Hengst E3900LI Cabin Air Filter - Front or Primary

Hengst HEZ Cabin Air Filter E3900LI

The Hengst HEZ Cabin Air Filter E3900LI is a particulate cabin air filter for Mercedes-Benz HVAC systems. It is built to filter pollen and dust from incoming air, helping maintain cleaner air inside the vehicle cabin.

Key Features

• Particulate filter media for cabin air filtration
• HEZ Cabin Air Filter line from Hengst
• Also referenced as a pollen filter or dust filter in select applications
• Direct fit coverage for a wide range of Mercedes-Benz models
• Part number: E3900LI

Product Details

The Hengst HEZ Cabin Air Filter line focuses on OE-style cabin filtration for Mercedes-Benz HVAC systems. This E3900LI filter uses particulate media to capture airborne contaminants before they enter the passenger compartment. It cross-references Monroe Shocks & Struts (e.g., CU 25 002, LA 877) for the same application. Common fitment includes Mercedes-Benz C300, E350, GLC300, GLE-Class, GLS-Class, and AMG GT models across multiple model years. If you are replacing a Mercedes-Benz cabin air filter for C300, E350, or GLC300 applications, E3900LI is a direct-reference part to verify against your vehicle’s OE number.

What It Helps Address

• Reduced airflow from a loaded cabin filter
• Dust and pollen entering the HVAC intake
• Musty or stale cabin air from restricted filtration
• Loss of HVAC efficiency caused by filter contamination
• Routine Mercedes-Benz cabin air filter replacement intervals

Installation Notes and Tips

Verify the OE number and position before ordering, since this part is listed for N/A, front, and primary applications depending on model and year. Confirm the vehicle’s cabin filter location in the HVAC housing and match the fitment notes for your Mercedes-Benz C300, G550, G63 AMG, or other listed application. Replace the filter according to the vehicle maintenance schedule or sooner in dusty or high-pollen driving conditions.

Quality Assurance

Hengst is an established filtration brand, and the HEZ Cabin Air Filter line is cataloged for OE-reference fitment across Mercedes-Benz applications. Use the OE number and fitment notes to confirm the correct replacement before installation.