I have 1988 240dl. Car had been sitting for 2 years without moving. I was basically given it. Problem i have is that the slow wiper doesnt work and the washer pump front and rear not working either. I get
I don't know about the rear pump.
On the front pump, it's probably fluid sludge in the pump, or oxidation on the electric terminals.
On my '84, it's easy to remove the washer pump from the fluid reservoir, dismantle, clean the dried mineral deposits from the fluid conduits and the electric conductors. Also, run a stiff wire or coat hanger through the tubing leading to the windshield spray nozzles. Re-assemble in reverse steps.
If you have voltage at the pump but it won't run, the pump is bad. If you take it apart you'll probably find the gears are clogged with dirt and debris, the nozzles are probably plugged up too, they can usually be cleaned out with compressed air.
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