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OE Quality
60-Day Returns
Dorman 902-991 Engine Coolant Thermostat Housing - Engine Block
| Brand | Dorman 902-991 |
|---|---|
| Position | Engine Block |
| Air Vent (Bleeder Valve) | No |
| Bolts Included | No |
| Color | Black |
| Gasket Or Seal Included | Yes |
| Housing Neck Angle (┬░) | 45 Degrees From Base |
| Material | Plastic |
| Mounting Hole Diameter | 0.313 |
| Mounting Hole Quantity | 2 |
| O Rings Included | Yes |
| Package Contents | Water Outlet; O-ring |
| Thermostat Included | No |
| Fits | Audi and Volkswagen · 54 vehicles |
OE-style replacement. Matches stock fit and durability for a straightforward swap.
Plastic housing. Lightweight construction with a black finish.
Seal included. Comes with a gasket and O-ring for a tighter install.
Cross-references Beck/Arnley 147-0043, Four Seasons 85134 and Gates CO34810 for the same application. See all 10.
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Not what you need? See all Engine Coolant Thermostat Housing options
Engine Coolant Thermostat Housing
Dorman 902-991 is a replacement engine coolant thermostat housing for select Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, and Volkswagen Passat applications. It is built to match the stock housing’s fit and durability, with a plastic construction that is made to handle repeated temperature swings in the cooling system.
For drivers searching for an Audi A4 thermostat housing or Volkswagen Passat coolant outlet replacement, this housing provides the correct mounting layout and sealing components for the listed engine-block applications. Dorman 902-991 is also a direct-fit option for several diesel and gasoline engine configurations across 1997-2008 model years.
- Plastic housing in black finish
- Gasket or seal included
- O-ring included
- 2 mounting holes with 0.313 in. diameter
- 45-degree neck angle from base
- No thermostat included
- No bleeder valve
- No bolts included
Fitment Details
- Fits 2005-2008 Audi A4, engine block, cover; L4 120CID 2.0L (1968cc)
- Fits 2001-2008 Audi A4, engine block, cover; L4 116CID 1.9L (1896cc)
- Fits 2007-2008 Audi A4, engine block, cover; engine desg. BPW; L4 121CID 2.0L (1984cc)
- Fits 2005-2008 Audi A4 Quattro, engine block, cover; L4 120CID 2.0L (1968cc); diesel
- Fits 2000-2008 Audi A4 Quattro, engine block, cover; L4 116CID 1.9L (1896cc)
- Fits 2006 Audi A4, engine block, cover; engine desg. BPW
- Fits 2002-2005 Audi A6, engine block, cover; L4 116CID 1.9L (1896cc); diesel
- Fits 2003-2005 Audi A6, engine block, cover; L4 1.8L (1781cc)
- Fits 2003-2005 Audi A6 Quattro, engine block, cover; L4 1.8L (1781cc)
- Fits 2000-2005 Volkswagen Passat, engine block
- Fits 2001 Audi A4, engine block, 8th Digit of VIN is D; cover
- Fits 2001 Audi A4 Quattro, engine block, 8th Digit of VIN is D; cover
- Fits 2000 Volkswagen Passat, engine block, cover; L4 1.9L
- Fits 1999-2000 Volkswagen Passat, engine block, cover; L4 1.6L (1595cc)
- Fits 1998-1999 Audi A4, engine block, cover; L4 1.6L (1595cc)
- Fits 1997 Audi A4, engine block, cover; engine desg. AHL; L4 1.6L (1595cc)
What It Helps Fix
- Coolant leaks at the thermostat housing
- Cracked or warped plastic housing surfaces
- Sealing issues at the water outlet connection
- Cooling system service on worn OE-style housings
- Fitment problems from damaged mounting points
Installation Notes
Verify engine code, VIN notes, and housing orientation before installation. This housing uses a 45-degree neck angle from the base, includes an O-ring and gasket or seal, and does not include the thermostat or bolts. Confirm the cooling system is drained and the mating surfaces are clean before assembly.
Quality Assurance
Dorman designs this thermostat housing as a direct replacement for the original part on the listed vehicles. Part number 902-991 is engineered to match OE fit and withstand extreme temperature changes for extended service life. This part cross-references Beck/Arnley 147-0043 and Gates CO34810 for the same application.
This part fits 54 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2008 | Audi | A4 | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc) |
| 2008 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2008 | Audi | A4 | — | — | — | Engine Block | Cover; Engine Desg. BPW; L4 121CID 2.0L (1984cc) |
| 2008 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc); DIESEL |
| 2008 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2007 | Audi | A4 | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc) |
| 2007 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2007 | Audi | A4 | — | — | — | Engine Block | Cover; Engine Desg. BPW; L4 121CID 2.0L (1984cc) |
| 2007 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc); DIESEL |
| 2007 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2006 | Audi | A4 | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc) |
| 2006 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2006 | Audi | A4 | 2.0L | L4 | — | Engine Block | Cover; Engine Desg. BPW |
| 2006 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc); DIESEL |
| 2006 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2005 | Audi | A4 | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc) |
| 2005 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2005 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 120CID 2.0L (1968cc); DIESEL |
| 2005 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2005 | Audi | A6 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc); DIESEL |
| 2005 | Audi | A6 | — | — | — | Engine Block | Cover; L4 1.8L (1781cc) |
| 2005 | Audi | A6 Quattro | — | — | — | Engine Block | Cover; L4 1.8L (1781cc) |
| 2005 | Volkswagen | Passat | 2.0L | L4 | DIESEL | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2005 | Volkswagen | Passat | 1.8L | L4 | — | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2004 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2004 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2004 | Audi | A6 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc); DIESEL |
| 2004 | Audi | A6 | — | — | — | Engine Block | Cover; L4 1.8L (1781cc) |
| 2004 | Audi | A6 Quattro | — | — | — | Engine Block | Cover; L4 1.8L (1781cc) |
| 2004 | Volkswagen | Passat | 2.0L | L4 | DIESEL | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2004 | Volkswagen | Passat | 1.8L | L4 | — | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2003 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2003 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2003 | Audi | A6 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc); DIESEL |
| 2003 | Audi | A6 | — | — | — | Engine Block | Cover; L4 1.8L (1781cc) |
| 2003 | Audi | A6 Quattro | — | — | — | Engine Block | Cover; L4 1.8L (1781cc) |
| 2003 | Volkswagen | Passat | 1.8L | L4 | — | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2002 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2002 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2002 | Audi | A6 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc); DIESEL |
| 2002 | Volkswagen | Passat | 1.8L | L4 | — | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2001 | Audi | A4 | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2001 | Audi | A4 | 1.8L | L4 | — | Engine Block | 8th Digit of VIN is D; Cover |
| 2001 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2001 | Audi | A4 Quattro | 1.8L | L4 | — | Engine Block | 8th Digit of VIN is D; Cover |
| 2001 | Volkswagen | Passat | 1.8L | L4 | — | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2000 | Audi | A4 Quattro | — | — | — | Engine Block | Cover; L4 116CID 1.9L (1896cc) |
| 2000 | Volkswagen | Passat | — | — | — | Engine Block | Cover; L4 1.9L |
| 2000 | Volkswagen | Passat | 1.8L | L4 | — | Engine Block | Engine coolant thermostat housing for cooling system. |
| 2000 | Volkswagen | Passat | — | — | — | Engine Block | Cover; L4 1.6L (1595cc) |
| 1999 | Audi | A4 | — | — | — | Engine Block | Cover; L4 1.6L (1595cc) |
| 1999 | Volkswagen | Passat | — | — | — | Engine Block | Cover; L4 1.6L (1595cc) |
| 1998 | Audi | A4 | — | — | — | Engine Block | Cover; L4 1.6L (1595cc) |
| 1997 | Audi | A4 | — | — | — | Engine Block | Cover; Engine Desg. AHL; L4 1.6L (1595cc) |
| No rows match your filter. | |||||||
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Beck/Arnley — 147-0043Four Seasons — 85134Gates — CO34810Motorad — CH9991OSC — 1221121815505038121121BKGT-1121-NTV122