I have had the Discovery for a few months and now have a problem I cannot solve. It is a 95M, 300 Tdi the fan heater started to go intermittant and then stayed at the same speed what ever setting it was on, it would not stop even with the ignition off. So I have disconnected it at the fan to stop the battery getting flat. I have tried to follow the circuit diagram in the workshop manual, but with no success. I pulled all the fuses in turn in the drivers footwell and under the bonnet, but nothing stopped it running. Can anyone suggest what I should look for and how to fix it.

Many thanks