Pressure Test

Pressure Test
1. Switch the engine off.
2. Open the hood and install protective fender covers.
3. Install the adapter fitting from the Pressure Tester tightly, between the overflow/air purge nipple and the overflow/air purge hose at the coolant expansion tank. Reinstall the coolant expansion tank cap.
4. Attach the pressure pump and gauge to the adapter fitting and pressurize the cooling system to the coolant expansion tank cap lower limit.
5. Pressurize the cooling system. 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, coolant 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 system pressure by loosening the coolant expansion tank cap. Check the coolant level. Replenish as necessary with the correct coolant solution.
7. Conduct the coolant expansion tank cap Pressure Test.
8. Release pressure by turning the pressure relief screw counterclockwise. Then, tighten the pressure relief screw and repeat Step 5 at least twice to make sure the pressure test reading is repeatable and within acceptable gauge reading limits of the coolant expansion tank cap.
9. If the pressure test gauge readings are not within acceptable gauge reading limits, install a new coolant expansion tank cap.