Very common on this car for w/s wiper linkage system to "tighten" up. If you continue to use it in this condition, it can burn-up motor, burn out switch & relay. Have seen this more than once incl MY race car before I bought it. On "C"-class have replaced too many!! Lots of $$$$$$

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V