MAINTENANCE coolant until the radiator is full. 17. Drain and clean the inside of the radiator overflow tank (1). Then add coolant up to the FULL mark. 18. Install the radiator cap as outlined in this section. REMARKS: Always replace the coolant corrosion resistor filter after cleaning and flushing the cooling system and installing new coolant. See “24.7 EVERY 500 HOURS SERVICE” on page 3-54. 3-68 WA320-3MC