See Plate 3733. Try all other valves for trapped water in pipe lines. Flushing the Cooling System Complete instructions for flushing the cooling systems are outlined in Maintenance Instruction 1706. Freezing Weather Precautions Do not use any kind of anti-freeze solution in the cooling system. If locomotive is to be left standing where there is danger of freezing, steam may be supplied,to the cooling system, or the system can be drained.
Check valves prevent the water from draining into the steam line.
Steam can be supplied by connecting an outside steam line to the train steam line connection at the end of the locomotive, or by operating the steam generator, on locomotives so equipped. If a single unit is being heated, the steam line can be connected to the jumper at the end of the unit. The train steam line valve should be opened. When disconnecting units from steam feed, see that steam valves are closed to prevent loss of water through check valves. At each end of the engine is a 90 deg bevel gear drive and clutch which operates a pair of cooling fans.