The blower motor is an essential part of your Mercedes-Benz's HVAC system or any car for that matter. It distributes hot or cold air through the ventilation system of your car. If you're experiencing loud "whirring", squeaks, or rattling when you crank up your heat or A/C, your blower motor likely needs to be replaced.
Mercedes-Benz models and years applicable:This HVAC blower motor replacement kit fits a range of Mercedes W211s, including:
What are the symptoms of a bad HVAC blower motor?
- Squeaking or high pitched sounds when running the A/C or heat
- Low or no air output from your vents
Usually the HVAC system blower motor doesn't fail completely. Instead, as the motor ages, it becomes noisy. When it does, you might experience loud squeaking or "whirring" coming from your ventilation system. This is due to the bearing on the motor shaft using up the service life of the grease.
Mercedes-Benz doesn't have a service interval on the HVAC blower motor. However, you will probably start to hear it failing around the 70,000 mile mark.
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.
How much does it cost to replace my HVAC blower motor?
If you plan to take your car to the dealer to replace the blower motor, you'd be looking at it costing north of $650. By purchasing the parts through us and doing this job yourself, you will only pay half that. Plus, when you need to replace them again, you can make use of our Lifetime Replacement Guarantee.
Tools required to replace your HVAC blower motor:
Parts required to replace your HVAC blower motor:
Steps required to replace your HVAC blower motor:
Step 1: Setup to complete the job
To gain access to work on the blower motor, you need to move some things out of your way. Push your passenger's side seat all the way back and remove the carpets.
Step 2: Remove the plastic kick panel
The next thing in your way is the plastic kick panel underneath the glovebox. To remove it, you will need to remove the two T25 fasteners. There's one clip that holds it in place, so just pull down lightly until it pops out.
Step 3: Disconnect the blower motor resistor connection
There's one connector that supplies power to the blower motor resistor. To continue, this has to be removed.
Step 4: Remove the blower motor cage
The blower motor cage is held in place by four T20 fasteners. You can't really see these fasteners, so you will have to feel for the tool falling into place.
Step 5: Remove the blower motor assembly
The blower motor assembly itself is held in place by another four T20 fasteners. When you take this assembly out, make note of the position and orientation of all of the components to make installation easier.
Step 6: Install the new resistor on the new blower motor
Now you can get ready to install your new blower motor assembly in the car. The first thing you have to do is remove the fasteners that hold the resistor to the blower motor to use on the new one. These are just two T20 screws.
When installing the resistor, note that these screws are essentially self-tapping. The last step is plugging in the new resistor to the new blower motor.
Step 7: Install the new blower motor in the car
The install process is simply reverse of the steps above. There is nothing unique about this process.
This is one of those fairly straightforward jobs with not much that can go wrong. You should be good as new with a fully functioning, and quiet, HVAC blower motor.
Writer/Editor at FCP Euro and owner of a daily R53 MINI Cooper, a track-built R53 MINI, and a 1997 Dakar Yellow E36 M3 Sedan. ••• Instagram: @evan.madore