Postby davelowe » Sun May 30, 2010 10:15 pm
It would seem that you either have a blockage, or the motor is running (the sound) but is broken (or you have run out of fluid!).
Best bet is to disconnect the plumbing under the bonnet as near to the pump as you can get. Fill the bottle with water and operate the motor. It works bi-directionally depending on whether it is going to the front or rear windows. See if water emerges. If it does, you have blocked jets or pipes somewhere else: strip off the pipework and investigate. If nothing happens, remove the bumper to gain access to the bottle and motor and investigate further.
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Best advice for Megane owners: sell it before it bankrupts you!