In this guide, you will find step-by-step instructions on how to replace the blower motor on a Mercedes Benz S-Class W221.
- The defective aircon blower motor is weaker than usual,
- No airflow from the vents,
- Fan not working at all speeds,
- No airflow from the vents.
What you will need
- Locate the panel under the glove compartment on the front passenger side of the car.
- Loosen and remove three (3) T25 screws using a Torx screwdriver.
- Pull the panel down and remove the electrical connection for the night light.
- Bend down and pull out the panel.
- The blower motor housing is now visible; detach the blower's electrical connection by pushing the connector's tab using your fingers or using a thin flat-head screwdriver. You may use your finger or a small screwdriver to push the tab.
- Detach the blower from the frame by removing five (5) screws using a Torx screwdriver with T-handle. Please look at the blower motor housing's different perspectives to find the location of the screws.
- Pull the blower housing down.
- Take note of the orientation of the two big blind holes on the blower housing; these are oriented towards the driver side.
- Remove the screws that attach the blower resistor module to the blower motor housing using a T20 screwdriver.
- Push wires out of the way, move the blower resistor module up and down while pulling it towards you in a diagonal direction until the lock release.
- Disconnect blower wires from the blower resistor module by pulling the connector while pressing the tab (lock).
- Prepare the new blower motor.
- Connect the blower resistor module to the new blower motor assembly. Be sure to push the module until it sits on the lock at the bottom side of the blower housing.
- Reinstall T20 blower resistor module screws using a Torx screwdriver.
- Verify the blower resistor module installation.
- Install the new blower motor assembly (housing) to the frame by pushing it up while reinstalling the screws.
- Reconnect the blower's electrical connector by pushing it until it clicks.
- Reposition the panel.
- Reconnect the electrical connection for the dome light.
- Fit the panel in place while locking the tabs and re-install t25 screws for the panel.
Frequently Asked Questions
Can AC run without a blower motor?
- A blower motor is an essential part of the car's air conditioning system; without the blower motor, the cold air will be limited to the evaporator and will not circulate thru the car's cabin.
What can cause a blower motor to stop working?
- The blower motor may not work due to a faulty A/C module, blown a fuse, dirty blower fan, and a worn-out motor.
How much does it cost to replace a Mercedes Aircon blower motor?
- The average cost for a Mercedes-Benz blower motor replacement is between $680 and $703. Labor costs are estimated between $90 and $114, while parts are priced at $589.
How long will it take to replace my HVAC blower motor?
- This is one of the easier jobs you can tackle on your car. If you're doing this for your first time, you can expect to spend between 30 to 45 minutes to complete it.
- S 280 / S 300 2007–2013
- S 350 2005–2009
- S 350 (2010+ facelift) 2010–2013
- S 350 4MATIC 2007–2013
- S 450, S 450 4MATIC 2006–2013
- S 500/550 2005–2010
- S 500/550 2011–2013
- S 500/550 4MATIC 2006–2011
- S 500/550 4MATIC 2011–2013
- S 600, S 600 Guard 2006–2013
- S 600 Guard Pullman 2008–2013
- S 63 AMG 2006–2011
- S 63 AMG 2012–2013
- S 65 AMG 2006–2013
- S 250 / S 300 CDI 2009–2013
- S 300 BlueTec HYBRID 2009–2010
- S 320 CDI, S 320 CDI 4MATIC 2006–2008
- S 320 CDI BlueEFFICIENCY 2008–2009
- S 350 CDI BlueEFFICIENCY, S 350 CDI 4MATIC 2009–2013
- S 350 4MATIC BlueTec (US) 2012–2013
- S 420 CDI 2006–2009
- S 450 CDI 2009–2011
This guide also applies to the CL-Class.