Pressure Test

PRESSURE TEST

1. Switch the engine off.
2. Open the hood and install protective fender covers.

WARNING: Never remove the coolant expansion tank cap under any circumstances while the engine is operating. Failure to follow these instructions may result in damage to the cooling system or engine and may cause personal injury. To avoid having scalding hot water or steam blow out of the cooling system, use extreme care when removing the coolant expansion tank cap from a hot cooling system. Wait until the engine has cooled, then wrap a thick cloth around the coolant expansion tank cap and turn it slowly until the pressure begins to release, step back while the pressure is released from the cooling system. When certain all the pressure has been released (still with a cloth) turn and remove the coolant expansion tank cap. Failure to follow these instructions may result in personal injury.





3. Carefully remove the coolant expansion tank cap from the coolant expansion tank to release pressure in the cooling system. Add coolant to the coolant expansion tank as necessary.
4. Install the cooling system pressure tester to the coolant expansion tank and pressureize the cooling system to the coolant expansion tank cap lower limit.
5. Observe the gauge reading for approximately two minutes. Pressure should not drop during this time.
- If the system holds pressure, proceed to Step 8.
- If the pressure drops, check for leaks at the engine to heater core hoses, engine to radiator hoses, bypass hose, water valve hose (if applicable), thermostat housing gasket, radiator and heater core, etc. Also refer to engine system checks if a leak cannot be located in the cooling system. Correct any leaks found and recheck the system.
6. Release the cooling system pressure by turning the pressure relief screw on the cooling system pressure tester. Remove the cooling system pressure tester from the coolant expansion tank. Check the coolant level. Add coolant to the coolant expansion tank as necessary.
7. Carry out the Cap Component Test in this section.