Genuine Volkswagen Jetta Radiator Cap

Cooling Radiator Cap

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5 Radiator Caps found

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Volkswagen Jetta 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; Cap, Reservoir Cap
- Replaces: 3C0-121-321
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2014-2018, 2009 Volkswagen Jetta | 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
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Volkswagen Jetta 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
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 1985-1999 Volkswagen Jetta | 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
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Volkswagen Jetta Cap Part Number: 1J0-121-422
$3.46 MSRP: $5.68
You Save: $2.22 (40%)
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Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 1999-2005 Volkswagen Jetta | 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 Jetta Cap Part Number: 3B0-121-321
$24.14 MSRP: $39.59
You Save: $15.45 (40%)
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Product Specifications
- Other Name: Cover; Cap, Expansion Tank
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 1999-2018 Volkswagen Jetta | 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
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Volkswagen Jetta Cap Part Number: 1H0-121-422
$6.98 MSRP: $11.44
You Save: $4.46 (39%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cover, Reservoir Bolt
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 1993-1999 Volkswagen Jetta | 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

Volkswagen Jetta Radiator Cap

The Radiator Cap on the Volkswagen Jetta is a device that maintains the appropriate amount of pressure on the coolant, which allows the engine of the small sedan to operate cooler and more efficiently in traffic and during fast drives. This Radiator Cap, which is small but essential, closes the top of the radiator at approximately sixteen psi, increasing the antifreeze boiling point to keep the engine liquid calm as the cylinders produce heat in a conflagration. A valve is attached to a calibrated spring that keeps it closed until pressure reaches its maximum, which forces the extra fluid into the overflow bottle and subsequently pulls it back as the system cools down, avoiding air bubbles that could cause sudden temperature surges. That cycle increases fuel efficiency as well as safety since a consistent thermal range implies that the engine burns fuel in an identical manner and prevents harmful steam. Compatibility extends to seven generations of the legendary Jetta model, between the early single-valve caps and the new dual-valve model that has a separate vacuum feature. The new design enables faster refilling, protects hoses against collapsing due to negative pressure and increases the life of the gasket, offering owners an easy upgrade without changing factory fittings. Drivers laud the durability of the cap, and they mention that the screw-on material is quite robust and does not corrode despite years of salted roads during winter. In case the part becomes worn as the symptoms of overheating or coolant spillage manifest, they appear quickly and remind the user that the reliability of the cap is protecting the overall cooling system. Since Volkswagen never had to undergo radical redesigns, the long service record of the cap can be taken as an impressive statement about its performance history. Exceptional two-way pressure regulation, wide model fit, and rock-solid construction are just a few reasons why this Radiator Cap can shine in a vast market of parts and keep Jetta journeys smooth, confident, and affordable.

Choose OEM Radiator Cap for superior quality and long-lasting durability. They match the Volkswagen's factory specifications exactly and pass strict quality control. If you plan to replace Radiator Cap on your Jetta, put OEM at the top of your list. You'll get the right fit, reliable performance, and peace of mind. We stock an extensive inventory of genuine Volkswagen Jetta parts. It is easy to find what you need. You will love our competitive prices that help you save. No more hassle with returns or guesswork. Every part includes a warranty straight from the manufacturer. Get trusted quality, strong durability, and real value today.