1-20. WINTERIZATION SYSTEM.
a. When operated, the winterization system heater provides heating of the engine coolant. This coolant is
distributed through the winterization system by the APU driven circulation pump, (see fig. 1-42). Individual components
of the winterization system may be isolated by main engine-mounted valves Normally all valves on the engine should be
Figure 1-42. Winterization System Coolant Flow