Mercedes-Benz W140 fresh air filter
S 320 L
Where is the W140 fresh air filter and how is it replaced?
The filter is in front of the windscreen under the bonnet, in the air intake housing on the front passenger side. Opening the large Phillips screws is enough, and the filter comes out. The recirculation filter is in the passenger footwell.
Can the fresh air filter be washed?
An old filter can be washed: vacuum it first, then rinse it in wash water without scrubbing and let it dry well. Blowing with compressed air is not suitable, because the fibres clog.
Why does water or debris get into the fresh air filter?
The lower end of the tray's drain hose is a narrow funnel, and the hose has a 90-degree bend. Dirt and leaves easily clog them, so the water stays in the tray and soaks into the filter. Keep the drain hose clean.
Related articles
Mercedes-Benz W140 crumbling engine wiring harness insulationMercedes-Benz W140 ASR light comes on and the car goes into limp modeMercedes-Benz W140 ABS and ETS light on: wheel speed sensorMercedes-Benz W140 base module faults and symptomsMercedes-Benz W140 heater blower regulatorMercedes-Benz W140 heater blower not workingMercedes-Benz W140 central locking vacuum pump not workingMercedes-Benz W140 door will not open from the inside handle