The replacement heater fan units come with three wires plus an earth. They are pretty expensive for what they are from the usual Pantera dealers. I am sure they are just a standard unit that could be sourced elsewhere, but I have looked and nothing jumps out.
The originals only have two wires . So it looks like there is a third speed available on the replacement units . Any experience on how best to wire these up considering the original wiring ? Is it possible to use the third speed? or just choose one and have two?