Engine Cooling: Diagnosis Mitsubishi Galant IX

TROUBLESHOOTING STRATEGY

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 «SYMPTOM CHART»(ref-205457-S12919772952005111900000) .
4. Verify that the malfunction is eliminated.

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1. STEP 1. Check for coolant leaks. WARNING: When pressure testing the cooling system, slowly release cooling system pressure to avoid getting burned by hot coolant. CAUTION: 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. 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.
2. STEP 2. Retest the system. Q: It there still coolant leakage? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 10

1. 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 «ENGINE COOLANT REPLACEMENT»(ref-205457-S03914589562005111900000) . NO: There is no action to be taken. Go to Step 2.
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. Use a cap adapter to attach the cap to the tester. 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 .
3. STEP 3. Check thermostat operation. Refer to «INSTALLATION SERVICE POINTS»(ref-205457-S34021656582005111900000) . Q: Does the thermostat operate correctly? YES: Go to Step 4. NO: Replace the thermostat, then go to Step 5 .
4. STEP 4. Check the drive belt for slippage or damage. Refer to «8. DRIVE BELTS (FOR GENERATOR, POWER STEERING PUMP AND AIR CONDITIONING (CHECK CONDITION)»(ref-215473-S33252286472006011200000) . . 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.
5. 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 COOLANT CONCENTRATION TEST

Refer to RECOMMENDED LUBRICANTS AND LUBRICANT CAPACITIES TABLE .

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1. Remove the radiator fan motor connector.
2. Check to see that the fan motor of the radiator turns when applying battery power between the connector terminals of the radiator fan motor. Also check to see that there is no abnormal sound coming from the radiator fan motor at this time.
3. If the radiator fan motor is defective, replace it.