In this guide, you will find step-by-step instructions on how to replace the air suspension compressor on Mercedes-Benz vehicles equipped with air (airmatic) suspension. Replacing Mercedes suspension air compressor is an easy procedure that can be performed by the vehicle owner in one hour.
It is highly recommended to replace the Mercedes air compressor relay at the same time that you replace the air compressor.
Below you will find instructions on how to replace Mercedes airmatic compressor.
Remove black plastic panel under the engine. There may be as many as 3 panels under the car. You need to remove the first panel, right after the front bumper.
Once you remove the panel you will see the air compressor right behind the front bumper, underneath the headlight on the passenger side. For demonstration purposes, we are showing pictures with the bumper removed. You do not need to remove the front bumper.
Remove the plastic airline that goes into the air compressor. Using a 12 mm wrench, turn the bolt counterclockwise.
Once the bolt is loose, pull out the airline. There is a small rubber gasket on the metal connector at the end of the threads, make sure not to damage it.
Unplug two electrical connectors that go to the air compressor.
Remove three nuts that hold the air compressor in place using 8 mm deep socket. You may want to spray penetrating oil on the nuts before you remove them. The bolts can easily break if they are rusted.
Remove the hose that connects to the intake air filter. Using your pliers slide the clamp over then pull on the rubber hose.
Remove the air compressor unit. Install the new compressor. Assemble in reverse order.
These instructions apply to most Mercedes-Benz models. The air compressor can be found on the right (passenger) front corner of the vehicle behind the bumper. It is in this location on most models including E, ML, GL, S, CLS class etc.
Mercedes-Benz air suspension compressor may fail and no longer turn on. The motor which is part of the air compressor often sizes and will no longer run even if you feed 12 volts directly to the air compressor.
In a few cases, the compressor may still run (seem to be working) but it will not generate the required pressure. In such cases, the vehicle may only partially raise and you will get an air suspension message on the instrument cluster.
Before you proceed with the replacement of the air suspension compressor, inspect the wires that go to the air compressor for damage. Also, check for a bad connector at the air compressor. Check the air compressor relay to ensure it is working properly.
Mercedes-Benz installed airmatic suspension on many models. Below is a list of models that have airmatic.
This is a partial list of the most popular models with air suspension (airmatic). There are other models that have airmatic suspension which often on some models (such as C, E Class) is an additional option and doesn't come standard.