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Power Steering Reservoir Replacement
 
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Pelican Technical Article:

Power Steering Reservoir Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$20 to $60

Talent:

***

Tools:

T30 Torx, flathead screwdriver, pliers, fluid pump

Applicable Models:

C350 (2007-14)
SLK350 (2004-14)
CLS350 (2004-14)
CLK350 (2005-14)
E350 (2005-14)
S350 (2005-14)
SL350 (2005-14)
R350 (2006-14)
ML350 (2006-14)
Viano (2005-14)
Sprinter (2006-14)
CLC350 (2008-14)
GLK350 (2008-12)

Parts Required:

Reservoir, power steering fluid, O-ring

Hot Tip:

Keep everything really clean

Performance Gain:

Proper steering

Complementary Modification:

Change cabin air filter

The power steering reservoir can develop cracks and leaks over time and will eventually need to be replaced. Replacement is not that difficult with the exception of removing the clip holding the reservoir to the return line but if you take your time you can do it.

One thing to make sure of is that you keep everything very clean while working on the power steering system. Getting even a very small piece of dirt into the system can affect performance and cause damage.

The power steering reservoir is located on the front left of the motor (red arrow).
Figure 1

The power steering reservoir is located on the front left of the motor (red arrow). To replace it you will need to remove the two air inlet ducts as well as the front engine cover (yellow arrows). Please see our article on engine cover removal for additional instruction.

You may want to remove the front trim cover for additional room.
Figure 2

You may want to remove the front trim cover for additional room. To remove the cover, turn the plastic lock (yellow arrow) 90 degrees to un-clock it. Remove the overflow and cable release from the cover (red arrow). Then pull forward on the cover on each side (green arrows) and lift the rear of the cover up and remove it.

Carefully clean the area around the fill cap on the reservoir and then open it and using a fluid pump suck as much fluid as you can from the reservoir (red arrow).
Figure 3

Carefully clean the area around the fill cap on the reservoir and then open it and using a fluid pump suck as much fluid as you can from the reservoir (red arrow). No matter how good of a job you do removing the fluid there will still be some left when you remove the reservoir so be prepared for it.

Use a quarter inch drive T30 Torx and remove the three bolts (red arrows).
Figure 4

Use a quarter inch drive T30 Torx and remove the three bolts (red arrows). The bolts will remain in the reservoir housing after you unscrew them from the motor.

The reservoir is mounted to the return line of the pump and held in place by a clip.
Figure 5

The reservoir is mounted to the return line of the pump and held in place by a clip. The clip is difficult to see when installed and impossible to photograph. Reach in behind the pump and insert a flathead screwdriver and pry the clip off (red arrow). Next pull the reservoir off the pump.

With the reservoir removed you can see where it attaches to the pump and approximately where the clip goes to hold it in place (red arrow).
Figure 6

With the reservoir removed you can see where it attaches to the pump and approximately where the clip goes to hold it in place (red arrow). Always replace the O-ring after you have removed the reservoir (yellow arrow).

Turn the reservoir over being prepared to catch the fluid that will spill out and disconnect the line hose from the rear of the reservoir.
Figure 7

Turn the reservoir over being prepared to catch the fluid that will spill out and disconnect the line hose from the rear of the reservoir. Installation is the reverse of removal. Do not forget to refill the reservoir.

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