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Originally Posted by moltuae
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Very useful attachment which I've been studying. Thanks Mark (moltuae). 
As far as I can see the main power wiring for the fan is "relatively" simple, though there are some additional thin wires to control units that are probably signalling/sensing in function.
Basically the Brown/Red Earth side goes to a major earthing point via the Blower Controller. Is that the "hedgehog" unit?
And the Red/Black Power side (up to 12v) comes via the fuse and solar panel relay.
Now, I have noticed the recirculation flaps are sometimes closed and reluctant to open, though haven't yet detected any pattern to this. Does this give any clues?
(I do normally use automatic recirculation to limit external fumes etc. but have now turned that off.)
All normal this morning though, fan ticking over gently in the weak sunlight.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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