How-To Tuesday: 203/209 Windshield Washer Pump Replacement
If you have a windshield washer pump that’s gone out on your W203 or C209, fear not. This may be the easiest and least-expensive repair you will ever have to perform on your ride.
The example you see here is a 2005 C320, and the pump gave up after about 80,000 miles. The pump itself is located behind the front panel of the left side front wheel-well. This is easiest to access with the wheel off. You’ll need a 10 mm socket for some of the fittings, and an appropriate tool to remove push-in clips. Once that’s removed, the pump is literally impossible to miss.
You don’t need any tools to remove the pump itself. I removed the side hose from the pump first to drain excess fluid. Once that has all drained out, you simply lift the pump up and slightly away from the lower grommet that it fits into. Use a flat head screwdriver to remove the electrical fitting.
Most kits that you’ll get from Mercedes-Benz will have a new grommet, which should be replaced. The area around the gromet should be cleaned of any debris that might prevent a water-tight seal. After that, you install it in the reverse way that you removed it.
NOTE: Don’t be alarmed if the pump doesn’t work right away. I found that while the car was up on a jack stand, there’s a system that prevents the pump and the wipers from activating. Once the wheel was put back on and the car was lowered off a jack stand, all worked as it should.
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