Component Tests and General Diagnostics

NOTE: If no problem is found with the vehicle inspection and the radiator cap testing, and there is a coolant loss, the cooling system pressure test should be performed.

1. Make sure the engine (6007) is cool before performing the test.
2. Connect Rotunda Radiator/Heater Core Pressure Tester 021-00012, or equivalent, to the filler neck adapter using the quick disconnect fitting.
3. Connect the filler neck adapter to the Cooling System Adapter 021-00053.





4. Connect the adapter to the radiator filler neck.

CAUTION: Do not pressurize the system above the given specification, a higher pressure may cause damage to the cooling system.

5. Pressurize the system to 157 kPa (23 psi).
6. Observe the pressure gauge for approximately two minutes.
7. Release the system pressure by depressing the relief valve on the underside of the tester.
8. If the system does not hold pressure, check for leaks at all external cooling system connections including the heater core and hoses. If no leaks are present, check for a possible internal engine leak.