WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of with local environmental regulations.

• Drain the cooling system. Refer to Procedure 008-018 in Section 8.
• If coolant dam pressure tester, Part Number AFT-2000, is used to draw a vacuum on the cooling system, it is not necessary to drain the cooling system.

Remove the retaining capscrew and washer.

Remove the coolant filter valve and the o-ring.

Clean the filter head and the coolant filter valve with a fiber brush and solvent.

Inspect the filter head and the coolant filter valve for cracks, pitting, corrosion, or other damage. Replace if damage is found.

Install a new o-ring onto the coolant filter valve.

Lubricate the o-ring and valve with anti-seize lubricant, Part Number 3824397, and install the coolant filter valve into the filter head.

Install the retaining capscrew and washer.

Turn the valve to the "ON" position.

The valve is in the "ON" position when the valve is in the vertical position.

• Fill the engine with heavy duty coolant. Refer to Procedure 008-018 in Section 8.
• Operate the engine and check for leaks.