TM 9-2320-364-102-730 2-51. OPERATING TRUCK IN EXTREME COLD ENVIRONMENT 26 DEGREES F TO 50 DEGREES F (32 DEGREES C TO 46 DEGREES C).Do not touch extremely cold metal (below 26 degrees F [32degrees C]). Bare skin may freeze to cold metal and causeinjury to personnel.NOTE·Principles for operating in cold environment apply to extremecold environment. Refer to Para 2-50 for operating in coldenvironment.·Before operating truck in extreme cold environment make surearctic kits are installed and truck has been prepared as describedin FM 9-207.(1)Operate arctic heater (Para 2-28).NOTE·Repeat Steps (2) and (3) sequence up to four times.·If engine fails to start after five tries, refer to troubleshooting(Chapter 3).(2)Press and hold ether start switch (1) for five seconds, release and wait fiveseconds. Perform this sequence three times.