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Shut down engine and re-check coolant levels. (TM 55-1945-205-10-2)
When operating light tower below freezing, perform following steps.
Do not open the radiator cap or reserve cap while the engine is running or
immediately after engine has stopped. Allow engine to cool first. Do not attempt to
add coolant until after engine has stopped running. Failure to follow these
procedures can result in serious injury to personnel.
Remove radiator cap (1) and reservoir tank cap (2).
Check coolant levels.
Add a mixture of less than 50% antifreeze and distilled water to radiator (4) and reservoir tank (5).
Replace reservoir tank cap (2) and radiator cap (1).
Table 1. Mixture of Antifreeze and Water.