There are quite a few posts on the board about doing this.
Most get discouraged when they find out it is $2000 + for OE parts.
The wiring is there in the E53, between the centre switch console and the seats. That makes it a little easier. You need a new centre switch console (SZM) and you need the heated seats.
The heater elements are not liquid, they are a pad that is sewn into the seat cover. Installing OE means buying new seat covers with the elements in them and having an upholstery shop install them, or do it yourself. You could also buy seats from a wrecked X5, or have an upholstery shop put aftermarket heating pads in your own seats, then connect to the BMW wiring.
Look at realoem for the retrofit kit, it also shows the heating elements.
RealOEM.com * BMW E53 X5 3.0i Front seat heating retrofit
RealOEM.com * BMW E53 X5 3.0i Base seat upholstery parts, front
Search on 'heated seats retrofit' here in this forum. It was a much more popular topic in the early days of the E53.
Some threads to get you started:
http://www.xoutpost.com/bmw-sav-foru...seat-swap.html
http://www.xoutpost.com/bmw-sav-foru...yone-done.html
http://www.xoutpost.com/bmw-sav-foru...-retrofit.html
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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