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How do you fix windshield wipers that will not go down when shut off on a C230 Kompressor?
Wiki User
∙ 12y ago
If this is a monowiper system, there are a couple of things that can go wrong.
First off, the pot metal chassis that the wiper system is built on can crack in two (due to metal fatigue from constant flexing) near the wiper motor mounting point. The wipers will still work but the slop introduced into the transmission system will prevent the wiper arm from parking correctly at the bottom of the windshield. Typically with this break, the arm will "park" several inches up from the bottom, often right in the driver's line of vision. Only real fix is to buy a new or used wiper assembly. Not hard to replace but rather time-consuming.
Other possibility (somewhat unlikely) is that the crank on the wiper motor gearbox was misinstalled the last time the unit was disassembled for repair. It is on a tapered shaft with a nut holding it in place. If this crank arm is misplaced, the wiper arm will "park" at a nonstandard location. There is a mark on the pot metal transmission chassis that helps align the crank arm, but you have to be aware of it before it can be of any use. This is the more benign of the possible failure modes since it can be fixed without having to purchase any parts- however, you still have to COMPLETELY tear the assembly down (i.e., remove it from the vehicle) to fix it.
Finally, if the wiper operates erratically (speeding up and slowing down appreciably) the arm pivot mechanism may need grease. If you pop off the big pivot assembly plastic cover, you will see a couple of sliders operating on steel rods. These rods need to be greased (I use general-purpose lithium grease) every few years or so or they will stick and cause the mechanism to bind up, possibly leading to wiper motor failure due to burnout. Unlike everything else relating to the wipers, greasing the sliders is actually easy to do.
Apparently the single-wiper concept was finally recognized by Mercedes as a weak design, since they appear to have returned to the "classic" multiple-arm
setup in their more recent offerings.
Wiki User
∙ 12y ago
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