The GAA Power Plant--Part 4

Allow me to draw your attention to the image of the radiator being lifted; though not labeled as such it's Figure #60.  Notice that this is the same radiator in the M50/M51 tanks; it is installed upside-down from this view in the IDF versions.  Those three fittings, which may be drain plugs, face down on the IDF tanks.  If they are drain plugs, then the radiator arrangement in the M4A3 is a little odd in that it would require removal of the radiator to drain the coolant...so they may have some other function.  But the orientation is clear; up on the A3 and down on the M50/M51.