How to Change the Cabin Air Filter on Mercedes C-Class W204 C220 C230 C250 C280 C300 C320 C350 C63
Difficulty: Beginner · About 20 min · Mercedes-benz C300
Replace the cabin air filter in a Mercedes-Benz C-Class W204 after checking whether the car uses one or more filter elements and confirming the correct part. The interior filter is accessed from the passenger footwell below the glove box.
Tools you will need
- Cabin air filter set matched to the vehicle
- Trim tool
- Small screwdriver or bit driver if required by the lower panel fasteners
Parts and supplies
- Cabin air filter element or set specified for the W204 HVAC system
Steps
Confirm the filter layout
Use the VIN and HVAC configuration to identify the correct filter set and access location. Park, switch off the ignition, and move the passenger seat back to clear the footwell.
Remove the footwell trim
Locate the lower passenger-side panel beneath the glove box. Release its fasteners and trim clips carefully, then lower the panel without pulling on nearby wiring or footwell lighting.
Open the filter housing
Find the cabin-filter access cover above the footwell and release its clips or screws. Note the direction of the old element and how any multiple filters overlap before sliding them out.
Fit the replacement filters
Remove debris from the housing and insert the new filter elements in the specified order and airflow direction. Ensure each element sits flat so air cannot bypass its edges.
Reassemble and test
Close and latch the filter cover, then refit the footwell panel and all fasteners. Run the ventilation fan at several speeds and listen for loose trim or filter movement.
Check your vehicle’s repair manual for exact specifications and fit.