TM 10-3930-659-20 Table 4-1.  Mechanical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION COOLING SYSTEM 10.  ENGINE OVERHEATS. WARNING • Servicing of engine cooling system should only be performed on a cool engine. NEVER  remove  clamps  or  hoses  when  engine  is  hot.    Pressurized  steam,  hot water, or coolant will cause serious burns. •  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. Step 1. Remove radiator fill cap (see paragraph 5-38) and inspect for damaged seal, gasket, or vacuum release valve. Replace radiator fill cap (see paragraph 5-38). Step 2. Check for correct coolant level in radiator (see TM 10-3930-659-10). Add antifreeze to engine cooling system (see paragraph 5-38). Step 3. Inspect engine cooling system for proper protection level and for contaminants (see TM 750-254). Drain, flush, and fill engine cooling system (see paragraph 5-38) Step 4. Inspect engine radiator hoses and clamps for looseness, damage, or signs of leakage. Tighten loose clamps. Replace damaged or leaking hoses (see paragraph 5-29). Step 5. Inspect fan belts for proper tension and condition (see paragraph 5-37). Adjust fan belt tension (see paragraph 5-37). NOTE Fan  belts  should  be  replaced  in  matched  sets  even  if  only  one  belt  is  worn  or damaged. Replace damaged or worn fan belts (see paragraph 5-37). Step 6. Inspect engine radiator for debris or damage. Clean debris from radiator fins. Repair damaged or leaking radiator fins (see TM 750-254). Replace engine radiator (see paragraph 5-28). 4-14