I have noticed a few times since I bought the S Type that a fan would be running after the car was turned off for 10 to 15 minutes. I heard it in the garage and guessed it was the cooling fan behind the radiator. It happened again today and it is the cabin fan running at a high speed. Is this normal?

 

Sort of. It's to try to reduce condensation but not many have it happen so I suppose an alternative is that a sensor is bad and tricking it. If all seems OK, I'd ignore it.