With the fact that you have a Jag, it can be two things. so we will start with the hopefull side. Does it ever turn off, if it does then it's ok, your car as well as many other imports computer systems will run the fan for sometimes up to 30 mins after shutting the car off and sometimes during the night if it is an extremly hot night. it helps keep the engine cooled down. now if it never shuts off until your battery runs dead then it is the relay for the fan has a bad ground so the contact doesn't break and you will just have to replace the relay.
hope this helps
If the fan shuts off when the engine cools down, it's probably normal for your car.
Many cars have this feature. The fan will run for a few minutes at a time until the coolant in the radiator drops below a certain temperature. Most vehicles with this feature will have a warning label on the radiator shroud indicating that the fan may start without warning when the engine or radiator is still hot. The only time you would need to be concerned would be if the fan continues to run without turning itself off, and causing the battery to be drained.
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