenser fan operates in all speeds except low and
A/C compressor clutch does not enter the ON state, check for A/C
compressor lock controller unit output signal. If the A/C compressor
clutch does enter the ON state, check condenser fan low speed relay
operation.
3) If the radiator fan and the condenser fan operate in all
speeds except high, check PCM. See appropriate G - TESTS W/CODES
article in ENGINE PERFORMANCE. If fan operation is not as specified,
check wiring harness for opens or shorts. Repair as necessary.
* G - TESTS W/CODES - NON-TURBO - 1997
* G - TESTS W/CODES - TURBO - 1997
* G - TESTS W/CODES - 1998
4) To confirm radiator fan or condenser fan operation, see
appropriate FAN OPERATING MODE (3000GT) table. If fan operation is not\
as specified, check wiring harness for opens or shorts. Repair as
necessary.
FAN OPERATING MODE (3000GT)
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Power Circuit
Coolant Operating Radiator Condenser
Temp.
F (C) Low/High Fan Speed Fan Speed
50 MPH ( 1) ( 2)
203 (95) ( 2) ........ Off/Off ....... Off ................ Off
203-221 (95-105) ..... On/Off ....... Low ................ Off\
221 (105) ( 3) ........ On/On ........ High .............. High
50 MPH ( 1) ( 3)
221 (105) ( 2) ....... Off/Off ....... Off ................ Off
221 (105) ( 3) ........ On/On ........ High .............. High
All Speeds
221 (105) ( 2) ........ On/Off ....... Low ................ Low
221 (105) ( 3) ........ On/On ........ High .............. High
Page 590 of 1501
FUEL TANKS
GAS CAPS
GASKETS
GROMMETS (VALVE COVER)
HARMONIC DAMPERS
HEATER CONTROL VALVES
HEATER CORES
HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS
HOSE CLAMPS
HOSE CONNECTORS
HOSE COUPLERS
HOSES AND TUBES (FUEL LINES, RADIATOR, VACUUM, BY PASS,
HEATER, RECOVERY TANK AND OIL COOLERS)
HOUSINGS
IDLE AIR CONTROLS
IDLE SPEED CONTROL ACTUATORS
IGNITION BOOTS
IGNITION COIL TOWERS
IGNITION COILS
IGNITION CONTROL MODULES (ICM)
IGNITION SWITCHES
IGNITION TERMINALS
IGNITION WIRES, BOOTS, COIL TOWERS AND TERMINALS (SECONDARY)
IN-TANK FUEL STRAINERS
INERTIA FUEL SHUT-OFF SWITCHES
INTAKE AIR TEMPERATURE SENSORS
INTAKE MANIFOLDS
INTERCOOLERS
KNOCK SENSORS
LIQUID VAPOR SEPARATORS
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSORS
MASS AIR FLOW (MAF) SENSORS
METAL AIR MANIFOLDS AND PIPES
METAL AIR PIPES
MIX CONTROL SOLENOIDS
MOTOR MOUNTS
O-RINGS, GASKETS, SEALS AND SPRING LOCKS
O2 SENSORS
OIL PRESSURE SENDING UNITS
OIL PUMP PICK-UP SCREENS
OIL PUMPS
PARK NEUTRAL POSITION SWITCHES
PCV BREATHER ELEMENTS
PCV ORIFICES
PCV VALVES
PICK-UP ASSEMBLIES (INCLUDES MAGNETIC, HALL EFFECT AND
OPTICAL)
POWER STEERING PRESSURE SENSORS
POWERTRAIN CONTROL MODULES (PCM) AND PROM
POWERTRAIN CONTROL PROM
PRESSURIZED EXPANSION TANK CAPS
RADIATOR CAPS AND PRESSURIZED EXPANSION TANK CAPS
RADIATOR FAN BLADES
RADIATOR FAN CLUTCHES
RADIATORS
ROLL OVER VALVES
SEALING COMPOUNDS
SEALS
SECONDARY AIR INJECTION SYSTEM MANAGEMENT DEVICES
SENSORS AND ACTUATORS
SHROUDS, BAFFLES AND DEFLECTORS
SPARK PLUGS
SPRING LOCKS
Page 647 of 1501
affecting performance .. A .. Require repair or replacement.
Leaking ................. A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
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HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS
NOTE: When replacing fuel lines and hoses, replace with product
that meets or exceeds OEM design specifications.
HOSE AND TUBE COUPLER, CONNECTOR AND CLAMP INSPECTION
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Condition Code Procedure
Application incorrect ... B ............ Require replacement.
Connected incorrectly ... A ................. Require repair.
Corroded, not reusable .. 1 ............ Suggest replacement.
Cracked ................. A ............ Require replacement.
Insufficient clamping
force, allowing hose to
leak ................... A .. Require repair or replacement.
Leaking ................. A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Safety clip missing (not
leaking) ............... C ... Require replacement of safety
clip.
Stripped ................ A ............ Require replacement.
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HOSE CLAMPS
See HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS .
HOSE CONNECTORS
See HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS .
HOSE COUPLERS
See HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS .
HOSES AND TUBES (FUEL LINES, RADIATOR, VACUUM, BY PASS,
HEATER, RECOVERY TANK AND OIL COOLERS)
HOSE AND TUBE (FUEL LINE, RADIATOR, VACUUM, BY PASS, HEATER,
RECOVERY TANK AND OIL COOLER) INSPECTION
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Condition Code Procedure
Application incorrect ... B ............ Require replacement.
Connected incorrectly ... A ................. Require repair.
Corroded, not reusable .. 1 ............ Suggest replacement.
Cracked ................. A ............ Require replacement.
Dry-rotted .............. 1 .. Suggest repair or replacement.
Hard .................... 1 .. Suggest repair or replacement.
Inner fabric (webbing)
damaged ................ A ............ Require replacement.
Insufficient clamping
force, allowing hose to
leak ................... A .. Require repair or replacement.
Leaking ................. A .. Require repair or replacement.
Maintenance intervals ... 3 ............ Suggest replacement.
Page 669 of 1501
Terminal burned, affecting
performance ............ A ........... (2) Require repair or
replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Wire lead conductors
exposed ................ B .. Require repair or replacement.
Wire lead corroded ...... A .. Require repair or replacement.
Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
( 1) - Refer to manufacturer's diagnostic trouble code
procedure and require repair or replacement of affected
component(s).
( 2) - Determine cause and correct prior to repair or
replacement of part.
( 3) - Determine source of contamination, such as engine coolant,
fuel, metal particles, or water. Require repair or
replacement.
( 4) - Includes inoperative, intermittent operation, failure to
perform all functions, or out of OEM specification.
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POWERTRAIN CONTROL PROM
See POWERTRAIN CONTROL MODULES (PCM) AND PROM .
PRESSURIZED EXPANSION TANK CAPS
See RADIATOR CAPS AND PRESSURIZED EXPANSION TANK CAPS .
RADIATOR CAPS AND PRESSURIZED EXPANSION TANK CAPS
RADIATOR CAP AND PRESSURIZED EXPANSION TANK CAP INSPECTION \
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Condition Code Procedure
Application incorrect ... B ........... Require replacement.
Coolant recovery check
valve inoperative ...... A ....... ( 1) Require replacement.
Fails to maintain proper
pressure ............... B ........... Require replacement.
Gasket missing .......... C . Require replacement of gasket.
Missing ................. C ........... Require replacement.
Seal missing ............ C ... Require replacement of seal.
( 1) - Inoperative includes intermittent operation or out of
OEM specification.
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RADIATOR FAN BLADES
Page 670 of 1501
RADIATOR FAN BLADE INSPECTION \
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Condition Code Procedure
Application incorrect ... B ........... Require replacement.
Attaching hardware
broken ................. A .. Require repair or replacement
of hardware.
Attaching hardware
missing ................ C ......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A .. Require repair or replacement
of hardware.
Bent .................... A ........... Require replacement.
Broken .................. A ........... Require replacement.
Cracked ................. A ........... Require replacement.
Loose ................... A . Require repair or replacement.
Missing ................. C ........... Require replacement.
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RADIATOR FAN CLUTCHES
NOTE: Some lateral movement, measured at the fan blade tip,
may be normal.
RADIATOR FAN CLUTCH INSPECTION
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Bearing noisy ........... A ............ Require replacement.
Bearing worn ............ A ............ Require replacement.
Fastener loose .......... A ... Require repair or replacement
of fastener.
Inoperative ............. A ........ ( 1) Require replacement.
Leaking ................. 1 ............ Suggest replacement.
Seized .................. A ............ Require replacement.
Slips (insufficient fan
speed) ................. A ............ Require replacement.
Thermal control
incorrect .............. B .. Require repair or replacement.
( 1) - Inoperative includes intermittent operation or out of
OEM specification.
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RADIATOR INSPECTION \
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Condition Code Procedure
Air flow restriction .... A ................. Require repair.
Page 685 of 1501
check for accepted cleaning procedure. \
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TUBE CLAMPS
See HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS .
TUBE CONNECTORS
See HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS .
TUBE COUPLERS
See HOSE AND TUBE COUPLERS, CONNECTORS AND CLAMPS .
TUBES
See HOSES AND TUBES (FUEL LINES , RADIATOR, BY PASS, HEATER,
RECOVERY TANK AND OIL COOLERS).
TURBO CHARGERS
TURBO CHARGER INSPECTION \
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Boost pressure
incorrect .............. A ........... ( 1) Require repair or
replacement.
Leaking ................. A .. Require repair or replacement.
Noisy ................... 2 .. Suggest repair or replacement.
Oil seal (internal)
leaking ................ A .. Require repair or replacement.
Vibrates ................ A .. Require repair or replacement.
( 1) - Boost pressure problems may be caused by other systems
or components.
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VACUUM CONNECTIONS
See VACUUM HOSES, TUBES AND CONNECTIONS (NON-METALLIC) .
VACUUM HOSES, TUBES AND CONNECTIONS (NON-METALLIC)
VACUUM HOSE, TUBE AND CONNECTION (NON-METALLIC) INSPECTION \
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Condition Code Procedure
Leaking ................. A .. Require repair or replacement.
Melted .................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Oil-soaked (spongy) ..... 1 ............ Suggest replacement.
Page 777 of 1501
GENERAL COOLING SYSTEM SERVICING
1998 Mitsubishi Montero
GENERAL INFORMATION
General Cooling System Servicing
* PLEASE READ THIS FIRST *
The following article is for general information only.
Information may not apply to all years, makes and models. See specific
article in the ENGINE COOLING section.
DESCRIPTION
The basic liquid cooling system consists of a radiator, water
pump, thermostat, electric or belt-driven cooling fan, pressure cap,
heater, and various connecting hoses and cooling passages in the block
and cylinder head.
MAINTENANCE
DRAINING
Remove radiator cap and open heater control valve to maximum
heat position. Open drain cocks or remove plugs in bottom of radiator
and engine block. In-line engines usually have one plug or drain cock,
while "V" type engines will have 2, one in each bank of cylinders.
CLEANING
A good cleaning compound removes most rust and scale. Follow
manufacturer's instructions in the use of cleaner. If considerable
rust and scale has to be removed, cooling system should be flushed.
Clean radiator air passages with compressed air.
FLUSHING
CAUTION: Some manufacturers use an aluminum and plastic radiator.
Flushing solution must be compatible with aluminum.
Back Flushing
Back flushing is an effective means of removing cooling
system rust and scale. The radiator, engine and heater core should be
flushed separately.
Radiator
To flush radiator, connect flushing gun to water outlet of
radiator and disconnect water inlet hose. To prevent flooding engine,
use a hose connected to radiator inlet. Use air in short bursts to
prevent damage to radiator. Continue flushing until water runs clear.
Engine
To flush engine, remove thermostat and replace housing.
Connect flushing gun to water outlet of engine. Flush using short air
bursts until water runs clean.
Heater Core
Flush heater core as described for radiator. Ensure heater
control valve is set to maximum heat position before flushing heater.
Page 778 of 1501
REFILLING
To prevent air from being trapped in engine block, engine
should be running when refilling cooling system. After system is full,
continue running engine until thermostat is open, then recheck fill
level. Do not overfill system.
TESTING
THERMOSTAT
1) Visually inspect thermostat for corrosion and proper
sealing of valve and seat. If okay, suspend thermostat and thermometer
in a 50/50 mixture of coolant and water. See Fig. 1. Do not allow
thermostat or thermometer to touch bottom of container. Heat water
until thermostat just begins to open.
2) Read temperature on thermometer. This is the initial
opening temperature and should be within specification. Continue
heating water until thermostat is fully open and note temperature.
This is the fully opened temperature. If either reading is not to
specification, replace thermostat.
Fig. 1: Testing Thermostat in Anti-Freeze/Water Solution
PRESSURE TESTING
A pressure tester is used to check both radiator cap and
Page 779 of 1501
complete cooling system. Test components as follows, following tool
manufacturer's instructions.
Radiator Cap
Visually inspect radiator cap, then dip cap into water and
connect to tester. Pump tester to bring pressure to upper limit of cap
specification. If cap fails to hold pressure, replace cap.
Fig. 2: Testing Radiator Pressure Cap
Cooling System
1) With engine off, wipe radiator filler neck seat clean.
Fill radiator to correct level. Attach tester to radiator and pump
until pressure is at upper level of radiator rating.
2) If pressure drops, inspect for external leaks. If no leaks
are apparent, detach tester and run engine until normal operating
temperature is reached. Reattach tester and observe. If pressure
builds up immediately, a possible leak exists from a faulty head
gasket or crack in head or block.
NOTE: Pressure may build up quickly. Release any excess pressure
or cooling system damage may result.
3) If there is no immediate pressure build up, pump tester to
within system pressure range (on radiator cap). Vibration of gauge
pointer indicates compression or combustion leak into cooling system.
Isolate leak by shorting each spark plug wire to cylinder block. Gauge
pointer should stop or decrease vibration when leaking cylinder is
shorted.