Progress at last! I thought I'd learned my lesson before. 
I managed to manipulate a length of thin plastic tubing roughly into the area marked in red on the attached diagram, i.e. under the cabin air intake and close to the holes in the tray that lead out to the forked outlet duct (26 on diagram) and one-way rubber exit valves.
Kept topping up with hot water and detergent, blowing to agitate then syphoning mucky water and debris out. Then I added a dishwasher tablet dissolved in a small jug of boiling water and soon after - whoosh it cleared. 
Can't tell where the block was or whether only one side of the duct is now free, but I'll keep flushing it out even more regularly now. And throwing in the odd dishwasher tablet too.
From the way the natural drip rate through the drains reduced as the water level dropped to just above the bottom of the tray, my suspicion is that debris was building up around and over those twin holes at the bottom of the scuttle tray, so hopefully it's all cleaned out now. If the blockage had been at the rubber valves it would have drained much lower overnight.
Also I've cable-tied the tube roughly in place and coiled the free end up on top of the ECU box (out of the way of the pollen filter) for future emergency use as a syphon. 
And if those holes are the main obstruction point an occasional brief squirt in from the side with a jet wash might help keep them clear.
__________________
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; 21st May 2017 at 11:48 AM.
|