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DormanPart #: 54016
Dorman 54016 Engine Coolant Reservoir Cap
102 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Audi and Volkswagen, Q7, Touareg, A3, A3 Quattro, Allroad Quattro, Jetta, Passat, A6 Quattro, RS6, S6, Golf, S3, A4, A4 Quattro, RS4, S4, TT, TT Quattro, and A6
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Not what you need? See all Engine Coolant Reservoir Cap options
Engine Coolant Reservoir Cap Replacement
Replace a cracked or missing coolant reservoir cap with a direct-fit Dorman solution built for a threaded-on twist design. Dorman 54016 is a plastic cap with a 2.45-inch diameter and a 22 PSI pressure rating, made to restore proper sealing at the coolant reservoir.
Key Features
- Direct replacement engine coolant reservoir cap
- Twist-on, threaded attachment for secure fitment
- Plastic construction with blue finish
- 22 PSI maximum pressure rating
- Non-vented, non-pressurized design
- Dimensions: 2.45-inch diameter, 3.17-inch length, 1.5-inch width
Detailed Description
Dorman 54016 is engineered as a precise replacement for the original coolant reservoir cap when the factory part is cracked, lost, or no longer sealing correctly. This cap helps maintain the reservoir’s closed system by threading on securely and holding the specified pressure rating. It is a practical replacement for Audi Q7, Audi A3, Volkswagen Touareg, Volkswagen Jetta, and other listed applications where the correct cap style and pressure specification matter. This part cross-references URO 1J0121321B for the same application.
Vehicle Fitment
- Fits 2007-2018 Audi Q7, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2004-2010 Volkswagen Touareg, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1998-2005 Audi A3, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2004-2005 Audi A3 Quattro, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2001-2005 Audi Allroad Quattro, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2001-2005 Volkswagen Jetta, N/A. Notes: L4 1.4L (1390cc); Packaging Type: Box
- Fits 2001-2005 Volkswagen Jetta, N/A. Notes: L4 97CID 1.6L (1588cc); Packaging Type: Box
- Fits 1998-2005 Volkswagen Passat, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1999-2004 Audi A6 Quattro, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2003-2004 Audi RS6, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2001-2004 Audi S6, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2004 Volkswagen Golf, N/A. Notes: To VIN 1J-54000 002; Packaging Type: Box
- Fits 2000-2003 Audi S3, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1999-2003 Volkswagen Golf, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2002 Audi A4, N/A. Notes: To VIN 8D-2-010 000; Packaging Type: Box
- Fits 2002 Audi A4 Quattro, N/A. Notes: To VIN 8D-2-010 000; Packaging Type: Box
- Fits 2002 Audi RS4, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2000-2002 Audi S4, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1999-2002 Audi TT, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 2000-2002 Audi TT Quattro, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1997-2001 Audi A4, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1997-2001 Audi A4 Quattro, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1999-2001 Audi A6, N/A. Notes: Fits washer fluid reservoir cap on automatic transmission vehicles.
- Fits 1998 Audi A6, N/A. Notes: From VIN 4B-W-000 001; Packaging Type: Box
- Fits 1998 Audi A6 Quattro, N/A. Notes: From VIN 4B-W-000 001; Packaging Type: Box
Common Problems This Part Can Solve
- Coolant reservoir cap is cracked or broken
- Cap is missing and the reservoir will not seal
- Pressure loss at the coolant reservoir
- Coolant odor or seepage around the reservoir opening
- Improper cap fit after a failed replacement
Installation Notes and Tips
Confirm the reservoir opening, thread style, and pressure rating before installation. Clean the sealing surface on the coolant reservoir, then thread the cap on by hand until fully seated. Verify that the cap matches the vehicle application notes, especially on Audi and Volkswagen models with VIN-specific or automatic-transmission-related fitment details.
Quality Assurance
Dorman 54016 is built as a direct replacement part with application-specific dimensions and pressure specification. It is intended to restore the original cap function on listed Audi and Volkswagen vehicles, including Audi A4, Audi A6, Audi TT, and Volkswagen Golf and Jetta applications.
| Brand | Dorman |
|---|---|
| Part Number | 54016 |
| Attachment Type | Threaded On |
| Color | Blue |
| Diameter | 2.45 |
| Length (In) | 3.17 in |
| Material | Plastic |
| Maximum Pressure Rating | 22 |
| Package Contents | 1 Coolant Cap |
| Pressure Release Lever | No |
| Pressurized | No |
| Type | Twist |
| Vented | No |
| Width (in) | 1.5 in |
This part fits 102 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2018 | Audi | Q7 | 3.0L | V6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
| 2017 | Audi | Q7 | 3.0L | V6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
| 2016 | Audi | Q7 | 3.0L | V6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
| 2015 | Audi | Q7 | 3.0L | V6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
| 2014 | Audi | Q7 | 3.0L | V6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
| 2013 | Audi | Q7 | 3.0L | V6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
| 2012 | Audi | Q7 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2011 | Audi | Q7 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2010 | Audi | Q7 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2010 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2009 | Audi | Q7 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2009 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2008 | Audi | Q7 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2008 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2007 | Audi | Q7 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2007 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2006 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2005 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2005 | Audi | A3 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2005 | Audi | Allroad Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2005 | Volkswagen | Jetta | N/A | L4 1.4L (1390cc); Packaging Type: Box | ||
| 2005 | Volkswagen | Jetta | N/A | L4 97CID 1.6L (1588cc); Packaging Type: Box | ||
| 2005 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2005 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Audi | A3 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Audi | A6 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Audi | Allroad Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Audi | RS6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Audi | S6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Volkswagen | Golf | N/A | To VIN 1J-54000 002; Packaging Type: Box | ||
| 2004 | Volkswagen | Jetta | N/A | L4 1.4L (1390cc); Packaging Type: Box | ||
| 2004 | Volkswagen | Jetta | N/A | L4 97CID 1.6L (1588cc); Packaging Type: Box | ||
| 2004 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2004 | Volkswagen | Touareg | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Audi | A6 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Audi | Allroad Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Audi | RS6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Audi | S3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Audi | S6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Volkswagen | Golf | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2003 | Volkswagen | Jetta | N/A | L4 1.4L (1390cc); Packaging Type: Box | ||
| 2003 | Volkswagen | Jetta | N/A | L4 97CID 1.6L (1588cc); Packaging Type: Box | ||
| 2003 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | A4 | N/A | To VIN 8D-2-010 000; Packaging Type: Box | ||
| 2002 | Audi | A4 Quattro | N/A | To VIN 8D-2-010 000; Packaging Type: Box | ||
| 2002 | Audi | A6 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | Allroad Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | RS4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | S3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | S4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | S6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | TT | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Audi | TT Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Volkswagen | Golf | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2002 | Volkswagen | Jetta | N/A | L4 1.4L (1390cc); Packaging Type: Box | ||
| 2002 | Volkswagen | Jetta | N/A | L4 97CID 1.6L (1588cc); Packaging Type: Box | ||
| 2002 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | A4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | A4 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | A6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | A6 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | Allroad Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | S3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | S4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | S6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | TT | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Audi | TT Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Volkswagen | Golf | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2001 | Volkswagen | Jetta | N/A | L4 1.4L (1390cc); Packaging Type: Box | ||
| 2001 | Volkswagen | Jetta | N/A | L4 97CID 1.6L (1588cc); Packaging Type: Box | ||
| 2001 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | A4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | A4 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | A6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | A6 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | S3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | S4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | TT | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Audi | TT Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Volkswagen | Golf | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 2000 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Audi | A4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Audi | A4 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Audi | A6 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Audi | A6 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Audi | TT | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Volkswagen | Golf | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1999 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1998 | Audi | A3 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1998 | Audi | A4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1998 | Audi | A4 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1998 | Audi | A6 | N/A | From VIN 4B-W-000 001; Packaging Type: Box | ||
| 1998 | Audi | A6 Quattro | N/A | From VIN 4B-W-000 001; Packaging Type: Box | ||
| 1998 | Volkswagen | Passat | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1997 | Audi | A4 | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. | ||
| 1997 | Audi | A4 Quattro | N/A | Fits washer fluid reservoir cap on automatic transmission vehicles. |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
1J0121321B
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.