Expansion Tank Cap - 3B0121321
SKU code: 3B0121321
The coolant expansion tank cap maintains an elevated cooling system pressure to raise the boiling point of the liquid coolant, while venting excessive pressure to atmosphere. These caps have a limited service life; they should be pressure-tested as part of a routine maintenance schedule, and replaced as part of any major cooling system overhaul.
| Make | Model | Submodel | Engine |
|---|---|---|---|
| All | All | All | All |
| Audi | 8J TTRS | Quattro | 2.5T |
| Audi | 8V S3 | Quattro | 2.0T |
| Audi | A3 8P | FWD | 2.0T |
| Audi | A3 8P | FWD | TDI |
| Audi | A3 8P | Quattro | 2.0T |
| Audi | A3 8P | Quattro | 3.2L |
| Audi | A3 8P | Quattro | V6 3.2L |
| Audi | A3 8V | FWD | 1.4 e-tron |
| Audi | A3 8V | FWD | 1.8T |
| Audi | A3 8V | FWD | 2.0T |
| Audi | A3 8V | FWD | TDI |
| Audi | A3 8V | Quattro | 2.0T |
| Audi | A7 | C7 | 3.0T |
| Audi | B5 A4 | FWD | 1.8T |
| Audi | B5 A4 | FWD | V6 12v |
| Audi | B5 A4 | FWD | V6 30v |
| Audi | B5 A4 | Quattro | 1.8T |
| Audi | B5 A4 | Quattro | V6 12v |
| Audi | B5 A4 | Quattro | V6 30v |
| Audi | B5 S4 | All | 2.7T |
| Audi | B6 A4 | FWD | 1.8T |
| Audi | B6 A4 | FWD | V6 30v |
| Audi | B6 A4 | Quattro | 1.8T |
| Audi | B6 A4 | Quattro | V6 30v |
| Audi | B6 S4 | All | V8 |
| Audi | B7 A4 | FWD | 2.0T |
| Audi | B7 A4 | Quattro | 2.0T |
| Audi | B7 A4 | Quattro | V6 3.2L |
| Audi | B7 RS4 | All | V8 |
| Audi | B7 S4 | All | V8 |
| Audi | B8 A4 | FWD | 2.0T |
| Audi | B8 A4 | Quattro | 2.0T |
| Audi | B8 A4 | Quattro | V6 3.2L |
| Audi | B8 A4 | All | 2.0T |
| Audi | B8 A4 | All | V6 3.2L |
| Audi | B8 A5 | Quattro | 2.0T |
| Audi | B8 A5 | Quattro | V6 3.2L |
| Audi | B8 S4 | Quattro | 3.0T |
| Audi | B8 S5 | Quattro | 3.0T Cabriolet |
| Audi | B8 S5 | Quattro | 3.0T Coupe |
| Audi | B8 S5 | Quattro | V8 4.2L |
| Audi | B8 SQ5 | GTI | 3.0T |
| Audi | B8 SQ5 | Quattro | 3.0T |
| Audi | C5 A6 | Quattro | 2.7T |
| Audi | C5 A6 | Quattro | 4.2 |
| Audi | C5 A6 | FWD | V6 2.8L |
| Audi | C5 A6 | Quattro | V6 2.8L |
| Audi | C5 Allroad | Quattro | 2.7T |
| Audi | C5 Allroad | Quattro | 4.2L |
| Audi | C5 S6 | Quattro | 4.2 |
| Audi | C7 A6 | FWD | 2.0T |
| Audi | C7 A6 | FWD | V6 3.0T |
| Audi | C7 A6 | Quattro | 2.0T |
| Audi | C7 A6 | Quattro | 3.0 TDI |
| Audi | C7 A6 | Quattro | V6 3.0T |
| Audi | C7 S6 | Quattro | 4.0T |
| Audi | D4 A8 | Quattro | 3.0 TDI |
| Audi | D4 A8 | Quattro | 3.0T |
| Audi | D4 A8 | Quattro | 4.0T |
| Audi | Q5 | GTI | 3.0T |
| Audi | Q5 | Quattro | 2.0T |
| Audi | Q5 | Quattro | 3.0 TDI |
| Audi | Q5 | Quattro | 3.0T |
| Audi | Q5 | Quattro | 3.2L |
| Audi | Q5 | All | 2.0T |
| Audi | Q5 | All | 3.0T |
| Audi | Q5 | All | 3.2L |
| Audi | Q7 | GTI | 3.0T |
| Audi | Q7 | All | V6 |
| Audi | Q7 | All | V8 |
| Audi | RS6 | All | 4.2T |
| Audi | RS7 | Quattro | 4.0T |
| Audi | TT MKI | FWD | 180HP |
| Audi | TT MKI | Quattro | 180HP |
| Audi | TT MKI | Quattro | 225HP |
| Audi | TT MKI | Quattro | 3.2L |
| Audi | TT MKII | FWD | 2.0T |
| Audi | TT MKII | Quattro | 2.0T |
| Audi | TT MKII | Quattro | 3.2L |
| Audi | TT MKII | TTS | 2.0T |
| Audi | TTS | MK2 (2006-2013) | 2.0T |
| Volkswagen | 337/20AE | All | 1.8T |
| Volkswagen | Alltrack | All | 1.8T Gen3 |
| Volkswagen | Beetle | GTI | 1.8T Gen3 |
| Volkswagen | Beetle | GTI | 2.0T Gen3 |
| Volkswagen | Beetle | GTI | TDI |
| Volkswagen | CC | 4Motion | VR6 |
| Volkswagen | CC | FWD | 2.0T |
| Volkswagen | CC | FWD | VR6 |
| Volkswagen | EOS | All | 2.0T |
| Volkswagen | EOS | All | 3.2L |
| Volkswagen | Golf IV | All | 1.8T |
| Volkswagen | Golf IV | All | 2.0 |
| Volkswagen | Golf IV | All | TDI |
| Volkswagen | Golf IV | All | VR6 12v |
| Volkswagen | Golf IV | All | VR6 24v |
| Volkswagen | Golf R | All | 2.0T |
| Volkswagen | Golf V | All | 2.0T |
| Volkswagen | Golf V | All | 2.5 |
| Volkswagen | Golf V | All | TDI |
| Volkswagen | Golf VI | All | 2.0T |
| Volkswagen | Golf VI | All | 2.5 |
| Volkswagen | Golf VI | All | TDI |
| Volkswagen | Golf VII | Hatchback | 2.0T Gen3 |
| Volkswagen | Golf VII | Sportwagen | 1.8T Gen3 |
| Volkswagen | Golf VII | Sportwagen | TDI |
| Volkswagen | Golf VII R | 4Motion | 2.0T Gen3 |
| Volkswagen | Jetta IV | All | 1.8T |
| Volkswagen | Jetta IV | All | 16v |
| Volkswagen | Jetta IV | All | 2.0 |
| Volkswagen | Jetta IV | All | TDI |
| Volkswagen | Jetta IV | All | VR6 12v |
| Volkswagen | Jetta IV | All | VR6 24v |
| Volkswagen | Jetta IV | Wagon | All |
| Volkswagen | Jetta IV GLI | All | 1.8T |
| Volkswagen | Jetta V | All | 2.0T |
| Volkswagen | Jetta V | All | 2.5 |
| Volkswagen | Jetta V | All | TDI |
| Volkswagen | Jetta VI | Sedan | 1.4T Hybrid |
| Volkswagen | Jetta VI | Sedan | 1.8T Gen3 |
| Volkswagen | Jetta VI | Sedan | 2.0 |
| Volkswagen | Jetta VI | Sedan | 2.0T Gen3 GLI |
| Volkswagen | Jetta VI | Sedan | 2.5 |
| Volkswagen | Jetta VI | Sedan | GLI |
| Volkswagen | Jetta VI | Sedan | TDI |
| Volkswagen | Jetta VI | Sedan Facelift | 1.4T |
| Volkswagen | Jetta VI | Sedan Facelift | 1.4T Hybrid |
| Volkswagen | Jetta VI | Sedan Facelift | 1.8T Gen3 |
| Volkswagen | Jetta VI | Sedan Facelift | 2.0L |
| Volkswagen | Jetta VI | Sedan Facelift | 2.0T Gen3 GLI |
| Volkswagen | Jetta VI | Sedan Facelift | TDI |
| Volkswagen | Jetta VI | Sportwagen | 2.0T |
| Volkswagen | Jetta VI | Sportwagen | 2.5 |
| Volkswagen | Jetta VI | Sportwagen | TDI |
| Volkswagen | New Beetle | All | 1.8T |
| Volkswagen | New Beetle | All | 16v |
| Volkswagen | New Beetle | All | 2.0 |
| Volkswagen | New Beetle | All | 2.5L |
| Volkswagen | New Beetle | All | TDI |
| Volkswagen | Passat B5 | 4 Motion | 1.8T |
| Volkswagen | Passat B5 | 4 Motion | V6 30v |
| Volkswagen | Passat B5 | 4 Motion | W8 |
| Volkswagen | Passat B5 | FWD | 1.8T |
| Volkswagen | Passat B5 | FWD | TDI |
| Volkswagen | Passat B5 | FWD | V6 30v |
| Volkswagen | Passat B6 | 4 Motion | 3.6L |
| Volkswagen | Passat B6 | FWD | 2.0T |
| Volkswagen | Passat B6 | FWD | 3.6L |
| Volkswagen | Passat B7 | FWD | 1.8T Gen3 |
| Volkswagen | Passat B7 | FWD | 2.0T Gen3 |
| Volkswagen | R32 | All | All |
| Volkswagen | R32 MKIV | All | 3.2 |
| Volkswagen | R32 MKV | All | 3.2 |
| Volkswagen | Tiguan 1 | 4 Motion | 2.0T |
| Volkswagen | Tiguan 1 | FWD | 2.0T |
| Volkswagen | Tiguan 2 | 4 Motion | 2.0T |
| Volkswagen | Tiguan 2 | FWD | 2.0T |
| Volkswagen | Touareg 1 | All | TDI |
| Volkswagen | Touareg 1 | All | V6 |
| Volkswagen | Touareg 1 | All | V8 |
| Volkswagen | Touareg 2 | All | TDI |
| Volkswagen | Touareg 2 | All | V10 TDI |
| Volkswagen | Touareg 2 | All | V6 |
| Volkswagen | Touareg 2 | All | V6 TDI |
| Volkswagen | Touareg 2 | All | V8 |
| Volkswagen | Touareg 3 | Hybrid | All |
| SKU | 3B0121321 |
| Brand | Genuine Volkswagen/Audi |
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