Diagnosis
Inspection Procedure 2: Engine overheatingDIAGNOSIS
STEP 1. Check for coolant contamination.
Q: Is the coolant contaminated?
YES: Replace it.
NO: There is no action to be taken, then go to Step 2.
STEP 2. Check symptoms.
Q: Is the radiator clogged?
YES: Return to Step 1.
NO: Go to Step 3.
STEP 3. Check the radiator cap valve opening pressure.
NOTE: Be sure that the cap is clean before testing, since rust or other foreign material on the cap sea/ will cause an improper reading.
1. Use a cap adapter to attach the cap to the tester.
2. Increase the pressure until the gauge indicator stops moving.
Minimum LIMIT: 64 kPa (9.2 psi)
Standard value: 73 - 103 kPa (11 - 15 psi)
Q: Does the reading remain at or above the minimum LIMIT?
YES: Go to Step 4.
NO: Replace the radiator cap. Then go to Step 6.
STEP 4. Check thermostat operation.
Q: Does the thermostat operating correctly?
YES: Go to Step 5.
NO: Replace the thermostat, then go to Step 6.
STEP 5. Check the drive belt for loosening or damage.
Refer to Drive Belts (Check Condition).
Q: Is the drive belt loose or damaged?
YES: Adjust or replace the drive belt, then go to Step 6.
NO: There is no action to be taken.
STEP 6. Check trouble symptoms.
Q: Is the coolant temperature abnormally high?
YES: Return to Step 3.
NO: This diagnosis is complete.