TM-9-2320-280-10

TRUCK, UTILITY: M998 SERIES

OPERATOR’S MANUAL

JANUARY 1996

TM-9-2320-280-10 - Page 310 of 405

TM 9-2320-280-10

3-23.

EMERGENCY FAN CLUTCH OVERRIDE

a.

The radiator fan in M998 series vehicles normally activates when engine temperature exceeds 220 °F

(104 °C) and deactivates when engine temperature drops to 190 °F (88 °C).

If overheating occurs in an

emergency situation, this procedure will ensure continuous fan operation.

b.

Raise and secure hood (para. 3-8).

NOTE

Stop engine (para. 2-12) prior to disconnecting time delay module.

c.

Disconnect time delay module connector (1) from control valve connector (2).

d.

Start engine (para. 2-10).

e.

Check fan for continuous operation.

If fan is not operating continuously, stop engine and notify unit

maintenance.

f.

Lower and secure hood (para. 3-10).

g.

Allow engine to cool at idle until engine temperature lowers to normal operating temperature of 190 °-

230 °F (88 °-110 °C).

h.

Proceed to unit maintenance with vehicle.

Make certain unit maintenance is notified of emergency

service performed on vehicle.

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