Cooling System Pressure Test

Engine Cooling

Component Tests


Cooling 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.

NOTE: Vehicles have the pressure relief cap on the radiator.

1. Turn the engine OFF.

2. Remove the pressure relief cap. Top off the radiator as needed. Fit the Pressure Test Kit to the radiator fill neck.

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

NOTE: If the plunger of the pressure tester is pressed too fast, an erroneous pressure reading will result.

Slowly press the plunger of the pressure test pump until the cooling system is pressurized to the maximum allowed pressure and hold for 2 minutes. If the pressure drops within this time, inspect for leaks and repair as necessary.

4. If no leaks are found and the pressure drops, the leak may be internal to the engine. Inspect the coolant for engine oil and the engine oil for coolant. Refer to Engine System - General Information Testing and Inspection to diagnose the engine.