The BMW Z3 Coupe has a problematic rear wiper washer… it dribbles. Apparently a low pressure area forms at the back of the hatch when the car is underway, cause any fluid in the line to be drawn out. It doesn’t pour out, but will leave watermarks and washer residue. BMW acknowledged the problem and issued a simple fix: a check valve inline with the feed to the pump. The parts are cheap, just two hose clamps and a check valve. Simple install as well, though it helps that I already had the hatch interior gutted. See the instructions to the right and the photos below.
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