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Pelican Technical Article:

Washer Fluid Reservoir Removal

Kerry Jonsson

Time:

30 minutes30 mins

Tab:

$50

Talent:

*

Tools:

Deep 10mm socket with ratchet, flathead screwdriver, pliers

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Washer fluid reservoir

Hot Tip:

Do the job with a cold engine so the heater hoses are not hot

Performance Gain:

Restore ability to use washer function while driving.
On cold snowy days ice can accumulate on your windshield reducing or eliminating visibility. Road salt and dirt can also accumulate on the windscreen while you are driving. We can go out and scrape the ice off with a scraper but if it is not too thick we can simply press the washer switch on the wiper switch. A washer pump motor sucks the washer fluid out of the reservoir, passes through hoses and sprays out the washer jets onto the windshield. A cracked washer fluid reservoir will leak out the fluid so you will have to clean the windshield by hand. Mercedes Benz uses a heated washer fluid reservoir so hot coolant can melt the washer fluid in extremely cold temperatures. When you replace the washer fluid reservoir do it when the car is cold so the heater coil in the washer fluid reservoir is cold as well. In this tech article we will go over all the steps to the replace the washer fluid reservoir.

Use a fluid suction gun to drain the washer fluid now before removing the reservoir. This will prevent spilled fluid. 

This picture illustrates the washer fluid reservoir behind the right side headlight on the right side inner fender.
Figure 1

This picture illustrates the washer fluid reservoir behind the right side headlight on the right side inner fender. You can either remove the 8mm fastener (green arrow) on the body of the car or the 10mm fastener (yellow arrow) on the washer bottle itself or both.

At the top of the washer fluid reservoir unplug the fluid level sensor by squeezing both sides of the connector (red arrows) to release the locking tabs and pull in the direction of the blue arrow.
Figure 2

At the top of the washer fluid reservoir unplug the fluid level sensor by squeezing both sides of the connector (red arrows) to release the locking tabs and pull in the direction of the blue arrow.

Grab the heating coil (green arrow), pop off the plastic cover (yellow arrow) it passes through and pull upward in the direction of the blue arrow to release it from the washer fluid reservoir.
Figure 3

Grab the heating coil (green arrow), pop off the plastic cover (yellow arrow) it passes through and pull upward in the direction of the blue arrow to release it from the washer fluid reservoir.

Lift the heater coil up further.
Figure 4

Lift the heater coil up further. You do not have to remove it. You may only want to expose the hose clamps that are on both ends of the heater coil.

You can twist around the heater until you can fully remove it from the washer bottle reservoir or you can unscrew the two hose clamps (green arrows) and remove the hoses from the heater coil.
Figure 5

You can twist around the heater until you can fully remove it from the washer bottle reservoir or you can unscrew the two hose clamps (green arrows) and remove the hoses from the heater coil.

Looking at the fender side of the washer fluid reservoir squeeze the electrical connector for the windshield washer pump motor and pull up on it in the direction of the blue arrow.
Figure 6

Looking at the fender side of the washer fluid reservoir squeeze the electrical connector for the windshield washer pump motor and pull up on it in the direction of the blue arrow. There are no locking tabs on the connector so just squeeze it and pull it straight up. You can also pull up on the washer pump motor itself in the direction of the blue arrow to remove it from the reservoir.

Looking at the front of the washer fluid reservoir, squeeze the electrical connector for the headlight washer system and pull up on it in the direction of the blue arrow.
Figure 7

Looking at the front of the washer fluid reservoir, squeeze the electrical connector for the headlight washer system and pull up on it in the direction of the blue arrow. There are no locking tabs on the connector so just squeeze it and pull it straight up. You can also pull up on the headlight washer pump motor itself in the direction of the blue arrow to remove it from the reservoir.

Lift the washer fluid reservoir straight up to remove it from the car.
Figure 8

Lift the washer fluid reservoir straight up to remove it from the car. It will slide up off a mounting bracket that passes through the bottom of it.

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Page last updated: Sun 11/19/2017 02:27:00 AM