Inspection Procedure 2
INSPECTION PROCEDURE 2: Engine OverheatingDIAGNOSIS
STEP 1. Remove the radiator cap and check for coolant contamination.
Q: Is the coolant contaminated with rust and oil?
YES: Replace it.
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.
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.
STEP 3. Check thermostat operation.
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.
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.