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Blower Motor Resistor Replacement
 
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Pelican Technical Article:

Blower Motor Resistor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$90 to $300

Talent:

***

Tools:

T20 Torx driver, pliers

Applicable Models:

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

Parts Required:

Blower motor resistor

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 your motor starts to run at odd speeds all by itself or will only run at slow or flat-out there is a good chance the blower motor resistor is going bad. Changing out the resistor is easy and can be accomplished in under an hour even the first time you do it.

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

The blower motor resistor 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.

The blower motor resistor (red arrow) is located under the dash close to the tunnel and beside the blower motor (yellow arrow).
Figure 5

The blower motor resistor (red arrow) is located under the dash close to the tunnel and beside the blower motor (yellow arrow).

Squeeze in the tabs on the electrical connection (red arrows) and remove the connection from the resistor.
Figure 6

Squeeze in the tabs on the electrical connection (red arrows) and remove the connection from the resistor.

You are going to be turning the resistor counter-clockwise.
Figure 7

You are going to be turning the resistor counter-clockwise. Use a set of pliers and grasp the resistor by the knob on the bottom of it (red arrow) and turn it.

With the resistor out of the vehicle you can see the knob that will be helpful for turning with the pliers (red arrow).
Figure 8

With the resistor out of the vehicle you can see the knob that will be helpful for turning with the pliers (red arrow). There is an arrow on the resistor (yellow arrow) that indicates the direction for installation.

Installation is the reverse of removal.
Figure 9

Installation is the reverse of removal.


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Comments and Suggestions:
Doug Comments: about the aspirator pump removal...tthis was on another forum, not yours..re comment above my mistake..great info here. benzworld i think..
January 30, 2016
  Followup from the Pelican Staff: Thanks. - Nick at Pelican Parts  
Doug Comments: Thanks so much..I just removed the little climate system aspirator pump on my e320 and found my car had some fasteners holding the trim in which neccesitated removing the air vent to dissasemble.to get to these screws and remove the lower panel...Your car apparently did not have these screws.I will add a note on that tutorial..
January 29, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Doug Comments: it would be cool to have this tutorial for the e320 model mercedes which is configured differently..
January 28, 2016
  Followup from the Pelican Staff: Check here:

http://www.pelicanparts.com/techarticles/MBZ_Tech_Index-W211.htm - Nick at Pelican Parts
 

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