2004 X3 3.0i - Passenger footwell damp

[GregE240]

Hi

Long time lurker and first post - be gentle!

My partner has a late 2004 3.0i petrol X3. Great car, and she loves it to pieces.

However, recently the car has started to mist up like nobodys business, and the carpet under the matt in the passenger front footwell gets damp. If you lift the matt for a few days, it dries out.

I have seen some comments regarding sunroof seals, but our car is not fitted with a sunroof, so any ideas most appreciated. The car is out of warranty, but we have a third party warranty which should cover any remedial work.

Many thanks
Greg