Inspection procedure 2

Inspection Procedure 2: Engine Overheating

DIAGNOSIS

STEP 1. Remove the radiator cap and check for coolant contamination.

Q. Is the coolant contaminated with rust and oil?

YES Replace the coolant (Refer to Service and Repair). Then go to Step 5.
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?

YES Go to Step 3.

NO Replace the radiator cap. Then go to Step 5.

STEP 3. Check thermostat operation.

Refer to Testing and Inspection.

Q. Does the thermostat operate correctly?

YES Go to Step 4.
NO Replace the thermostat (Refer to Service and Repair). Then go to Step 5.
STEP 4. Check the drive belt for slippage or damage.

Drive Belt (For Water Pump and Generator) (Check Condition).

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.