A manual shutoff valve is provided to prevent coolant leakage while changing the coolant filter.

With the valve in the vertical position, the coolant flows to and from the coolant filter. In the horizontal position, the coolant flow is stopped to and from the coolant filter.

WARNING  Do not remove the radiator cap from a hot engine. Hot steam will cause serious personal injury. Remove the coolant system pressure cap, and close the coolant filter head shutoff valve before removing the coolant filter. Failure to do so can cause personal injury from heated coolant spray.

Remove the radiator pressure cap.

Turn the coolant shutoff valve to the OFF position.

Remove and discard the coolant filter. Clean the gasket surface on the filter head.