United States
Product overview
Genuine OEM Volkswagen Coolant Expansion Tank Cap, part number 3D0121321B. This cap is designed to seal the coolant expansion tank, maintaining the correct pressure within the cooling system and preventing coolant evaporation or leakage. It is a critical component for regulating cooling system pressure. The cap is made of durable blue plastic and measures approximately 80mm in diameter. Using a genuine OEM cap ensures the correct pressure relief valve calibration and material resistance to high temperatures and corrosive coolants, vital for engine cooling efficiency and safety.
Technical details
- Category
- Engine Cooling
- Country of origin
- Austria
- Customs (HS) code
- 87089997
- Manufacturer
- Volkswagen
- Product Type
- Genuine new auto parts
- Shipping size (L × W × H)
- 8 × 8 × 4 cm
- Shipping weight
- 0.07 kg
Why buy from WW Spares?
- ✓ Genuine OEM inventory sourced directly from factory networks
- ✓ Fitment support from workshop-seasoned parts specialists
- ✓ Global logistics with customs-ready documentation
Need help confirming compatibility? Talk to a specialist
Parts diagram & fitment
4 vehiclesEnd Cap — locate 3D0121321B Volkswagen Coolant Expansion Tank Cap | Genuine OEM in the official exploded view and explore the surrounding assembly.
Superseded by 3D0121407H — the current replacement part.
Parts in this assembly14
Compatible / alternative parts(1)
Vehicle fitment table4
Europe (4)
| Vehicle | Years | Pos. | Qty | PR |
|---|---|---|---|---|
| phaeton 4motion | 2010-2016 | 21 | 1 | |
| phaeton 4motion | 2008-2010 | 21 | 1 | TA0 |
| PHAETON 08> | 2007- | 21 | 1 | |
| Phaeton (lang) | 2003-2006 | 21 | 1 |
Diagrams & fitment data powered by oemdiagrams.com
3D0121321B Volkswagen Coolant Expansion Tank Cap | Genuine OEM is fitted on: phaeton 4motion 2010-2016; phaeton 4motion 2008-2010; PHAETON 08> 2007-; Phaeton (lang) 2003-2006.
