TM   10-3930-643-20 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 4-6. Cooling   System   Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION a.  OIL  IN  COOLING  SYSTEM. Send   vehicle   to   Direct   Support. b . OVERHEATING. Step   1. Check   for   any   restrictions of   air   flow.   Inspect   fan   blades,   fan shrouds   and   radiator   fins. Check   belts   for   correct   tension   and wear.   Refer   to   paragraph   4-33. If   parts   are   damaged   or   missing,   repair   or   replace   as   necessary. If   no   restriction   is   found,   go   on   to   step   2. 4-18

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