Mitsubishi Outlander XL. Manual - part 428

SEALANT

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Item

Specified sealant

Engine coolant temperature sensor

3M™ AAD Part No.8731 or equivalent

ENGINE COOLING DIAGNOSIS

INTRODUCTION

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The  system  cools  the  engine  so  that  it  does  not
overheat  and  maintains  the  engine  at  an  optimum
temperature.  The  system  components  are  the
radiator,  water  pump,  thermostat,  condenser  fan

assembly.  Possible  faults  include  low  coolant,
contamination,  belt  loosening  and  component
damage.

TROUBLESHOOTING STRATEGY

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Use  these  steps  to  plan  your  diagnostic  strategy.  If
you follow them carefully, you will be sure to find most
of the engine cooling faults.

1.

Gather information from the customer.

2.

Verify that the condition described by the customer
exists.

3.

Find  and  repair  the  malfunction  by  following  the
SYMPTOM CHART.

4.

Verify that the malfunction is eliminated.

SYMPTOM CHART

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Symptom

Inspection
procedure

Reference page

Coolant leak

1

 P.14-3

Engine overheating

2

 P.14-4

Radiator fan and condenser fan do not operate

3

 P.14-6

SYMPTOM PROCEDURES

Inspection Procedure 1: Coolant Leak

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DIAGNOSIS

STEP 1. Check for coolant leaks.

When pressure testing the cooling system, slowly release
cooling  system  pressure  to  avoid  getting  burned  by  hot
coolant.

ENGINE COOLING

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SEALANT

｠

Be sure to completely clean away any moisture from the
places checked.

｠

When  the  tester  is  removed,  be  careful  not  to  spill  any
coolant.

｠

When  installing  and  removing  the  tester  and  when
testing,  be  careful  not  to  deform  the  filler  neck  of  the
radiator.

ZC602733

Cap adapter

Adapter

AA00

Check  that  the  coolant  level  is  up  to  the  filler  neck.  Install  a
radiator tester and apply 160 kPa (23 psi) pressure, and then
check for leakage from the radiator hose or connections.

Q:Is  leakage  present  from  the  radiator  hose  or

connections?

YES:

 Repair or replace the appropriate part, then go to

Step 2.

NO:

 There is no action to be taken.

STEP 2. Retest the system.

Q:It there still coolant leakage?

YES:

 Return to Step 1.

NO:

 The procedure is complete.

Inspection Procedure 2: Engine Overheating

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DIAGNOSIS

STEP 1. Remove the radiator cap and check for coolant
contamination.

Q:Is the coolant contaminated with rust and oil?

YES:

 Replace it. Refer to P.14-15.

NO:

 There is no action to be taken. Go to Step 2.

STEP 2. Check the radiator cap valve opening pressure.

NOTE: 

Be sure that the cap is clean before testing. Rust

or other foreign material on the cap seal will cause an
improper reading.

ZC602734

Cap adapter

AA00

(1)

Use a cap adapter to attach the cap to the tester.

(2)

Increase the pressure until the gauge indicator stops moving.

Minimum limit: 83 kPa (12 psi)
Standard value: 93 - 123 kPa (14 - 18 psi)

Q:Does the reading remain at or above the minimum limit?

YES:

 Go to Step 3.

NO:

 Replace the radiator cap. Then go to Step 5.

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ENGINE COOLING

ENGINE COOLING DIAGNOSIS

STEP 3. Check thermostat operation.
Refer to P.14-21.

Q:Does the thermostat operate correctly?

YES:

 Go to Step 4.

NO:

 Replace the thermostat, then go to Step 5.

STEP 4. Check the drive belt for slippage or damage.
Refer to GROUP 00, Maintenance Service - Drive Belt (For The
Generator,  Water  Pump  and  Power  Steering  Pump)  (Check
Condition) P.00-58.

Q:Is the drive belt loose or damaged?

YES:

 Adjust or replace the drive belt, then go to Step

5.

NO:

 There is no action to be taken.

STEP 5. Retest the system.
Check the engine coolant temperature.

Q:Is the engine coolant temperature abnormally high?

YES:

 Return to Step 2.

NO:

 The procedure is complete.

ENGINE COOLING

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ENGINE COOLING DIAGNOSIS

Inspection Procedure 3: Radiator Fan and Condenser Fan do not Operate

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FUSIBLE
LINK

29

FUSIBLE
LINK

28

RADIATOR 
FAN 
RELAY

FAN 
CONTROL
RELAY

CONDENSER
FAN RELAY

RADIATOR 
FAN 
MOTOR

CONDENSER 
FAN 
MOTOR

ETACS-
ECU

BLUE − WHITE

BLUE − WHITE

BLUE − WHITE

BLUE

BLUE

YELLO

W − BLUE

BLA

CK

BLA

CK

YELLO

W − VIOLET

YELLO

W − PINK

BLUE

RED −

BLA

CK

RED

RED

Radiator Fan and Condenser Fan Drive Circuit

D7G14M000A00

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ENGINE COOLING

ENGINE COOLING DIAGNOSIS