TM 9-2320-386-10 Change 1 2-81 2-32. OPERATION IN EXTREME COLD (Contd) d. Driving Vehicle. CAUTION Do not exceed 5 mph (8 km/h) when operating vehicle with trans- fer case in LOW and transmission in “1” (first). Failure to do this will result in damage to internal engine components. NOTE During operation in extreme cold 0° to -65°F (-18° to -54°C), CTIS must be turned OFF. (1) Place transmission gearshift lever (6) in “1” (first) position and transfer case shift lever (7) in LOW position. Drive vehicle slowly for 100 yds (91 m) to warm up gearcases and tires. (2) If vehicle is to be operated on ice or snow, perform steps in para. 2-33b. e. Stopping or Parking. CAUTION • Operator must take every precaution to prevent snow from blow- ing into engine compartment when parked. Snow may melt and later form ice to jam engine controls. • Ensure engine has achieved and maintained an operating temper- ature of 160°F (71°C) for at least 15 minutes before engine shut- down. Failure to do so may result in engine damage. NOTE Do not idle engine for more than 15 minutes. (1) Park in sheltered area out of wind if possible. Park so vehicle does not face into the wind if sheltered area is not available. (2) Park vehicle with wood planks, brush, mats, or canvas under wheels if a long shutdown period in open area is anticipated. 6 7