Welcome to Mercedesshop and congrats on the car.
Is water getting to the nozzles but not comming out? If so then you may want to take a niddle and clean out the nozzles becuase they get cloged quite often. If that does not work then it could be the motor and there are 2, look at the motors and see if there is a leak there (the motors are on the outside of the resovior). You may need a new motor or you may just need to put a hose back on.
Subman
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