TM 1-1500-204-23-10e.DrainandFillRadiator. The engine cooling system is shipped with the proper mixture of coolant solution foroperation at temperatures above 0° F. If operating temperatures are below 0° F, the coolant solution must bedrained and filled. See step (7).(1)Remove four hex washer head bolts (1) and lock washers (2). Discard lock washers.Figure 4-8. Coolant Draining and Filling(2)Open airblock (3).(3)Remove radiator filler cap (4).(4)Place pan (section II, appendix D) under radiator drain cock (5).(5)Open drain cock (5) and wait for all coolant solution to drain out. Contact your local environmental officerfor guidance on how to properly dispose of coolant solution in accordance with local regulations.NOTEA drain cock is also provided on the curbside of the engine block. This drain cock is to beused only to ensure that engine has been totally drained of coolant should the unit be storedwithout proper antifreeze mix during freezing temperatures.(6)Close drain cock (5).4-9
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