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Pelican Technical Article:

Blower Motor Replacing

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

****

Tools:

Phillips head screwdriver, T20 Torx driver

Applicable Models:

Mercedes-Benz W211 (2003-09)

Parts Required:

Blower motor

Hot Tip:

Use a T20 Torx socket for the rear fasteners

Performance Gain:

Proper working blower motor

Complementary Modification:

Replace cabin air filter

The blower motor controls air flow into the passenger cabin in conjunction with the blower motor resistor (final stage). It is mounted in the heater housing behind the right side of the dashboard. The blower motor speed is adjusted via the HVAC control panel through the blower motor final stage. The HVAC control panel receives a request from the driver or passenger, then sends a serial data signal to the blower motor final stage unit to the blower motor.

If your blower motor fails and replacing the final stage unit has not remedied the problem, the blower motor itself is likely at fault. Over time, a blower motor may become noisy as the motor electrical contacts wear. I have also seen debris from a rodent get trapped in the blower cage creating a vibration or noise. If your blower is noisy, pull it down and see if there is something stuck in it. If you find debris, be sure to clean out the HAVC housing before installing the new blower motor.

If you're not sure which part is faulty, see our tech article on blower motor and final stage unit testing.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Working below the glove box, remove two T20 Torx lower trim panel fasteners (red arrows).
Figure 1

Working below the glove box, remove two T20 Torx lower trim panel fasteners (red arrows). The fasteners shown are Phillips head screws, however they should be T20 Torx. Someone has replaced them with the incorrect fastener.

Detach the lower corner of the lower trim piece (red arrow) by pulling it down until the retaining lug disengages.
Figure 2

Detach the lower corner of the lower trim piece (red arrow) by pulling it down until the retaining lug disengages. Pull the lower trim panel down from the dashboard far enough to access the footwell light electrical connector (yellow arrows). Disconnect the footwell light electrical connector by squeezing the release tab and pulling it straight out of the light. Then remove the trim panel from the vehicle. Be sure to store it in a safe place. 

Next, the lower blower motor cover (red arrow) has to be removed.
Figure 3

Next, the lower blower motor cover (red arrow) has to be removed.

Start by pulling the wiring harness out of the retaining tabs (red arrow).
Figure 4

Start by pulling the wiring harness out of the retaining tabs (red arrow). Then disconnect the electrical connect by squeezing release tab and pulling straight out of blower motor (inset).

Working at the blower motor cover, remove the four T20 Torx fasteners (red arrows).
Figure 5

Working at the blower motor cover, remove the four T20 Torx fasteners (red arrows).

Remove the blower motor cover from the blower and store in a safe place.
Figure 6

Remove the blower motor cover from the blower and store in a safe place.

Leave the blower motor resistor attached to the blower motor for now (yellow arrow).
Figure 7

Leave the blower motor resistor attached to the blower motor for now (yellow arrow). Some blower motors come complete with a resistor and you not have to remove it. Working at the blower motor, remove the four T20 Torx fasteners (red arrows). Support the blower motor from below as you remove the final two fasteners.

Remove the blower motor from the HVAC housing.
Figure 8

Remove the blower motor from the HVAC housing. Once removed, do not store it with the blower cage facing down.

If your blower motor did not come with a preinstalled final stage unit, you will have to transfer it over now.
Figure 9

If your blower motor did not come with a preinstalled final stage unit, you will have to transfer it over now. Place the blower motor on a workbench, or the floor of the vehicle as shown. Disconnect the blower motor final stage unit electrical connector (red arrows) by squeezing the release tabs and pulling it straight out of the blower motor final stage unit. Then, remove the two T20 Torx fasteners (yellow arrows).

Remove the final stage unit from the blower motor and transfer it over to the new blower motor.
Figure 10

Remove the final stage unit from the blower motor and transfer it over to the new blower motor.

If you are performing this repair due to a blower motor noise or vibration, inspect the blower motor cage (red arrow) for damage or debris.
Figure 11

If you are performing this repair due to a blower motor noise or vibration, inspect the blower motor cage (red arrow) for damage or debris. If damaged, try to locate what came in contact with the cage to cause the damage. If there is debris, clean it out, then clean out the HVAC housing. Once clean reinstall it and check to see if the vibration is gone. If not, replace the blower motor.

If you need to clean out your blower motor housing, reach up into the housing (red arrow) and clear the debris.
Figure 12

If you need to clean out your blower motor housing, reach up into the housing (red arrow) and clear the debris. Then remove the cabin filter and work your way toward the blower motor cavity, removing any debris. See our tech article on cabin microfilter replacing. Install the blower motor in the reverse order of removal. Be sure that the blower motor aligns properly and all wires are routed as they were before. Install the interior trim panels and confirm the proper blower operation.


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Comments and Suggestions:
E 55 V8 KOMPRESSOR Comments: Super super guide mine was starting being noisy at stage 2-5 annoying. Removed it cleaned it out was black now all white. Sprayed electrical cleaner at the bearing putting it upside down supporting so it doesn't stand on the fins and then SuperCharger oil at the bearing button let it rest over the night cleaned exes I've and wooow spins like a pussy cat happy result how long it will last only time will tell but will be back if and when it starts making noise again
October 22, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
E 55 V8 KOMPRESSOR Comments: Just one question the Condenser can u clean it for bad odur?
Where is it locatad?
October 19, 2016
  Followup from the Pelican Staff: The evaporator, is probably what you mean. If there is an odor, the drain may be restricted. Try clearing it. Then using a spray to remove the odor. Special deodorizers are available. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
E 55 V8 KOMPRESSOR Comments: Very very helpfull. Info I got first was to remove all trim.above including glove compartment this is really easy rather many other Mercedes is a pain. Thanks pelican but got the E55 AMG not sure if is quit the same but looks like a lot like it. Filter is in engine bay very easy to replace all in all I myselfe appricate much of the w211 design for us do it yourself people the w211 is a blessing :
October 19, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
joe Hundt Comments: my blower motor would not blow at all, I replaced the final stage unit and now the blower motor only blows high and does not turn off at all, even with the key off.
August 1, 2016
  Followup from the Pelican Staff: Sounds like a faulty control module or defective final stage. - Nick at Pelican Parts  
Cemsguy Comments: My blower squeaks at middle speeds... Should I plan on replacing the motor or will some cleaning cure it?
May 16, 2016
  Followup from the Pelican Staff: The motor is likely faulty. Cleaning probably won;t help.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Dr. Skillz Comments: The lower trim fasteners as seen in Figure 1 are held in by two T25 Torx.
November 27, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 

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Page last updated: Thu 4/27/2017 02:45:22 AM