TM 9-2320-365-102-21. VEHICLE OPERATION (CONT)NOTE• Water Temperature must be a minimum of 100F (38C) in order todrive vehicle. Engine will warm up to normal operating temperature of165F (74C) more quickly if engine is under a load condition such asdriving.• Vehicle performance, including heater/defroster, will be reduced when engineoperating temperature is between 100F to 165F (38C to 74C). Avoidconditions requiring maximum performance until engine reaches 165F (74C).(11) Operate engine at idle (750 rpm) to warm-up engine until WATER TEMP gage (11)reaches a minimum of 100F (38C) to begin driving or normal operatingtemperature of 165F (74C).NOTEPerform step (12) in outside temperatures of 32F to -25F (0C to - 32C),if extreme or unusual conditions exist such as heavy windshield frost or whenit is difficult to achieve normal operating temperature of 165F (74C).(12) Perform Rapid Engine Warm-Up (para 2-59).(13) Check that WATER TEMP gage (11) reads between 100F to 230F (38C to 110C). If WATER TEMP gage reads in the red zone or high engine temperatureindicator (12) is illuminated, shut down engine (para 2-21f) and perform EngineSystem Troubleshooting (para 3-3).2-138 Change 1
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