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TM-9-2320-280-10 HMMWV Operator Manual Download

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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. 3-30