Thermal Vacuum Valve: Testing and Inspection

THERMO VALVE
1. Disconnect the vacuum hoses from the thermo valve and connect a manual vacuum pump to the thermo valve.
2. Apply a vacuum and verify that when engine coolant temperature is less than 50 degrees C or 122 degrees F that the thermo valve leaks.
3. Allow the engine to warm up until the coolant temperature exceeds 80 degrees C or 176 degrees F and verify that the thermo valve will hold a vacuum.

NOTE: If the thermo valve fails and must be replaced use 3M locking sealant 4171 or equivalent and torque the thermo valve to 20 to 40 Nm (15-30 ft lb). Do not use wrenches or pliers on the resin part of the valve during installation.