Don't know about D3 but D2 has 2 pumps 1 for screen 1 for lights. I had to push some stainless wire down the nozzles to clear the, i think the car was in a hard water area at some point in its life. There was something in them causing low pressure that or there is a mesh sreen in the nozzle and i've pushed it out, either way it's much better than before.
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8.
Bright yellow bus o love.
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