Genuine Bentley Continental GT GTC Flying Spur Coolant Expansion Tank 3W0121403F

Brand Name : Bentley

Part Number : 3W0121403F

Condition : New

Availability : In Stock

Price :$545.00

Select Quantity :

Refer to Friend Print

Description

Genuine Bentley Primary Coolant Expansion Tank for Continental GT, GTC, and Flying Spur models (2006–2018). Part Number: 3W0121403F. This is the updated factory-original reservoir, engineered to withstand the high-pressure demands of both W12 and V8 cooling systems while providing clear visibility of fluid levels.

Upgrade or replace your aging cooling reservoir with this Genuine Bentley Primary Expansion Tank. Part number 3W0121403F is the final and most reliable revision for the 2006–2018 Bentley 3W chassis range.

Technical Specifications & Fitment:

Part Number: 3W0121403F (Replaces 3W0121403E)
Chassis Compatibility: Bentley Continental GT/GTC and Flying Spur from approximately VIN 039274 onwards.
Engine Type: Fully compatible with 6.0L W12 and 4.0L V8 Twin-Turbo models.
Material: High-grade reinforced polymer designed for extreme thermal cycling and pressure retention.

The "F" Revision Advantage: Unlike the earlier "D" tanks, the 3W0121403F features reinforced seam welding and an optimized internal baffle system. This prevents the common "false low coolant" warnings caused by sensor float sticking in older units. As a Genuine OEM part, it ensures that your high-pressure coolant hoses seat perfectly without the need for additional sealants or modifications.

Technical Integration Tip

When installing the Genuine 3W0121403F Expansion Tank, it is critical to verify the condition of the coolant level sensor connector (2-pin). Over time, coolant seepage can travel up the wires (capillary action), leading to corrosion in the main wiring harness. If you see any green crust on the pins, clean them with electrical contact cleaner before plugging in the new tank. Additionally, always use a coolant pressure tester to verify the system holds 1.4 to 1.6 bar after installation. If the pressure drops, the issue is often the small return line (bleeder hose) that connects to the top of this tank, which can become brittle and hairline-crack during the swap process.