Vendo 39 schematics

[doug smith]

I have the early 39 with only the evaporator fan, someone replaced the fan motor and never rewired it.  From the relay box, which is seperate and not mounted on the compressor, a 3 wire lead goes to the evaporator fan, 2 black and one red wires, trying to figure where the red wire connects.  Also, I think the thermostat is located inside the control box, and there is a screw on the back of the housing, does this regulate the temp?  Im sorry, as you can tell that I am an amateur at refrigeration even though I am 62 years old.  Any help would be appreciated, and thanks in advance.