Models produced before January 1985
Removal
1. Disconnect the negative battery terminal.
2. Remove the wiper arm as described previously.
3. Pry the cover from above onto the wiper arm pivot axis.
4. Remove the two fasteners, one on each side at the front, securing the air inlet cover above the air intake box.
5. Remove the rubber seal to release the front of the cover.
6. Remove the rear seal on both sides, then remove the two screws, one on each side, securing the cover to the engine compartment bulkhead.
7. Remove the air intake cover from the air intake box.
8. Remove the three rear bolts and one front bolt securing the electric motor and linkage to the engine compartment bulkhead.
9. Remove the cover over the central mounting block (fuses) and unscrew the two mounting nuts and two screws.
10. Remove the main assembly block upward and forward, then disconnect the wiper motor wire connector from the base of the block.
11. Remove the electric motor and lever mechanism by manipulation.
Installation
12. Installation is carried out in reverse order.
Models produced after January 1985
Removal
13. Remove the panoramic wiper arm as described in the previous paragraph.
14. Remove the two screws and fasteners, one on each side at the front, securing the air intake grille on top of the air intake chamber (see fig. 18.14).
Fig. 18.14. Unscrew the front screws of the air intake cover
15. Remove the rubber seal from the front of the cover (see fig. 18.15).
Fig. 18.15. Lift the rubber seal
16. Remove the rear seal on both sides, then remove the two screws, one on each side, securing the air intake cover to the engine compartment bulkhead (see fig. 18.16).
Fig. 18.16. Remove the rear seal and unscrew the screw (shown by arrow) on both sides
17. Remove the air intake cover from the air intake box (see fig. 18.17).
Fig. 18.17. Remove the air intake cover
18. Loosen the bolt and pull the front support bracket off the linkage stud (see fig. 18.18, a, b).
Fig. 18.18, a. Unscrew the bolt (shown by arrow)...
Fig. 18.18, b....and remove the support bracket
19. Loosen the bolts securing the lever mechanism to the engine compartment bulkhead and remove it forward into the air intake box (see fig. 18.19).
Fig. 18.19. Pull the lever mechanism into the air intake box
20. Disconnect the electric motor wiring harness and remove the unit from the vehicle (see Fig. 18.20, a, b).
Fig. 18.20, a. Disconnect the electric motor connector...
Fig. 18.20, b....and remove the electric motor and lever mechanism
Installation
21. Installation is carried out in reverse order.
(Article borrowed from the web portal: «MercedesMan.ru»)