Component Tests and General Diagnostics

1. Remove the radiator cap.

WARNING: NEVER REMOVE THE RADIATOR CAP WHILE THE ENGINE IS RUNNING. THIS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM, THE ENGINE, AND/OR PERSONAL INJURY. USE EXTREME CARE WHEN REMOVING THE RADIATOR CAP FROM A HOT SYSTEM TO AVOID A BLOWOUT OF SCALDING HOT COOLANT OR STEAM. IF POSSIBLE, WAIT FOR THE ENGINE TO COOL, THEN WRAP A THICK CLOTH AROUND THE RADIATOR CAP AND TURN IT SLOWLY TO THE FIRST STOP TO RELEASE SYSTEM PRESSURE. WHEN PRESSURE IS RELEASED, PRESS THE RADIATOR CAP DOWN (STILL USING THE CLOTH) AND TURN IT THE REST OF THE WAY FOR REMOVAL.

2. Install Rotunda Cooling System Adapter 014-R1071 or equivalent onto the filler neck adapter.
3. Use tap water to clean the radiator cap's rubber seal and vacuum relief valve.
4. Install the radiator cap onto the radiator cap pressure test adapter.
5. Connect the female quick disconnect fitting of Rotunda Radiator/Heater Core Pressure Tester 014-R1072 or equivalent, to the male quick disconnect fitting of the filler neck adapter.
6. Slowly depress the plunger of the tester until the pressure gauge reaches 93-123 kPa (13.5-17.8 psi).

NOTE: If the plunger of the tester is depressed too fast, a false pressure reading will result.

7. Verify the radiator cap maintains pressure.
8. Release the pressure by depressing the relief valve on the underside of the tester.
9. Repeat the test at least twice to verify that the pressure reading is acceptable and consistent. If the radiator cap pressure is less than the specified value, replace the radiator cap.