Ventilated seat conversion kits are available in the German "Original BMW Teile und Zubehör 2003 BMW 5er-Reihe" catalogue from BMW. (Original BMW parts and accesories 2003 BMW 5-series)
On page 24 in the catalogue:
Active seat-ventilation
Eight fans in the seat area and back rest blow up to 80 litres of air per minute through the perforated seatcover: increase of comfort in summer through a pleasantly cool seat-temperature.
On page 8 in the separate price list:
Active seat-ventilation
5-series (E39)
Complete retrofit kit (only in leather Montana black)
- for standard seat 82 30 0 142 329 720.00 Euro
- for standard seat (with padding code F6)
82 30 0 142 328 720.00 Euro
- for sport seat 82 30 0 142 330 800.00 Euro
Retrofit kit, single
(On ordering the seat covers specify colour code)
- retrofit kit without seat cover
(for one seat; only together with new seat cover)
82 30 0 142 076 224.00 Euro
- seat cover standard seat 82 30 0 142 333 700.00 Euro
- seat cover standard seat (with padding code F6)
82 30 0 142 332 700.00 Euro
- seat cover for sport-seat 82 30 0 142 331 800.00 Euro
So if I´m not mistaken, it will cost 1024 Euro per seat + installation. If anyone does this conversion, let us know how it works, please.
David