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Wiper Arm and Motor Replacement
 
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Pelican Technical Article:

Wiper Arm and Motor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$150

Talent:

*

Tools:

16mm, 13mm socket, E12 socket, puller, trim removal tool

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Wiper arms or motor

Hot Tip:

Watch the hood when working on the arms

Performance Gain:

Working wipers

Complementary Modification:

Replace wiper blades

While the wiper motor and arms on the Mercedes W204 are not known as a high fail item if yours do go kaput this article will show you how to replace them. This is also handy knowledge to have because you need to remove the wiper arms and motor to replace the heater core hoses.

While there are two wiper blades on the Mercedes W204 there are three arms to work them.
Figure 1

While there are two wiper blades on the Mercedes W204 there are three arms to work them. The driver side wiper uses a single arm (yellow arrow), while the passenger side has two arms to work the blade mechanism (red arrows).

Before you remove the arms take note of the dot hidden in the silkscreen area of the lower windshield (red arrow).
Figure 2

Before you remove the arms take note of the dot hidden in the silkscreen area of the lower windshield (red arrow). The wipers must be aligned within an inch of this dot (yellow lines) when in the off position.

Remove the plastic cover over the driver side arm (red arrow).
Figure 3

Remove the plastic cover over the driver side arm (red arrow). It just snaps off.

Use a trim removal tool and pry the caps off the two arms for the passenger side (red arrows).
Figure 4

Use a trim removal tool and pry the caps off the two arms for the passenger side (red arrows).

Use a 16mm socket.
Figure 5

Use a 16mm socket. Holding the arm in place loosen the nut (red arrow). Careful working around the windshield and the hood, as you do not want to damage them. Do the same to the two nuts on the passenger side.

Sometimes the arms can be wiggled and pulled off the mechanism.
Figure 6

Sometimes the arms can be wiggled and pulled off the mechanism. On our project car we had to use a puller. If you need to use a puller a simple tie rod separator will do. Leave the nut on the last couple of threads (red arrow) to keep the puller in place. Then pop the arm off.

With the arms free you can remove the wiper and arms on both sides.
Figure 7

With the arms free you can remove the wiper and arms on both sides. Again use caution so as to not damage the windshield or hood.

There are four plastic push/pull clips on the cowl or rain diverter (red arrows).
Figure 8

There are four plastic push/pull clips on the cowl or rain diverter (red arrows).

Use a trim removal tool and carefully pry the pin out from the base.
Figure 9

Use a trim removal tool and carefully pry the pin out from the base. Then pull the whole clip out.

You can also use a small Philips head screwdriver to unscrew the clips but they are plastic and tend to strip out the heads pretty quick.
Figure 10

You can also use a small Philips head screwdriver to unscrew the clips but they are plastic and tend to strip out the heads pretty quick.

The cowl or rain diverter clips into a metal channel (red arrow) on the bottom of the windshield.
Figure 11

The cowl or rain diverter clips into a metal channel (red arrow) on the bottom of the windshield. Start at one side and carefully lift the plastic cowl up and out from the windshield (yellow arrow).

Flip the cowl over and pull the nearest washer nozzle out and separate the fluid hose from the washer fluid tank by pulling it back and off (red arrow).
Figure 12

Flip the cowl over and pull the nearest washer nozzle out and separate the fluid hose from the washer fluid tank by pulling it back and off (red arrow).

There is a brace (yellow arrow) from the top of the left wheel well that mounts on two studs under the windshield (green arrows).
Figure 13

There is a brace (yellow arrow) from the top of the left wheel well that mounts on two studs under the windshield (green arrows). Use an E12 and remove the single bolt (red arrow). This will allow you to lift the brace. From there it simply pulls straight off the studs under the windshield.

Disconnect the electrical connection from the wiper motor by squeezing in the tab and pulling it off (red arrow).
Figure 14

Disconnect the electrical connection from the wiper motor by squeezing in the tab and pulling it off (red arrow).

Use a 13mm socket and remove the two nuts on the base of each arm (red arrow).
Figure 15

Use a 13mm socket and remove the two nuts on the base of each arm (red arrow).

Use a 13mm socket and remove the long bolt that sits in the rubber isolator by the motor (red arrow).
Figure 16

Use a 13mm socket and remove the long bolt that sits in the rubber isolator by the motor (red arrow).

You can now lift the unit out.
Figure 17

You can now lift the unit out. Again use care so as to not damage the windshield or hood.

If you need to replace the two isolators the unit sits on use a set of long handled needle nose pliers and turn the isolator (red arrow) counter-clockwise until it unscrews from the chassis.
Figure 18

If you need to replace the two isolators the unit sits on use a set of long handled needle nose pliers and turn the isolator (red arrow) counter-clockwise until it unscrews from the chassis. Installation is the reverse of removal.

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