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Page Title: Section III. LIQUID COOLING SYSTEMS
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TM  9-2320-356-BD Section   III. LIQUID COOLING SYSTEMS 7-6. COOLANT SUBSTITUTE A   liquid-cooled   engine   cannot   operate   for   long   without   coolant.   When   normal coolants   are   not   available,   a   substitute   may   be   used. Any   liquid,   except   gasoline or   jet   fuels,   can   be   used;    but   some   liquids   will   deteriorate   the   cooling   system’s rubber   components. Petroleum   products   will   not   transfer   the   heat   as   efficiently   as water-based   coolant,   but   will   work   if   nothing   else   is   available. Old   engine   oil   or fluids   drained   from   damaged   vehicles,   transmission   oil,   or   hydraulic   fluids   may   be a   possible   source   of   fluids. The   cooling   system   must   be   drained   and   flushed   as soon   as   possible   if   petroleum-based   fluids   are   used. 7-7. THERMOSTAT STUCK The   thermostat   regulates   the   engine   operating   temperature   by   controlling   coolant flow   through   the   engine. When   the   thermostat   is   stuck   in   the   closed   position,   it prevents   coolant   from   circulating   and   causes   engine   overheating.   BDAR   repair   is   to remove   the   thermostat   and   operate   the   vehicle. If   the   thermostat   is   stuck   in   the open   position   or   removed, it   may   degrade   engine   performance   and   increase   fuel consumption. 7-8. ENGINE  COOLANT  FROZEN General   Information: During   cold   weather,    inadequate   antifreeze   protection   will   cause   the   coolant   to freeze. Care   must   be   taken   when   thawing   the   cooling   system   that   damage   is   avoided. The   water   pump   may   be   unable   to   turn,   which   will   damage   drive   belts   as   well   as   the pump   itself. The   thawing   procedure   must   include   frequent   inspections   for   leaks which   will   indicate   cracked   or   broken   components. Engine   temperature   must   also   be monitored   to   prevent   damage   due   to   overheating. Limitations: o   None, if   engine   is   left   running   or   antifreeze   protection   is   upgraded Personnel/Time   Required: o   2   soldiers o   30-60   minutes Other   Options: o   Route   air   from   fuel-operated   vehicle   heater   over   the   radiator. o   Route   another   vehicle’s   exhaust   gases   over   the   radiator. 7-4

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