TM 9-2320-365-10
2-21. VEHICLE OPERATION (CONT)
NOTE
• Water Temperature must be a minimum of 100 F (38 C) in order to
drive vehicle. Engine will warm up to normal operating temperature of
165 F (74 C) more quickly if engine is under a load condition such as
driving.
• Vehicle performance, including heater/defroster, will be reduced when engine
operating temperature is between 100F to 165F (38C to 74C). Avoid
conditions requiring maximum performance until engine reaches 165 F (74
C).
(11) Operate engine at idle (750 rpm) to warm-up engine until WATER TEMP gage (11)
reaches a minimum of 100 F (38 C) to begin driving or normal operating
temperature of 165 F (74 C).
NOTE
Perform step (12) in outside temperatures of 32F to -25F (0C to - 32C),
if extreme or unusual conditions exist such as heavy windshield frost or when
it is difficult to achieve normal operating temperature of 165 F (74 C).
(12) Perform Rapid Engine Warm-Up (para 2-59).
(13) Check that WATER TEMP gage (11) reads between 100 F to 230 F (38 C to 110
C). If WATER TEMP gage reads in the red zone or high engine temperature
indicator (12) is illuminated, shut down engine (para 2-21f) and perform Engine
System Troubleshooting (para 3-3).
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