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Power Steering System Flush
 
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Pelican Technical Article:

Power Steering System Flush

Steve Vernon

Time:

2 hours2 hrs

Tab:

$15 to $40

Talent:

*

Tools:

Suction pump of turkey baster

Applicable Models:

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

Parts Required:

Power steering fluid

Hot Tip:

Keep everything really clean

Performance Gain:

Proper steering

Complementary Modification:

Change cabin air filter

There are several thoughts and methods on changing the power steering fluid in a W204. The power steering system on the W204 is tightly placed in the engine compartment. Accessing the lines to do a complete drain and flush is very time consuming. Opening the system will also introduce air into it, which can cause expensive damage quickly if you do not follow the proper instructions for filling and bleeding the complete system. I recommend doing it old school and sucking out fluid, topping off the reservoir and repeating over several applications. While this will leave some of the old oil in the system it will replace the bulk of the fluid with new. It is also quicker, cheaper and a lot less messy. If you are determined to completely drain the system please see our articles on power steering pump replacement for additional assistance as well as how to properly fill and bleed the system.

The power steering pump and reservoir are located at the left front of the motor (red arrow).
Figure 1

The power steering pump and reservoir are located at the left front of the motor (red arrow). Remove the front engine cover (yellow arrow) by pulling it straight up and off from the center of the piece. Remove the left air duct by compressing it off the air filter housing and then slipping it off the duct (green arrow).

Make sure to carefully clean around the cap and reservoir (red arrow).
Figure 2

Make sure to carefully clean around the cap and reservoir (red arrow). Introducing dirt into the system is as bad as getting air in.

Begin by using a fluid pump or turkey baster and sucking out as much fluid as you can.
Figure 3

Begin by using a fluid pump or turkey baster and sucking out as much fluid as you can. If you are using a turkey baster to remove fluid you will not be able to get much out due to the size of the opening in the reservoir. I really recommend getting a fluid pump. Do NOT start the car once you have sucked fluid out but ONLY after you have added new fluid. If you manage to remove enough fluid that the level falls below the re-supply line for the pump you can introduce air into the system and then you will have to follow all of the procedures for bleeding.

Always use the correct fluid for your system.
Figure 4

Always use the correct fluid for your system. While the system does not hold a large amount if you are going to suck off fluid and replace it several times you should be prepared to use a little more than if you are just filling it. Once you run the procedures a few times the old and new fluids will mix, and you will be removing some new fluid as well.

Fill the reservoir until the level is approximately 10mm below the upper edge (red arrow).
Figure 5

Fill the reservoir until the level is approximately 10mm below the upper edge (red arrow).

Remember to keep checking the level (red arrow) and looking for air bubbles.
Figure 6

Remember to keep checking the level (red arrow) and looking for air bubbles. If you are doing it correctly you will not see any bubbles or foam in the system. If you see foam let the system "rest" by shutting if off and leaving if for a couple of hours. Then follow the procedures for bleeding.

Shut the vehicle off and repeat the entire procedures.
Figure 7

Shut the vehicle off and repeat the entire procedures. Never drain the reservoir with the motor running, and never run the motor with the system drained. After the first several drain and fills you will begin to see the fluid change color. Remember with this method you will not get all of the old fluid out from the system but this will get most of it and save you hours of work removing and disassembling components.

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