Audi VW HVAC Heater Core - Genuine Audi VW 5WA819031

Product Information

The HVAC heater core is a small radiator-like component located within the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. It transfers heat from the engine coolant into the cabin, warming the air that passes through the HVAC system and providing heat to the vehicle’s interior. As hot coolant flows through the heater core, the blower motor pushes air over it, and the heated air is then directed into the cabin.

• Weak or No Heat in the Cabin: If the heater core is partially or fully clogged, the warm air may not reach the cabin effectively, resulting in weak or no heat even when the heater is turned on high
• Sweet or Musty Smell in the Cabin: The heater core contains engine coolant, which has a distinctive sweet smell. If there’s a leak, you may notice this odor inside the car. Over time, this smell can become musty as the leaking coolant sits in the ventilation system
• Fogged-Up Windows: A leaking heater core can allow coolant to enter the HVAC system, which then evaporates onto the windshield, causing a foggy or hazy layer on the inside of the windows. This fog is often sticky and hard to wipe away.

About Genuine VW Audi

The Volkswagen Group, also known as “VAG”, consists of Volkswagen, Audi, Lamborghini, Bentley, Bugatti, Porsche, Ducati, MAN, Scania, SEAT, and Skoda. The original parts used by VAG to build your car are available as replacement parts under the “Genuine VAG” brand. Manufactured under the direction of VAG, expect excellent quality and a premium price since these parts are available exclusively through the VAG Dealership network.

You may not realize this, but the parts that make up your VAG are not necessarily manufactured by VAG. No cause for concern, as VAG designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for VAG for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine VAG parts box and find an OEM branded part inside, simply with the addition of a VAG logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.