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Windshield Washer Reservoir, Pump and Level Sender Replacement
 
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Pelican Technical Article:

Windshield Washer Reservoir, Pump and Level Sender Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$15 to $200

Talent:

**

Tools:

10mm, 8mm socket, floor jack, jack stands, wheel chocks, safety glasses

Applicable Models:

Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

New reservoir, pumps, gaskets, sender, fluid

Hot Tip:

Save the drained fluid to a clean container

Performance Gain:

You can see out the front windshield

Complementary Modification:

New windshield wipers

The windshield reservoir on the Mercedes C350 has the level sensor, windshield fluid pump and on some models the headlight washer pump all attached to it. Our project car did not come with the headlight washers so in this article we will show you how to remove and replace the windshield pump, the level sender as well as the reservoir itself. The reservoir is located in the front left corner of the vehicle and the pump sits on the outside of the reservoir itself.

You will need to safely jack up and support your Mercedes to change out the reservoir so please see our article on safely lifting and supporting your vehicle.

Before you begin use a fluid pump and suck as much fluid form the reservoir as you can. The pump is right near the bottom of the reservoir so any liquid above the pump line will spill out when you remove it.

Reservoir- Begin by releasing the two push/pull pins (red arrows) from the trim piece above the left front headlight and remove the trim piece.
Figure 1

Reservoir: Begin by releasing the two push/pull pins (red arrows) from the trim piece above the left front headlight and remove the trim piece.

Reservoir- Use a 10mm socket and remove the bolt that holds the reservoir brace in place (red arrow).
Figure 2

Reservoir: Use a 10mm socket and remove the bolt that holds the reservoir brace in place (red arrow).

Reservoir- Reach in and remove the reservoir brace (red arrow).
Figure 3

Reservoir: Reach in and remove the reservoir brace (red arrow).

Reservoir- Move the purge valve off of its mount (red arrow) and remove the 10mm bolt on the reservoir support (yellow arrow).
Figure 4

Reservoir: Move the purge valve off of its mount (red arrow) and remove the 10mm bolt on the reservoir support (yellow arrow).

Reservoir- You now need to safely raise and support the vehicle.
Figure 5

Reservoir: You now need to safely raise and support the vehicle. Please see our article on safely jacking up and supporting your Mercedes. Remove the 8mm nut that holds the front wheel well liner to the under tray (red arrow).

Reservoir- Remove the front wheel well liner by removing the three push/pull pins (red arrows), the three 10mm plastic nuts (yellow arrow), and unscrew the connector between the front and rear liner (green arrow).
Figure 6

Reservoir: Remove the front wheel well liner by removing the three push/pull pins (red arrows), the three 10mm plastic nuts (yellow arrow), and unscrew the connector between the front and rear liner (green arrow).

Reservoir- Remove the front liner from the wheel well.
Figure 7

Reservoir: Remove the front liner from the wheel well.

Reservoir- Next you need to remove the pump (red arrow) by pulling it straight up and out from the reservoir.
Figure 8

Reservoir: Next you need to remove the pump (red arrow) by pulling it straight up and out from the reservoir. If you have drained the reservoir be prepared for any fluid remaining that is above the pump line to flow out.

Reservoir- Leave the pump connected to the electrical connection and line.
Figure 9

Reservoir: Leave the pump connected to the electrical connection and line. Pull the side light electrical wiring from the reservoir (red arrow), and move it off to the side.

Reservoir- Use a 10mm socket and remove the lower mounting bolt (red arrow).
Figure 10

Reservoir: Use a 10mm socket and remove the lower mounting bolt (red arrow).

Reservoir- Pull the reservoir down (red arrow) enough so you can turn it and access the level sender on the front.
Figure 11

Reservoir: Pull the reservoir down (red arrow) enough so you can turn it and access the level sender on the front.

Reservoir- Disconnect the electrical connection and completely remove the reservoir.
Figure 12

Reservoir: Disconnect the electrical connection and completely remove the reservoir. Installation is the reverse of removal. Don't forget to fill the reservoir.

Reservoir Level Sender- Begin by sucking as much fluid as you can from the reservoir.
Figure 13

Reservoir Level Sender: Begin by sucking as much fluid as you can from the reservoir. Next follow steps 5-7. You can change the level sender while the reservoir is mounted in the vehicle. It is located on the lower front side of the reservoir. Begin by disconnecting the electrical connections (red arrow).

Reservoir Level Sender- The sender just pulls out from the reservoir and the new one just pushes straight in.
Figure 14

Reservoir Level Sender: The sender just pulls out from the reservoir and the new one just pushes straight in. There is a notch in the reservoir and a nub in the sender to make sure you get the sender properly oriented (red arrows).

Pump- Begin by sucking as much fluid as you can from the reservoir.
Figure 15

Pump: Begin by sucking as much fluid as you can from the reservoir. Next follow steps 5-7. You can change the pump while the reservoir is mounted in the vehicle. It is located on the lower rear side of the reservoir (red arrow).

Pump- Simply pull the pump straight up and out from the reservoir, disconnect the electrical connection on the top (red arrow) and the fluid line from the bottom (yellow arrow).
Figure 16

Pump: Simply pull the pump straight up and out from the reservoir, disconnect the electrical connection on the top (red arrow) and the fluid line from the bottom (yellow arrow). Installation is the reverse of removal. Do not forget to fill the reservoir.

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