Parts for your 2022 Ford Transit-Radiator cap

2022 Ford Transit radiator-cap: is there one, and what should owners know?

Short answer: there’s no traditional radiator cap on the 2022 Ford Transit’s radiator. The cooling system is a sealed, pressurised setup that uses a cap on the coolant reservoir (also called the degas bottle) to control pressure and allow expansion. The radiator itself has no removable cap under the bonnet.

This isn’t guesswork. Ford’s 2022 Transit Owner’s Manual points owners to the coolant reservoir and warns not to open its cap when hot, with no instruction to access a cap on the radiator. The Ford Workshop Manual (WSM) for Transit, Section 303‑03 (Engine Cooling), specifies system pressure via the reservoir cap and details service procedures at the degas bottle. Genuine parts catalogues list a “coolant reservoir cap/pressure cap” for Transit rather than a radiator neck cap. Taken together, those technical sources confirm a radiator-mounted cap is not used on this model.

Why did Ford do away with a radiator cap? Modern cooling systems place the highest point at the reservoir, which improves automatic air purging, raises the system fill point, and keeps fingers away from the hot radiator. The pressure cap on the reservoir regulates boiling point (typically around 20–21 psi, approx. 138–145 kPa for late‑model Transits per Ford cooling specs), routes expanding coolant to the tank, and returns it as the engine cools. It’s safer, tidier, and helps maintain stable engine temperatures and heater performance.

What should a Transit owner do about the “radiator cap” then? Treat the reservoir cap as the functional equivalent:

• Only open when the engine is cold. Hot coolant can jet out under pressure.
• Check the cap seal and locking tabs during routine servicing. Perish cracks, a weak spring, or distorted seals can cause slow leaks, collapsed hoses after cool-down, or erratic temps.
• Match the cap’s pressure rating to the OE spec printed on the old cap/label. Don’t up‑ or down‑rate.
• If in doubt, have a shop pressure‑test the cap, replace if it won’t hold rated pressure.
• Top up with the Ford‑specified coolant type and mix shown on the reservoir label/owner’s manual. Don’t mix colours or chemistries.

Bottom line: while there’s no radiator-mounted cap on a 2022 Ford Transit, the reservoir pressure cap is critical. Keeping it healthy helps prevent overheating, coolant loss, and undue stress on hoses and the water pump.

Technical sources referenced:

• Ford Owner’s Manual — 2022 Transit: Cooling system and “Engine coolant” section.
• Ford Workshop Manual (WSM) — Section 303‑03: Engine Cooling, specifications and service procedures.
• Ford/Motorcraft parts catalogues: listing for coolant reservoir (degas bottle) pressure cap for Transit.

Popular questions about 2022 Ford Transit radiator-cap

Where is the radiator cap on a 2022 Ford Transit?
There isn’t one on the radiator. The pressure cap is on the translucent coolant reservoir (degas bottle) on the passenger side of the bay in most layouts. That cap handles system pressure and topping up.

What pressure cap does the 2022 Transit use?
Most late‑model Transits use a cap around 20–21 psi (about 138–145 kPa). Always confirm the exact rating on the existing cap or in the owner’s manual and match it when replacing.

How often should the reservoir cap be replaced?
Inspect it at each service. Replace if the rubber seal is cracked, swollen, or if it fails a pressure test. Many owners swap caps proactively every 5–7 years, especially in hot climates or high‑kilometre use.