These do fail on the Audis & there is a kit available from Audi that replaces both fans as a repair kit.
If the kit doesn't cure it Peter,(which I'm sure it will!) the fans run off a duty cycle on the small green wire from the PCM.
Water ingress into the fuse box (E-Box) in front of the battery can also cause this fan running battery drain fault.
The fans can be run via an output test in the PCM to confirm the signal to the fan controller is correct.
If your fans don't run at all after fitting, check the fuse - 10A in the ebox, this feeds the control circuit. Knackered fan packs can run with this fuse blown.
Jon.
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