DRAIN/FILL COOLING SYSTEM (M548A3) -- Continued
Coolant must flow freely to help prevent overheating and engine damage. If rust, scale, or
sediment prevent free flow of coolant, flush system per TB 750-651. This will be done only when
Coolant in the radiator, cylinder block, cylinder heads, oil cooler, coolant tubes, and hoses must
flow freely. When rust, scale, or other sediment keeps the coolant from flowing freely, flush per
TB 750-651. The procedure will be performed only as necessary and not as a routine
System coolant capacity is 14 gallons (53 liters). Use antifreeze in system at all times to reduce
corrosion in engine block and cooling system. Coolant provides high and low temperature
Coolant means the mixture of water and antifreeze.
Remove coolant filler cap (1). Add antifreeze and clean water mix based on protection chart label (on container).
During initial fill add coolant slowly, especially the last few quarts (liters), to permit trapped air
Fill system slowly with 14 gallons (53 liters) of coolant. Bring coolant level to within 1/2 inch (13 mm) of bottom of
filler neck (2).
Use antifreeze and battery tester or radiator test kit to check coolant for level of protection required for climate.
Install coolant filler cap (1) on filler neck (2).