Change the coolant filter at every oil and filter change interval.

The correct coolant filter to be used is determined by the total cooling system capacity and the oil drain interval.

Refer to Coolant Recommendations and Specifications in Section V for the correct filter selection and test procedures.

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.

CAUTION  Mechanical over-tightening can distort the threads or damage the filter head.

Apply a light film of lubricating oil to the coolant filter gasket sealing surface before installing the coolant filter.

Install the filter as specified by the manufacturer.

CAUTION  Severe engine damage will result if the shutoff valve is left closed.

After the filter has been changed, open the shutoff valve and install the radiator pressure cap.

Operate the engine until the coolant temperature is above 82°C [180°F], and check for coolant leaks.

After the air has been purged from the system and a minimum of 30 minutes of operation, check the coolant level and top off as needed with premixed coolant.