I modified my CDT to run a single speed fan a few years ago, and noticed that the Rover circuit diagram was incorrect, so drew these diagrams up.
The diesel engines run quite cool so will work fine with a single speed fan in the UK climate, but I wouldn't do this with the petrol engined models, as they need all the cooling they can get.
If you do fit a non standard fan the correct rated fuse must be used to protect the circuit. I fitted a 25 amp fuse that was originally used with the donor fan, but of course this may vary.
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Hope this helps.
Mike