TM-9-2320-428-10

TRUCK, CARGO, 8X8, M977

TECHNICAL MANUAL; OPERATOR'S MANUAL

JUNE 2009

TM-9-2320-428-10 - Page 136 of 1072

COOLING SYSTEM - Continued

Figure 4.

The hot coolant flows from the engine to top of radiator tank (2) and through radiator core

(3) where a stream of air removes heat.

This stream of air is drawn through the core by an air-activated fan (4).

A water pump (5) draws the coolant from the bottom of the radiator and pushes it through

the engine repeating the cooling process.

Thermostats (6), mounted in each coolant outlet elbow, remain closed until the coolant

approaches a predetermined temperature at which time they open.

NOTE

When the coolant temperature drops below the thermostatic rating, the

thermostats close.

An air vent line (7) between the radiator (2) and the water pump (5) inlet removes air trapped

in the engine when the cooling system is being filled.

END OF WORK PACKAGE

TM 9-2320-428-10

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