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

14-3

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.

14-4

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

14-5

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

14-6

ENGINE COOLING

ENGINE COOLING DIAGNOSIS