I get warm air coming through the car when I'm moving at speed, but any speed setting on the dashboard doesn't trigger the fan to work.
When I change the dial on the dash between speed 4 and 5 I can hear the clicking of a relay at the bottom of the windscreen somewhere. However, the fan doesn't work at any speed.
I've located the fan at the bottom of the windscreen under the scuttle panel (see pic):

There seems to be very little information online regarding this fault. I've found a small bit of information about the fault either lying with the fan itself or a resistor near by along the power cables. However, I can't follow the red and black cables connected to the fan because they disappear under the air-conditioning units. And I can't see any way to get the fan out of this tiny area.
There is a flap in the bulkhead which I've managed to get my hand into which I think opens up in this area. However, I think the fan must have to come out towards the front of the car, so I can't see how this fan would help.
Can anyone help advise me on how I get this fan out of this area?
Or where I might locate the resistor which may be defective?
Or failing that, can someone advise me on how to take the passenger side of the dashboard apart to perhaps expose this area (I don't mind driving around with the dashboard in bits, but I still need the car to be driveable while I diagnose the fault)
Thanks,
Rob