14-ENGINE OVERHEATING

Inspection Procedure 2: Engine Overheating

DIAGNOSIS

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

Is the coolant contaminated with rust and oil?

Replace it. Refer to

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.

Does the reading remain at or above the minimum limit?

Go to Step 3

Replace the radiator cap. Then go to Step 5

STEP 3. Check thermostat operation.

Refer to

Does the thermostat operate correctly?

Go to Step 4

Replace the thermostat, then go to Step 5

STEP 4. Check the drive belt for slippage or damage.

Refer to GROUP 00, Maintenance Service - Drive Belt (For The Generator, Water Pump and Power Steering Pump) (Check Condition)

Is the drive belt loose or damaged?

Adjust or replace the drive belt, then go to Step 5

There is no action to be taken.

STEP 5. Retest the system.

Check the engine coolant temperature.

Is the engine coolant temperature abnormally high?

Return to Step 2

The procedure is complete.