TM 9-2320-364-102-70 Table 2-1. Operators Preventive Maintenance Checksand Services (Before) - CONT.LocationItemNo.IntervalItem toCheck/ServiceProcedureNot Fully MissionCapable if:NOTEAt idle speed, automatic transmission may not reach normaloperating temperature. Gage may not register until oil is hot.11BeforeControlsandIndicators -Cont.(o) Check transmission oiltemperature gage (23). Normaloperating TRANS TEMP gagereading is between 180 to 220degrees F (82 to 104 degrees C).Gage is inoperableor reads over 300degrees F (149degrees C).NOTEAt idle, engine may not reach 180 degrees F (82 degrees C) watertemperature.(p) Check water temperature gage(24) for proper water temperaturerange between 180 to 230 degreesF (82 to 110 degrees C).(q) Check for proper operation ofelectric horn (25).Water temperaturegage inoperable orexceeds 230 degreesF (110 degrees C) atidle or warning buzzer sounds.(r) Check for proper operation ofair horn (26) (if equipped).(s) Remove wheel chocks.