Audi A6/Allroad/RS6/S6 Heater Core 4B1819031C

OEM Part #: 4B1-819-031-C (4B1819031C)

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The Heater Core, OEM part number 4B1819031C, is an essential component located inside the HVAC box of your Audi. Its primary function is to heat the cabin air by allowing coolant to flow through it, thus providing warmth during colder months. Common issues that necessitate replacement include coolant leaks, clogging, or failure to produce heat, which impacts overall comfort inside the vehicle. This part is compatible with various Audi models, including the A6 (1998-2004), S6 (2002-2004), RS6 (2003-2004), and Allroad Quattro (2001-2005), all with specified engine options. Other terms for this part may include HVAC Heater Core or Heatercore. Replacement part numbers include 4B1820511K, 4B1819164, and 4B1820021B.

These can commonly leak or get clogged. If it is clogged you will have very little or no heat inside the vehicle.

Specifications

Specifications for Heater Core 4B1819031C
Fits Vehicle ModelA6, Allroad, RS6, S6
Fits Vehicle MakeAudi
OEM Part No4B1-819-031-C (4B1819031C)
CategoryHVAC / Climate Control

Compatible Vehicles

Fits 40 vehicle configurations across 1 make, 1998-2005.

Check your specific vehicle before ordering. This list shows year, make, and model. Some years have multiple trims or engines that use different parts, and individual listings may have additional fitment notes (e.g. “with sunroof only”). Review the full variant list below, or message us with your VIN and we’ll confirm the match.

Audi

  • A6 1998-2004 · 30 variants 3 with notes
  • Allroad 2001-2005 · 7 variants
  • RS6 2003
  • S6 2002-2003 · 2 variants
View all 40 vehicle configurations — 3 with fitment notes
Full vehicle fitment list for Heater Core 4B1819031C
Year Make Model Trim Engine Note
1998 Audi A6 Sedan 2.8L V6
1998 Audi A6 Quattro Sedan 2.8L V6
1999 Audi A6 Sedan 2.8L V6 For Vehicles Where Last 6 Digits of VIN Number are Greater Than 025001
1999 Audi A6 Quattro Wagon 2.8L V6 For Vehicles Where Last 6 Digits of VIN Number are Greater Than 025001
1999 Audi A6 Quattro Sedan 2.8L V6 For Vehicles Where Last 6 Digits of VIN Number are Greater Than 025001
2000 Audi A6 Sedan 2.8L V6
2000 Audi A6 Quattro Wagon 2.8L V6
2000 Audi A6 Quattro Sedan 2.7L V6 Turbo
2000 Audi A6 Quattro Sedan 2.8L V6
2000 Audi A6 Quattro Sedan 4.2L V8
2001 Audi A6 Sedan 2.8L V6
2001 Audi A6 Quattro Wagon 2.8L V6
2001 Audi A6 Quattro Sedan 2.7L V6 Turbo
2001 Audi A6 Quattro Sedan 2.8L V6
2001 Audi A6 Quattro Sedan 4.2L V8
2001 Audi Allroad Quattro Wagon 2.7L V6 Turbo
2002 Audi A6 Sedan 3.0L V6
2002 Audi A6 Quattro Wagon 3.0L V6
2002 Audi A6 Quattro Sedan 2.7L V6 Turbo
2002 Audi A6 Quattro Sedan 3.0L V6
2002 Audi A6 Quattro Sedan 4.2L V8
2002 Audi Allroad Quattro Wagon 2.7L V6 Turbo
2002 Audi S6 Wagon 4.2L V8
2003 Audi A6 Sedan 3.0L V6
2003 Audi A6 Quattro Wagon 3.0L V6
2003 Audi A6 Quattro Sedan 2.7L V6 Turbo
2003 Audi A6 Quattro Sedan 3.0L V6
2003 Audi A6 Quattro Sedan 4.2L V8
2003 Audi Allroad Quattro Wagon 2.7L V6 Turbo
2003 Audi RS6 Sedan 4.2L V8 Turbo
2003 Audi S6 Wagon 4.2L V8
2004 Audi A6 Sedan 3.0L V6
2004 Audi A6 Quattro Wagon 3.0L V6
2004 Audi A6 Quattro Sedan 2.7L V6 Turbo
2004 Audi A6 Quattro Sedan 3.0L V6
2004 Audi A6 Quattro Sedan 4.2L V8
2004 Audi Allroad Quattro Wagon 2.7L V6 Turbo
2004 Audi Allroad Quattro Wagon 4.2L V8
2005 Audi Allroad Quattro Wagon 2.7L V6 Turbo
2005 Audi Allroad Quattro Wagon 4.2L V8

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