Parts for your 2014 Ford Fiesta-Radiator cap

2014 Ford Fiesta radiator cap — what’s actually fitted

The 2014 Ford Fiesta doesn’t use a traditional radiator-mounted cap. Ford’s cooling layout for this model seals the radiator and manages filling and pressure via a remote, pressurised coolant expansion tank (often called a degas bottle). This is documented in the Ford Owner’s Manual (2014) under Cooling System and the Ford Workshop Manual, Section 303-03 Engine Cooling, which direct all checking, topping-up and venting through the expansion tank and its pressure cap, not the radiator itself.

Why no radiator cap? The Fiesta’s compact engine bay and low bonnet line benefit from a high-mounted expansion tank that becomes the system’s highest point. That design improves self-bleeding of air, stabilises pressure and temperature, and reduces spill risk. With the radiator sealed, the cap on the expansion tank does the pressure regulation and safety venting. It’s a modern, cleaner solution that supports emissions and packaging goals while making servicing more straightforward.

For owners searching “radiator cap” for a 2014 Fiesta, the relevant part is the coolant expansion tank cap. That cap is the pressure cap for the entire cooling system. On many Fiesta engines it’s typically around 140 kPa (about 20 psi), but the exact rating is moulded on the cap itself and should be matched when replacing.

• Servicing pointer: Only open the expansion tank cap when the engine is completely cold. Releasing pressure hot can cause scalding.
• Inspection: Check the cap’s rubber seal for hardening, cracks, or flattening, and ensure the threads and seat are clean. Look for white crusty deposits, fuelly odours in coolant, or repeated hose collapse after cool-down—these can indicate a weak cap.
• Replacement: If there are cooling complaints like random overheating, coolant loss via the overflow, or poor heater performance at idle, a pressure test of the cap is worthwhile. Given the vehicle’s age, preventative replacement with a quality, correct-rating cap is inexpensive insurance.
• Coolant top-up: Use the Ford-specified coolant and concentration, fill at the expansion tank, and follow the bleed procedure outlined in Ford documentation to avoid trapped air.

There’s no cap to remove on the radiator itself on this Fiesta—attempting to find or force one isn’t applicable. The expansion tank cap does the job.

Popular questions

Does a 2014 Ford Fiesta have a radiator cap?
No. The radiator is sealed. Pressure control and filling are handled by the cap on the coolant expansion (degas) tank, per the Ford Owner’s Manual and Workshop Manual.

What pressure rating is the Fiesta’s coolant cap, and can a bad cap cause overheating?
Many are around 140 kPa (about 20 psi), but the exact rating is printed on the cap and should be matched. A weak cap can lower the coolant’s boiling point, cause loss through the overflow, introduce air, and contribute to overheating or weak cabin heat.

How should the cap be replaced on a 2014 Fiesta?
Only when the engine is stone cold: unscrew the cap slowly, check the sealing surface, fit the new correct-rating cap, and top up at the expansion tank with the specified coolant mix. After a drive and full cool-down, recheck the level.