Genuine Volkswagen Coolant Reservoir Cap

Coolant Overflow Reservoir Cap

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17 Coolant Reservoir Caps found

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Volkswagen Cap Part Number: 171-121-321-J
$25.09 MSRP: $41.83
You Save: $16.74 (41%)
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Product Specifications
- Other Name: Cover
Fits the following Volkswagen Models:
- Fox | 1987-1993 | Base, GL, GL Sport | 4 Cyl 1.8 L GAS
- Golf | 1985-1992 | Base, GL, GT, GTI, GTI 16-Valve, GTI 8-Valve | 4 Cyl 1.6 L DIESEL, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Volkswagen Cap Part Number: 1H0-121-321-C
$32.75 MSRP: $54.58
You Save: $21.83 (40%)
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Product Specifications
- Other Name: Cover; Radiator Cap, Reservoir Cap, Reservoir Cover
- Replaces: 1H0-121-321-A, 357-121-321-C
Fits the following Volkswagen Models:
- Cabrio | 1995-2002 | Base, GL, GLS, GLX, High Line | 4 Cyl 2.0 L GAS
- Corrado | 1990-1994 | G60, SLC | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- EuroVan | 1999-2003, 1997, 1995, 1993 | Base, CL, Camper, GL, GLS, MV, Transport | 5 Cyl 2.4 L DIESEL, 5 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS
- Golf | 1990-1999 | Celebration Edition, City, GL, GTI, GTI 16-Valve, GTI 8-Valve, GTI VR6, Jazz, K2, Limited Edition, Sport, Trek, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Jetta | 1985-1999 | Base, Carat, Celebration Edition, City, GL, GLI, GLI 16-Valve, GLS, GLX, GT, Jazz, K2, Limited Edition, TDI, Trek, Wolfsburg Edition | 4 Cyl 1.6 L DIESEL, 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Passat | 1990-1997 | CL, GL, GLS, GLX, TDI | 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Cap Part Number: 1C9-121-321
$39.95 MSRP: $55.48
You Save: $15.53 (28%)
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Product Specifications
- Other Name: Cover; Reservoir Cap
Fits the following Volkswagen Models:
- Passat | 2002-2004 | W8 | 8 Cyl 4.0 L GAS
- Touareg | 2006-2009, 2004 | Base, TDI | 10 Cyl 4.9 L DIESEL, 10 Cyl 5.0 L DIESEL, 8 Cyl 4.2 L GAS
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Volkswagen Radiator Cap Part Number: 7B0-121-321-A
$16.69 MSRP: $22.80
You Save: $6.11 (27%)
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Product Specifications
- Other Name: Cover
- Replaces: 7B0-121-321
Fits the following Volkswagen Models:
- Routan | 2009-2014 | S, SE, SEL, SEL Premium | 6 Cyl 3.6 L FLEX, 6 Cyl 3.8 L GAS, 6 Cyl 4.0 L GAS
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Volkswagen Cap Part Number: 3B0-121-321
$22.68 MSRP: $37.18
You Save: $14.50 (39%)
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Product Specifications
- Other Name: Cover; Expansion Tank, Reservoir Cap
Fits the following Volkswagen Models:
- Beetle | 2012-2017, 1998-2010 | #PinkBeetle, 2.5, Base, Classic, Denim, Dune, Fleet Edition, GL, GLS, GLS TDI, GLX, GSR, R-Line, R-Line S, R-Line SE, R-Line SEL, S, SE, SEL, Sport, TDI, Turbo, Turbo S, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS
- CC | 2009-2017 | Executive, Lux, Lux Limited, Lux Plus, Luxury, R-Line, R-Line Executive, Sport, Sport Plus, Trend | 4 Cyl 2.0 L GAS
- Eos | 2007-2016 | 2.0T, 3.2, Base, Executive, Final Edition, Komfort, Lux, Sport, Turbo, VR6 | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- Golf | 2010-2014, 1999-2006 | Base, GL, GL TDI, GLS, GLS TDI, GTI, GTI 1.8T, GTI 20th Anniversary, GTI 337, GTI GLS, GTI GLX, GTI VR6, TDI | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS
- Golf R | 2012-2013 | Base | 4 Cyl 2.0 L GAS
- GTI | 2006-2014 | Base, Driver's Edition, Fahrenheit, Wolfsburg Edition | 4 Cyl 2.0 L GAS
- Jetta | 1999-2018 | 2.0T, 2.5, Base, GL, GL TDI, GLI, GLI SE, GLI SEL, GLS, GLS TDI, GLX, Hybrid, Hybrid SE, Hybrid SEL, Hybrid SEL Premium, S, SE, SE Sport, SEL, SEL Premium, Sport, TDI, TDI Cup Edition, TDI Premium, TDI S, TDI SE, TDI SEL, Value Edition, Wolfsburg Edition | 4 Cyl 1.4 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS
- Passat | 2012-2019, 1998-2010 | 2.0T, 4 Motion, GL, GL TDI, GLS, GLS 4 Motion, GLS TDI, GLX, GLX 4 Motion, GT, Komfort, Limited Edition, Lux, R-Line, S, SE, SE R-Line, SEL, SEL Premium, Sport, TDI SE, TDI SEL, TDI SEL Premium, Turbo, Value Edition, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.6 L GAS
- R32 | 2008 | Base | 6 Cyl 3.2 L GAS
- Rabbit | 2006-2009 | 2.5, S | 5 Cyl 2.5 L GAS
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Volkswagen Cap Part Number: 5Q0-121-321
$34.80 MSRP: $58.00
You Save: $23.20 (40%)
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Product Specifications
- Other Name: Cover; Reservoir Cap
Fits the following Volkswagen Models:
- Beetle | 2014-2017 | GSR, R-Line, R-Line S, R-Line SE, R-Line SEL, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- CC | 2009-2016 | 4 Motion, Executive, Executive 4 Motion, Lux, V6 Executive 4Motion, VR6, VR6 4Motion, VR6 4Motion Executive, VR6 Sport | 6 Cyl 3.6 L GAS
- e-Golf | 2015-2019 | Limited Edition, SE, SEL Premium | BATTERY EV (EV/BEV)
- Golf | 2015-2018 | Base, Launch Edition, S, SE, SEL, TDI S, TDI SE, TDI SEL, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL
- Golf Alltrack | 2017-2019 | S, SE, SEL | 4 Cyl 1.8 L GAS
- Golf R | 2015-2019 | Base | 4 Cyl 2.0 L GAS
- Golf SportWagen | 2015-2019 | Limited Edition, S, SE, SEL, TDI S, TDI SE, TDI SEL | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL
- GTI | 2015-2017 | Autobahn, S, SE, Sport | 4 Cyl 2.0 L GAS
- Jetta | 2014-2018, 2009 | GLI, GLI SE, GLI SEL, Hybrid SEL Premium, S, SE, TDI, Wolfsburg Edition | 4 Cyl 1.4 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 1.4 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- Passat | 2012-2018, 2006-2008 | 3.6, GT, SE, SEL Premium, VR6 | 6 Cyl 3.6 L GAS
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Volkswagen Cap Part Number: 2Q0-121-321-A
$25.79 MSRP: $42.98
You Save: $17.19 (40%)
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Product Specifications
- Other Name: Cover; Reservoir Cap
- Replaces: 2Q0-121-321, 3C0-121-321
Fits the following Volkswagen Models:
- Arteon | 2019-2023 | SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line | 4 Cyl 2.0 L GAS
- Atlas | 2018-2025 | Launch Edition, Peak Edition SE, Peak Edition SEL, S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- Atlas Cross Sport | 2020-2025 | S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black, Trendline | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- Beetle | 2017-2019 | Coast, Dune, Final Edition SE, Final Edition SEL, R-Line SEL, S, SE | 4 Cyl 2.0 L GAS
- Golf | 2018-2021 | S, SE, TSi | 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS
- Golf Alltrack | 2018-2019 | S, SE, SEL | 4 Cyl 1.8 L GAS
- Golf R | 2022-2025, 2018-2019 | 20th Anniversary Edition, Base | 4 Cyl 2.0 L GAS
- Golf SportWagen | 2018-2019 | S, SE, SEL | 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS
- GTI | 2018-2025 | 40th Anniversary Edition, Autobahn, Rabbit Edition, S, SE | 4 Cyl 2.0 L GAS
- ID. Buzz | 2025 | 1st Edition, Pro S, Pro S Plus | BATTERY EV (EV/BEV)
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Volkswagen Reservoir Cap Part Number: 3D0-121-321-B
$34.55 MSRP: $57.58
You Save: $23.03 (40%)
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Product Specifications
- Other Name: Cover
- Replaces: 3D0-121-321
Fits the following Volkswagen Models:
- Phaeton | 2004-2006 | V8, W12 | 12 Cyl 6.0 L GAS, 8 Cyl 4.2 L GAS
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Volkswagen Cap Part Number: 1J0-121-422
$3.46 MSRP: $5.68
You Save: $2.22 (40%)
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Product Specifications
- Other Name: Reservoir Cap
Fits the following Volkswagen Models:
- Golf | 1999-2006 | GL, GL TDI, GLS, GLS TDI, GTI, GTI 1.8T, GTI 20th Anniversary, GTI 337, GTI GLS, GTI GLX, GTI VR6, TDI | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Jetta | 1999-2005 | GL, GL TDI, GLI, GLS, GLS TDI, GLX, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Reservoir Cap Part Number: 1H0-121-422-D
$4.40 MSRP: $7.22
You Save: $2.82 (40%)
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Product Specifications
- Other Name: Cap
- Replaces: 1H0-121-422-C
Fits the following Volkswagen Models:
- Cabrio | 1999-2002 | Base, GL, GLS, GLX | 4 Cyl 2.0 L GAS
- Golf | 1998-1999 | GL, GTI, K2, Wolfsburg Edition | 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Cap Part Number: 1J0-121-321-B
$24.14 MSRP: $39.59
You Save: $15.45 (40%)
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Product Specifications
- Other Name: Cover; Reservoir Cap
Fits the following Volkswagen Models:
- Touareg | 2007-2010 | Base, TDI, VR6 | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.6 L GAS
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Volkswagen Reservoir Cap Part Number: 1C0-121-422
$4.03 MSRP: $6.60
You Save: $2.57 (39%)
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Product Specifications
- Other Name: Cap; Reservoir Cover
Fits the following Volkswagen Models:
- Beetle | 1998-2005 | Base, GL, GLS, GLS TDI, GLX, Sport, TDI, Turbo S | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Cap Part Number: 1H0-121-422
$6.98 MSRP: $11.44
You Save: $4.46 (39%)
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Product Specifications
- Other Name: Cover, Reservoir Bolt, Reservoir Cap
Fits the following Volkswagen Models:
- Corrado | 1992-1994 | SLC | 6 Cyl 2.8 L GAS
- Golf | 1993-1998 | Celebration Edition, City, GL, GTI, GTI VR6, Jazz, K2, Limited Edition, Sport, Trek | 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Jetta | 1993-1999 | Celebration Edition, City, GL, GLS, GLX, GT, Jazz, K2, Limited Edition, TDI, Trek, Wolfsburg Edition | 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Passat | 1995-1997 | GLX | 6 Cyl 2.8 L GAS
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Volkswagen Cap Part Number: 443-121-321
$56.99 MSRP: $79.15
You Save: $22.16 (28%)
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Product Specifications
- Other Name: Cover; Expansion Tank Cap
Fits the following Volkswagen Models:
- Cabriolet | 1985-1993 | Base, Bestseller, Boutique, Carat, Classic, Etienne Aigner, Wolfsburg Edition | 4 Cyl 1.8 L GAS
- Golf | 1985-1989 | Base, GL, GT, GTI, GTI 16-Valve | 4 Cyl 1.6 L DIESEL, 4 Cyl 1.8 L GAS
- Scirocco | 1985-1988 | 16-Valve, Base | 4 Cyl 1.8 L GAS
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Volkswagen Reservoir Cap Part Number: 025-121-482
$7.02 MSRP: $11.50
You Save: $4.48 (39%)
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Product Specifications
- Other Name: Cover
Fits the following Volkswagen Models:
- Vanagon | 1984-1991 | Base, Campmobile, Carat, GL, L, Syncro | 4 Cyl 1.9 L GAS, 4 Cyl 2.1 L GAS
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Volkswagen Cap Part Number: 7B0-121-323-B
$35.87 MSRP: $49.82
You Save: $13.95 (28%)
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Product Specifications
- Other Name: Reservoir Cap
- Replaces: 7B0-121-323-A, 7B0-121-323
Fits the following Volkswagen Models:
- Routan | 2009-2014 | S, SE, SEL, SEL Premium | 6 Cyl 3.6 L FLEX, 6 Cyl 3.8 L GAS, 6 Cyl 4.0 L GAS
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Volkswagen Reservoir Cap Part Number: 025-121-321-B
$51.11 MSRP: $70.98
You Save: $19.87 (28%)
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Product Specifications
- Other Name: Cover
Fits the following Volkswagen Models:
- Vanagon | 1984-1991 | Base, Campmobile, Carat, GL, L, Syncro | 4 Cyl 1.9 L GAS, 4 Cyl 2.1 L GAS

Volkswagen Coolant Reservoir Cap

The VW Coolant Reservoir Cap provides a leak-proof seal on the coolant tank that locks temperature control fluid inside the system while stopping dirt or air from sneaking in. This ensures the engine remains at an optimum temperature during long drives. The brand started life as the original people car idea in 1937. It has now become a global name optimally known for the Beetle, the Type 2 van, and an extensive array of modern-day sedans, SUVs, and electric cars that mix clever tech with clean design. The company employs TSI turbo engines that make use of direct injection for strong performance with good fuel efficiency. It uses a highly flexible MQB platform that maintains a high quality of body build and adds digital cockpit screens, park assist, and MIB infotainment that make every drive simpler. As Volkswagen develops its ID electric line, the same engineering, safety, and fun that drivers rely on will be maintained. The Coolant Reservoir Cap has a straightforward function but a crucial role. Quite simply, its threaded shell and a firm gasket put a tight press against the draining reservoir opening. As a result, when the coolant expands, it allows the pressure to flow into the overflow tank. Then, as the engine cools off, it pulls the liquid back to prevent the overflowing tank from becoming limp. Therefore, it will keep the volume steady. The cap helps restrict oxygen that might create rust inside passages. It helps avoid the leak of toxic fluid and promotes the overall engine health of the VW lineup.

Buying OEM parts is a smart move to keep your long-term repair costs low. These components are built to last because VW uses such strict factory standards. At VWPartsGiant.com, it is easy to find genuine Volkswagen Coolant Reservoir Cap at prices that actually beat the competition. You get a real manufacturer's warranty with every single part, so you know your purchase is safe. Plus, forget about return headaches since our policy is easy and worry-free. We ship your order fast, too. If you have questions, our team of parts experts is ready to help. Why wait? Start shopping now!