Potential HVAC problems - how to diagnose?
I have two potential problems, neither currently an issue, but "a stitch in time" as they say:
1. The solar sunroof intermittently is just not working. (Today it is)
2. VCDS scan of HVAC, Fault Found: 00716 - Air recirculation Flap Positioning Motor (V113) 41-00 - Blocked or No Voltage. ( This fault returns immediately if cleared)
There is no discernible pattern to the sunroof issue, if it's working, even on a grey day, it's vigorous. It had a new HVAC fan motor last summer. 
But where to start on prodding, poking, measuring and diagnosis? My understanding (from long ago so could be wrong) is that the switchover is done by a relay WITHIN the HVAC, so the external wiring is very simple.
I did once fit a simple override (cutoff) switch in the (earth leg of the) sunroof circuit but MJ reverted that to OEM last summer as it wasn't the best quality job. 
I normally run with the auto-recirculate on and haven't noticed anything odd. The air quality sensor was showing a fault long long (years) ago but I dismantled and cleaned it and it's always been fine. Again, I understand that there are procedures that can exercise/test/reset the HVAC flaps more thoroughly, but is that advisable and how best to do it?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
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".  (A much rarer model than a D2 S8 by the way!) 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. AgateGrey/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, Auto-dim mirror, Leather, 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!
Last edited by HPsauce; 12th June 2023 at 10:58 AM.
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