The rear aircon consisted of a blower/evaporator unit that fits in the rear wing where the left hand occasional seat would be if you had a 7-seater, it further has extended coolant pipes from the A/C system in the front, a different headling with 5 outlet vents, ducting that leads up the D-pillar from the A/C unit to these vents, a control unit in the headlining near the sunroof control and a loom for all the interconnections.
It is a pig to retro-fit though not impossible as all the holes in the floor and mounting points etc are on all vehicles, but you would need to very determined and pretty good with the spanners to try it. units or even complete kits do occasionally come up on ebay, in fact I have a spare blower/evaporator unit if anyone needs one.
The system was normally only fitted to 5-seaters, but it is technically possible to fit it to 7-seaters, though the left seat then gets pushed so far out into the bot space, that I think it is more trouble than it's worth
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