LOCATION AND DESCRIPTION OF MAJOR COMPONENTS AND SYSTEMS (CONTINUED)
ENGINE COOLING SYSTEM
Cooling air is drawn through fan well cover and forced through
radiator into engine compartment by two cooling fans. Air flows
around engine and is exhausted through grilles on top of vehicle
engine deck.
Engine coolant flows from coolant pump into two-section
(engine/transmission) oil cooler mounted on engine. From oil
cooler cores, coolant flow is directed into engine water jackets
for engine block cooling. At normal operating temperatures the
bypass thermostat is closed and inlet thermostat is open, allow-
ing coolant to circulate through the radiator. Below normal
operating temperatures, the inlet thermostat closes and the by-
pass thermostat opens allowing coolant to flow through cross-over
tube, bypassing the radiator.
The surge tank collects and stores excess system coolant, allowing
coolant to flow back into the system as required to maintain the
system at full level. Air trapped in the system is bled to atmosphere
through the pressure relief valve which is connected by hose to the
surge tank.
The aeration detector senses low coolant level and activates a warn-
ing indicator light on the operator’s instrument panel.
TA309929
1-13
TM 9-2350-267-20
