Genuine Bentley Continental GT Flying Spur Coolant Expansion Tank 3W0121403D

Maintain the structural integrity of your cooling system with this Genuine Bentley Primary Expansion Tank. Part number 3W0121403D is the essential reservoir for Early-Production (2004-2006) Continental GT and Flying Spur vehicles.

Technical Specifications & Fitment:

• Part Number: 3W0121403D (Replaces 3W0121403, A, B, and C)

• Chassis Compatibility: Bentley Continental GT (VIN 020001-39272) & Flying Spur (VIN 026890-39271).

• Engine Type: 6.0L W12 Twin-Turbo.

• Material: UV-stabilized, high-heat polyamide for maximum durability against 100°C+ thermal cycles.

Why the "D" Revision Matters: Many owners mistakenly attempt to fit the later "F" revision into early 2004–2006 cars. This 3W0121403D unit ensures the mounting points and hose diameters match your early-generation cooling cassette perfectly. Replacing a yellowed or brittle tank with this Genuine unit prevents catastrophic pressure loss and protects your W12 cylinder heads from overheating.

Technical Integration Tip

When installing the Genuine 3W0121403D Expansion Tank, it is critical to also inspect the Expansion Tank Cap (3W0121321A). The cap is a pressure-relief valve; if it fails to vent at the factory-specified pressure, it can cause even a brand-new tank to burst or leak at the seams. Additionally, because the W12 engine is highly susceptible to air pockets, we recommend a vacuum-coolant refill after swapping the tank. Ensure you use only the G12/G13 (Purple) spec coolant; mixing with older green or orange coolants can lead to internal corrosion and "sludging" within the intricate passageways of the 2004-2006 radiator.