Hi Massi, firstly l have to say that Morgan were in the habit of changing all sorts of parts one year to the next so this info from a 93 +4 may not apply exactly.
The heater on a 93 is a PVH, no longer in business unfortunately, it is the one illustrated in the Morgan parts book and is a narrow rectangular box with a two speed fan. It has a cable controlled water valve operated from under the steering column and a manual flow diverter knob in the passenger (rhd) footwell. Works well in an old fashioned way, not needed after driving some while as the heat from the engine takes over but useful for demisting windscreen in a short door car.
