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Pelican Technical Article:

Blower Motor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$90 to $300

Talent:

***

Tools:

T20 Torx driver, rag

Applicable Models:

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

Parts Required:

Blower motor

Hot Tip:

Get comfortable under the dash

Performance Gain:

Functioning climate control

Complementary Modification:

Change the cabin air filter

The blower motor and resistor move the air through the HVAC system. If you are starting to hear a whining sound when the motor is running or the motor doesn't run at all there is a good chance that the motor is going bad. All kinds of things can end up in the top of the motor so at the very least you should remove the motor, inspect it for debris and clean out the housing.

The blower motor is located in the passenger side footwell.
Figure 1

The blower motor is located in the passenger side footwell. To access it you must first remove the kick panel or protective piece that is up under the dash. Use a T20 Torx and remove the three screws holding it in place (red arrows) and pivot it down at the front.

Disconnect the electrical connection for the footwell light (red arrow).
Figure 2

Disconnect the electrical connection for the footwell light (red arrow).

Pull out the connection for the footwell temperature sensor (red arrow).
Figure 3

Pull out the connection for the footwell temperature sensor (red arrow).

You can now slide the piece all the way down and then pull it out.
Figure 4

You can now slide the piece all the way down and then pull it out.

There are two electrical connections attached to the blower motor; release the small tabs (red arrows) on the connections and slide them off the motor.
Figure 5

There are two electrical connections attached to the blower motor; release the small tabs (red arrows) on the connections and slide them off the motor.

Next gently pull down on the tab on the side of the blower motor (red arrow).
Figure 6

Next gently pull down on the tab on the side of the blower motor (red arrow). With the tab pulled down turn the motor clockwise and wiggle and pull it down and out of the housing.

With the motor out of the vehicle you can better see the tab you will be gently pulling down on (red arrow).
Figure 7

With the motor out of the vehicle you can better see the tab you will be gently pulling down on (red arrow).

The housing goes up to the air box in the engine compartment (red arrow).
Figure 8

The housing goes up to the air box in the engine compartment (red arrow). Make sure to clean the housing, as all kinds of things can get in there.

You can try lubricating the bearing on the cage but most motors fail because of the brushes wearing out or the bearing completely failing.
Figure 9

You can try lubricating the bearing on the cage but most motors fail because of the brushes wearing out or the bearing completely failing. Unlike some of the older Mercedes models you cannot replace just the motor. The new unit comes complete with the motor and cage. Installation is the reverse of removal.



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Comments and Suggestions:
MasterGoa Comments: I was able to confirm that you DO need to remove the glove box with my model.
I removed it as explain on your site, however note that a last screw exists on the left side of the glove box cavity, hidden
by the glove box door. A 1/4 inch ratchet wrench was needed to fit
in that tight space.
Once removed, the blower motor twisted right off without issues.
July 18, 2016
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
Tony Comments: Is the tab the only thing holding the blower housing in place. I did not see where there were any screws to be taken out?
July 18, 2016
  Followup from the Pelican Staff: Yes, the article does not mention fasteners. - Nick at Pelican Parts  
MasterGoa Comments: Hey guys, thank you so much for the step by step!

After a failure of the blower in my 2011 Facelift C300, I tried
to remove it. All the steps worked except for the very last one:
I could not twist the motor free as it seems the retaining tab
that hold the motor in place hit the glovebox frame.

Do you have any recommendations?
Also, to people experiencing this issue, unplugging and replugging the 3 plugs seems to have cure the problem... For now.
July 6, 2016
  Followup from the Pelican Staff: Try unlocking the tab. It may pop into the housing or have to pop over a ridge, as you rotate it. - Nick at Pelican Parts  

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