I admit to being fascinated watching them lift and squirt whilst someone else was operating the windscreen washer stalk and it was probably the valve action that led me to think they were electrically operated. Pump seems to operate well so I suspect crud/blockage. Hopefully I won't have to dismantle anything. Cheers again for this invaluable advice.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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