TM 10-3930-659-20 5-38. ENGINE COOLING SYSTEM DRAINING, FLUSHING, AND FILLING (Con't). a. DRAINING WARNING DO  NOT  remove  radiator  fill  cap  unless  engine  Is  cold.    This  is  a  pressurized  cooling system and escaping steam, hot water, or coolant will cause serious burns. 1. Open cover (1) and remove radiator fill cap (2) from radiator (3). 2. Open draincock (4) at bottom of radiator (3) and allow antifreeze to drain. 3. Remove plug (9) from engine (8) and allow antifreeze to drain. 4. Remove coolant recovery hose (5) from coolant recovery tank (7) and allow antifreeze to drain. 5. Close draincock (4). 6. Install plug (9) on engine (8). 7. Install coolant recovery hose (5) on coolant recovery tank (7). TA706922 5-110