MJ is right in that an overflowing (maybe just partly-blocked) plenum drain will run into the condenser tray. But that won't cope for long.
The problem is that the condenser drains are much smaller as in theory the condenser tray only ever has completely clean water condensed from the air, no debris, and at a slow flow rate.
Of course, in reality, as the tray isn't sealed some dust etc. finds it's way in so occasionally unblocking of the infamous "orange drains" is recommended.
BUT the plenum is inevitably filthy so any overflow has a high chance of bringing bigger debris that will quickly block the aircon drains. 
The end result in my case is that the plenum overflow is usually polluted with small seeds (birch for me) which apart from blocking the aircon drains also come blowing out of the air vents when they've had a chance to dry out! 
Trimming the tips of the orange drains to improve flow is definitely beneficial. 
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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; 5th March 2020 at 05:37 PM.
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