Just bought a fresh air heater from a fellow bolter for my 49 sub. Looked in the shop manual but can't find anything on the fresh air heater. Also did a search. I need to know if there is a water control valve in this system and if so where to put it. Also It has a 6 volt motor and I have converted to a 12 volt system. I see that most of the vendors sell 12V replacement motors and I am wondering if they will swap as direct replacements. A couple of questions. Are these motors one speed or does the switch give you more than one speed? Is there a schematic that shows the water valve hookup and the electrical connections. I also need to get the core checked out. Any help out there? Weeds
