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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:
Patrick Comments: Mercedes 2010 C250 BlueEfficiency A/C Fan Not Working
After a real hard slog trying to find some good information regarding the heater fan not working on my 2010 Mercedes BlueEfficiency C250 Sport, this is an update to the great info above.
I followed the above to the latter again like a few others I hit a stumbling block when it come to getting the fan out, the fan will not twist all the way anti clockwise, the problem being the glove box is stopping it! so it become very easy when you know what to do!!!! remove all the screws from the glove box 5 in all, then slide the glove box just about an 1 1/2 forward and presto the fan fully turns and drops out. just watch the wire connections, what I did was to remove the 2 screws from the bottom of the fan and left the remaining 2 wires attached to the casing dangling.
I had a fantastic result I cleaned the fan up, by blowing a lot of crap from within squirted some of that magical formula WD40 around the bearings gave it about 15 mins. and turned the fan left and right a few times and it released it, then blew my airline across the fan got it to spin, put it all back together works a treat job done I saved myself a few hundred pounds so well chuffed. Hope this helps everyone with the same problem.
June 22, 2017
  Followup from the Pelican Staff: Thanks for sharing your repair process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
friteetloche Comments: I confirm what MasterGoa said about facelift models. There are few differences with pre-facelift models.
First the "kick panel" as you call it has some kind of a "hook" that attaches to the side of the motor. In order to unlock it you need to slide the panel to the left or if you know exactly where it is located you can push just the hook to the left through the the panel as there is a hole at the bottom of it.

the the purple connector is attached horizontally on the motor. To remove it you need first to disconnect the two sockets then slide the one attached to the motor first push the security tab.

But the big difference is that you can not twist the motor far enough to release it with the glove box in place. To remove it there are 4 screws on the upper edge inside the glovebox and 2 more beneath
June 7, 2017
  Followup from the Pelican Staff: Thanks for sharing your info and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
Stockis Comments: Hello
The problem is not the tab, but that the bracket that is supposed to twist out from a console hits the glove compartment.

I guess this pertains to the facelifted version as I have it on my 2011 and the connectors also look slightly different.
June 6, 2017
  Followup from the Pelican Staff: Try rotating to disengage motor, then rotate back to clear bracket you highlighted in picture. - Nick at Pelican Parts  
Szelas73 Comments: Hi guys, I would need some info on blower relay...

I notice that my C300 blower keeps running after car is off, key from ignition is out and climate control is off as well... it was running to the point it drained my battery...
I wonder if it's blower relay issue? Do you guys know location for blower relay?? is it build in into blower because I couldn't find it on fuse/relay diagram. I would appreciate any help with locating that relay or part number... thx in advance.
June 5, 2017
  Followup from the Pelican Staff: I would assume the issue is with the blower resistor . final stage unit. I would replace it.- Nick at Pelican Parts  
roddash Comments: hi i have a 2012 c220 and i am trying to remove the blower motor,it went fine till the twisting part but i can't twist it far enough round because the wires in the purple connecting block are holding it back, the problem is i can't figure out how to disconnect it.i have disconnected the other two blocks.help please
May 22, 2017
  Followup from the Pelican Staff: There is a small plastic tab on the purple connector. Press the tab and hold while pulling the connector out. See attached, yellow arrow pointing to it. - Nick at Pelican Parts
Jsquibs Comments: Great instructions! I got all the way to pulling the blower motor out. I've got an 08 c300 and it seems to be stuck even when i try to wiggle it out as I'm pulling and twisting. I did pull the tab and twist over the locking tab and now the glove box cooling tube is free from its locks too. At this point it appears nothing is keeping it secure but will not come out. It may just be my technique but regardless, overall good instructions
March 14, 2017
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
rainmaster Comments: Thanks, had the panel stripped down and could not work out how the blower came out, saw this and followed the instructions re the tab, motor came out no problem, did not need to remove glove box. vehicle E350 s212 2012. Carl
January 26, 2017
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
jbhill2 Comments: I also had an issue with the tab, it twists to a point then it bumps against the frame and cannot go further, I didn't want to force it. If you look, there is an arrow on the tab and another arrow on the frame that need to line up, I think, before you can pull it down and out. However I was unable to get it to turn that far.

December 23, 2016
  Followup from the Pelican Staff: is it stuck on the lip? You may have to pop it over. If binding, try installing it in a different position, closer to the arrow alignment. - Nick at Pelican Parts  
paul Comments: 2008 mercedes benz c300 how to allign the blower motor under the dashboard before twisting in correct position
December 12, 2016
  Followup from the Pelican Staff: Install so the electrical connectors are on the left side. - Nick at Pelican Parts  
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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Page last updated: Thu 10/19/2017 03:09:20 AM