Inspection Procedure 2: Engine Overheating: Diagnosis

WARNING: This page is about a different variant/trim than selected.

STEP 1. Remove the radiator cap and check for coolant contamination.
Q: Is the coolant contaminated with rust and oil?
1. YES: Replace the coolant (Refer to ENGINE COOLANT LEAK CHECK ). Then go to Step 5.
2. NO: 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.
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?
  1. YES: Go to Step 3.
  2. NO: Replace the radiator cap. Then go to Step 5.
    
    Fig 1: Attaching Cap To Tester
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 3. Check thermostat operation.
Refer to THERMOSTAT CHECK .

Q: Does the thermostat operate correctly?
1. YES: Go to Step 4.
2. NO: Replace the thermostat (Refer to REMOVAL AND INSTALLATION ). Then go to Step 5.
STEP 4. Check the drive belt for slippage or damage.
Refer to DRIVE BELTS (CHECK CONDITION) .

Q: Is the drive belt loose or damaged?
1. YES: Adjust or replace the drive belt. Then go to Step 5.
2. 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?
1. YES: Return to Step 2.
2. NO: The procedure is complete.