I pulled the casing off the core on my 52'. This isn't the heater mounted to the side vent, but comes straight out of the fire wall. It has a diverted knob for heat/defrost. It has a 3-speed fan swithch located at dash bottom just to the left of the steering column. But how do you control the temp? Also, is there a manual/guide that shows clearly anything and everything ever mounted on, in, around and under the dash on the Advanced Design?
Oh, and while I'm at it, what does the original horn look like on a 52' and was it located on the intake manifold in front of the carb?