1998-2005 Audi Heater Blower Motor / Fan Resistor 4B0820521
OEM Part #: 4B0-820-521 (4B0820521)
Actual photo
The exact part you’ll receive — not a stock photo.
$6.68
Used
Donor2001 Audi A6 · 2.8L
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Genuine OEM Used
SKU: 615186
Donor Vehicle: 2001 Audi A6 · 2.8L
2 photos
$6.68
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Genuine OEM Used
SKU: 135021
Donor Vehicle: None Audi Multi Qty
2 photos
$6.68
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Genuine OEM Used
SKU: 478086
Donor Vehicle: 2004 Audi ALLROAD · 2.7L
2 photos
$6.68
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Used Audi Heater Blower Motor / Fan Resistor, OEM part number 4B0820521. This genuine used part from a donor vehicle controls the speed of your HVAC blower fan. When this resistor fails, you may experience the fan only working on its highest setting or losing certain speed positions entirely. It's a direct replacement for the original component in your Audi's climate control system.
A bad resister can leave you with only 1 or no fan speed settings. If you blower motor doesn't work you will want to try this part first.
Specifications
| Fits Vehicle Model | A6, Allroad, RS6, S6 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4B0-820-521 (4B0820521) |
| Category | HVAC / 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.
View all 40 vehicle configurations
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2003 | Audi | S6 | Wagon | 4.2L V8 | |
| 2004 | Audi | A6 | Quattro Sedan | 3.0L V6 | |
| 2003 | Audi | A6 | Quattro Sedan | 3.0L V6 | |
| 2003 | Audi | A6 | Quattro Wagon | 3.0L V6 | |
| 2002 | Audi | A6 | Sedan | 3.0L V6 | |
| 2004 | Audi | A6 | Sedan | 3.0L V6 | |
| 2004 | Audi | A6 | Quattro Wagon | 3.0L V6 | |
| 2003 | Audi | A6 | Sedan | 3.0L V6 | |
| 2005 | Audi | Allroad | Quattro Wagon | 2.7L V6 Turbo | |
| 2002 | Audi | A6 | Quattro Sedan | 3.0L V6 | |
| 2002 | Audi | A6 | Quattro Wagon | 3.0L V6 | |
| 2000 | Audi | A6 | Quattro Sedan | 2.7L V6 Turbo | |
| 2002 | Audi | Allroad | Quattro Wagon | 2.7L V6 Turbo | |
| 1998 | Audi | A6 | Sedan | 2.8L V6 | |
| 2003 | Audi | RS6 | Sedan | 4.2L V8 Turbo | |
| 2000 | Audi | A6 | Sedan | 2.8L V6 | |
| 2001 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 1998 | Audi | A6 | Quattro Sedan | 2.8L V6 | |
| 2001 | Audi | Allroad | Quattro Wagon | 2.7L V6 Turbo | |
| 2003 | Audi | A6 | Quattro Sedan | 2.7L V6 Turbo | |
| 2000 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2003 | Audi | Allroad | Quattro Wagon | 2.7L V6 Turbo | |
| 2002 | Audi | S6 | Wagon | 4.2L V8 | |
| 2002 | Audi | A6 | Quattro Sedan | 2.7L V6 Turbo | |
| 2004 | Audi | A6 | Quattro Sedan | 2.7L V6 Turbo | |
| 2002 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2004 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2005 | Audi | Allroad | Quattro Wagon | 4.2L V8 | |
| 2000 | Audi | A6 | Quattro Wagon | 2.8L V6 | |
| 2003 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 1999 | Audi | A6 | Sedan | 2.8L V6 | |
| 1999 | Audi | A6 | Quattro Wagon | 2.8L V6 | |
| 2001 | Audi | A6 | Quattro Wagon | 2.8L V6 | |
| 2000 | Audi | A6 | Quattro Sedan | 2.8L V6 | |
| 2001 | Audi | A6 | Quattro Sedan | 2.8L V6 | |
| 2004 | Audi | Allroad | Quattro Wagon | 4.2L V8 | |
| 1999 | Audi | A6 | Quattro Sedan | 2.8L V6 | |
| 2001 | Audi | A6 | Sedan | 2.8L V6 | |
| 2001 | Audi | A6 | Quattro Sedan | 2.7L V6 Turbo | |
| 2004 | Audi | Allroad | Quattro Wagon | 2.7L V6 Turbo |