OPERATING IN EXTREME COLD (Contd)
On M939/A1 series vehicles, check fluid level in alcohol evaporator (1) located on left side of engine.
Add alcohol as required.
Start engine coolant heater if required. Refer to paragraph 2-45 for engine coolant heater operating
Perform after-operation services in Preventive Maintenance Checks and Services (PMCS table 2-3).
Drain off any accumulated water in fuel filter/water separator (2). To train water from fuel system:
On M939/A1 series vehicles, open fuel drainvalves (3) and (4) on fuel filter/water separator (2) and
drain water into suitable container. Close drainvalves (3) and (4) when clear fuel is visible.
Do not overtighten plastic valve; damage may result and fuel may leak.
On M939A2 series vehicles, loosen drainvalve (6) on bottom of fuel filter/water separator (5) and
drain water into suitable container. Close drainvalve (6) when clean fuel is visible.
If fuel is not clear before approximately one qt (0.946 L) has drained, notify unit maintenance.
After draining has been completed, prime the fuel system (para. 3-8).