OPERATION IN EXTREME COLD
During extremely cold weather, operating procedures may need to be extended to ensure
proper machine warmup. Failure to follow this caution may result in damage to equipment.
Refer to FM 9-207, Operation and Maintenance of Ordnance Materiel in Cold Weather;
FM 31-70, Basic Cold Weather Manual; and FM 31-71, Northern Operations, for
additional information on cold weather operation and maintenance.
DO NOT service cooling system unless engine has cooled. This is a pressurized cooling
system and escaping steam or hot coolant will cause serious burns.
DO NOT remove cooling system radiator cap when engine is hot. Allow engine to cool
down. Loosen cap to first stop and let any pressure out of cooling system, then remove
Wear effective eye, hand, and skin protection when handling coolants.
Failure to follow these warnings may result in death or injury to personnel.
1. Inspect for leaks and general condition.
2. Ensure hose clamps are tight.
3. Cooling system mixture should be 50% ethylene glycol and 50% water at 34°F (1°C) or higher. At tempera-
tures lower than 34°F (1°C), mixture should be 60% ethylene glycol and 40% water.
4. Check coolant level in coolant overflow tank. If necessary, add coolant to correct level (WP 0020).
5. Notify Field Maintenance if system needs service beyond adding coolant.