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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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