Audi A6/S6 Heater Core Coolant Return Hose 4B3819373B
OEM Part #: 4B3-819-373-B (4B3819373B)
This page covers one exact OEM part number. Every unit we stocked has sold.
We may be able to get another
Used OEM parts are one-of-a-kind. We sometimes get another when we dismantle a matching vehicle, but we can’t say when — browse what’s in stock now:
Other Coolant Hose / Pipe / Line that may fit your vehicle
Coolant / Water Hose
$8.49
Fits 2001–2004 Audi A6 / Allroad
OEM: 078121082L
Coolant / Water Pipe / Tube
$255.00
Fits 2001–2005 Audi A6 / Allroad
OEM: 078121071CF
Coolant / Water Tube / Pipe / Line
Starting at $48.99
Fits 1996–2005 Audi & Volkswagen
OEM: 078121075AB
Coolant Hose / Line
$16.99
Fits 1998–2005 Audi & Volkswagen
OEM: 078121096L
Coolant Hose / Line
$19.99
Fits 1998–2005 Audi & Volkswagen
OEM: 078121188A
Coolant Hose / Line
$16.99
Fits 1998–2005 Audi & Volkswagen
OEM: 078121188B
- Genuine OEM — real photos
- 30-day returns on eligible parts
- eBay Top Rated · 100,000+ positive ratings
- Ships from our own indoor warehouse
Specifications
| Fits Vehicle Model | A6, S6 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4B3-819-373-B (4B3819373B) |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 7 vehicle configurations across 1 make, 2000-2004.
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.
View all 7 vehicle configurations
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2000 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2001 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2002 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2002 | Audi | S6 | Wagon | 4.2L V8 | |
| 2003 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2003 | Audi | S6 | Wagon | 4.2L V8 | |
| 2004 | Audi | A6 | Quattro Sedan | 4.2L V8 |