Genuine 4M0 298 403 A/C Receiver Drier Insert Desiccant Bag

The Genuine OEM 4M0 298 403 is a direct-replacement A/C receiver drier insert — also known as a drier desiccant bag — engineered specifically for Volkswagen Group (VAG) vehicles including Audi, Volkswagen, Porsche, Bentley, SEAT, and Škoda models. This is the factory-original insert that mounts within the A/C condenser assembly.

The receiver drier insert houses a desiccant material that actively absorbs moisture from the refrigerant circulating through the air conditioning system. Moisture contamination in an A/C system can cause corrosion of metal components, degraded refrigerant performance, and premature failure of compressors and expansion valves. This insert also contains a filter element that traps contaminants and particulates, protecting downstream components from damage or blockage.

Key Features:

• Genuine OEM Volkswagen Group part — exact factory replacement
• Desiccant bag design absorbs moisture from the refrigerant circuit
• Integrated filter traps contaminants and debris
• Designed to mount within the A/C condenser assembly
• Covered by a 24-month factory warranty
• Part Number: 4M0 298 403 | Also referenced as: 4M0-298-403 / 4M0298403

Important Installation Note: It is strongly recommended to replace the receiver drier insert any time the A/C system is opened or the refrigerant is discharged. Once exposed to open air, the desiccant can rapidly absorb ambient humidity, becoming saturated and ineffective. Replacing this insert during A/C service or condenser replacement is considered best practice.