Bentley Continental GT GTC Flying Spur Coolant Expansion Tank – OE 3W0121403C Reservoir
Bentley Continental GT GTC Flying Spur Coolant Expansion Tank – OE 3W0121403C Reservoir
Bentley Continental GT / GTC / Flying Spur Coolant Expansion Tank – 3W0121403C
Replace a cracked, stained or leaking coolant reservoir with a vehicle-specific expansion tank built around OE reference 3W0121403C. The molded chamber, integrated level-sensor location and factory-style hose ports are designed to maintain the cooling system’s reserve volume and pressure-management function.
Fitment
- Bentley Continental GT / GTC applications using 3W0121403C
- Bentley Flying Spur applications using 3W0121403C
- Common superseding references include later 3W0121403-series tank revisions
Construction
- Heat-resistant molded automotive polymer
- Integrated coolant level switch / sensor provision
- Factory-position hose connections
- Pressure-cap filler neck
- Vehicle-specific mounting tabs
Installation
Allow the engine to cool completely before opening the cooling system. Drain coolant as required, disconnect the level-sensor wiring and hoses, remove the original tank and install the replacement in the factory mounting points. Reconnect all hoses and wiring, refill with the correct coolant mixture, bleed the system and inspect for leaks at operating temperature.
FAQ
What OE number does this replace?
The primary reference is 3W0121403C.
Which Bentley models use this tank?
It is used on compatible Continental GT, GTC and Flying Spur cooling systems.
Does it include the reservoir body shown?
Yes. The complete expansion tank assembly shown in the product images is included.
Should coolant be replaced during installation?
Refill the system with the correct coolant specification after installation and bleed out trapped air.
What should be checked before ordering?
Match the original tank reference, hose-port layout and mounting tabs to 3W0121403C.