TM 9-2320-386-10 Change 1 2-79 2-31. OPERATION UNDER UNUSUAL CONDITIONS INDEX 2-32. Operation in Extreme Cold 2-79 2-33. Operation in Ice or Snow 2-82 2-34. Operation in Extreme Heat 2-84 2-35. Operation in Dusty or Sandy Areas 2-87 2-36. Operation in Rainy or Humid Conditions 2-88 2-37. Operation in Deep Mud 2-89 2-38. Fording Operation 2-90 TITLE PAGE NO. PARA. NO. 2-32. OPERATION IN EXTREME COLD a. General. The operator must always be alert to changes in weather. The operator must take care of assigned vehicle in order to prevent damage to vehicle because of sudden changes in weather. The operator should be cautious when start- ing or driving a vehicle that has not been operated for a long period. Lubricants may thicken and cause parts failure. Tires may freeze to the ground or may freeze flat on the bottom if underinflated. The operator should be alert to such possibilities to prevent extensive damage to the vehicle. b. Before Operation. (1) Turn OFF CTIS (para. 2-19). (1.1) Perform “before operation” PMCS (table 2-2). (2) Start power plant heater, if equipped, to warm engine coolant, engine, and batteries before attempting to start engine (para. 2-43). (3) Deleted (4) Deleted c. Starting Engine. CAUTION Do not operate power plant heater with engine running. Doing this may result in overheated engine.