Parts for your 2011 Ford Transit-Radiator cap

2011 Ford Transit radiator cap: is there one?

For the 2011 Ford Transit (V347/V348 generation), a traditional radiator-mounted cap isn’t fitted or used. Ford’s technical literature for this model specifies a sealed cooling system that’s pressurised via a remote expansion/degas bottle with its own pressure cap, while the radiator itself has no serviceable cap. This layout is described in Ford’s Workshop Manual (Cooling System – Section 303-03 for Duratorq TDCi engines) and reflected in the 2011 Transit Owner’s Manual, which guides coolant filling and pressure cautions at the expansion tank only. Independent guides such as the Haynes Transit Diesel (2006–2013) manual likewise show the pressurised cap on the header tank, not on the radiator.

Why doesn’t the 2011 Transit use a radiator cap? Ford designed the cooling system so the highest point is the expansion/degas bottle, making air purge and coolant fill straightforward and safer. The radiator sits lower in the front end and remains a sealed component, pressure control and venting duties are handled by the cap on the bottle. That cap typically holds pressure to increase the boiling point of the coolant, then releases gently if pressure rises too high.

• Better bleeding and filling: locating the cap on the highest tank helps purge air and reduces hot spots.
• Improved packaging and reliability: a sealed radiator means fewer joints and potential leak points up front.
• Safety and access: owners are directed to a clearly marked expansion tank under the bonnet, with warnings to open only when cold.

So, while people often search for a “2011 Ford Transit radiator cap,” what they actually need is the coolant pressure cap on the expansion (header) tank. If that cap’s seal is perished, if it weeps coolant, or if hoses collapse as the engine cools, the cap on the bottle is the part to inspect and replace. Always match the correct cap specification for the engine variant and climate, and only remove it when the system is completely cold.

Popular questions about a 2011 Ford Transit radiator cap

Where is the radiator cap on a 2011 Ford Transit?
It doesn’t have a cap on the radiator itself. The pressure cap lives on the expansion/degas bottle (the translucent header tank) in the engine bay. That’s the only cap you open for coolant service and checks.

What pressure rating should the cap be?
Ford specifies a pressurised system, the exact rating can vary by engine and market, but it’s commonly around the 1.4–1.5 bar range. Always confirm on the existing cap label or by checking the Ford parts listing for the specific VIN.

How can someone tell if the cap needs replacing?
Typical signs include coolant smell, traces of dried coolant around the cap, hoses that collapse after cool-down, or overheating under load. If any of these crop up, test or replace the expansion-tank cap with a correct-spec component.