Maybe, just maybe, you have a Jeep heater that someone put in GM WWII military truck because the Jeep heater was readily available, and in order to save money and keep warm?
There might be no way to either prove or disprove that possibilty.
If the GM Heritage Center had anything, they would be forthcoming. I have spoken with their representatives at shows and over the phone. They like their jobs and they like helping reasonable people. I doubt if they told you to "buggar off", even if they had been "beaten up" by you.
Good luck in finding whatever you are looking for.
In your first post, you state that the heater was civilian in origin, a "dealer option". Presumably, you are referring to a domestic-dealer option/accessory. Do you have a photo/illustation of it in a dated GM sales brochure? If so, would you please post it?
"Trying to date a Harrison heater (the triangular type) that was a dealer option and used during the war (GM still disavows any knowledge of 1942-1945 ever happening)." That statement about GM is specious (look it up).
