Coolant System Pressure Test

Engine Cooling

Component Tests

Coolant System Pressure Test

WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

1. Turn the engine OFF.

2. Remove the pressure relief cap. Top off the radiator as needed.






3. Fit the Radiator/Heater Core Pressure Tester from the Pressure Test Kit to the radiator fill neck using the correct adapter.

4. NOTICE: Do not pressurize the cooling system beyond the maximum pressure listed in the specification table or cooling system components may be damaged.

NOTE: If the plunger of the Pressure Test Kit is depressed too fast, an incorrect pressure reading will result.

Pump the cooling system to the maximum allowed pressure and hold for 2 minutes. If the pressure drops within this time, inspect for leaks and repair as necessary.

5. If no leaks are found and the pressure drops, the leak may be internal to the radiator transmission cooler. Inspect the coolant for transmission fluid and the transmission fluid for coolant. Repair as necessary.

6. If there is no contamination of the coolant or transmission fluid, the leak may be internal to the engine. Inspect the coolant for engine oil and the engine oil for coolant. Refer to Engine to diagnose the engine.