Parts for your 2020 Ford Transit-Radiator cap

2020 Ford Transit radiator cap: what’s actually fitted

There isn’t a traditional radiator cap on the 2020 Ford Transit’s radiator. Instead, the cooling system is a sealed, pressurised setup that uses a remote-mounted coolant reservoir (often called a degas bottle) with its own pressure-relief cap. The radiator itself has no filler neck or serviceable cap.

This layout is confirmed by Ford’s technical literature: the 2020 Transit Owner’s Manual (Engine Coolant section) warns to only open the coolant reservoir cap when the engine is cold, and the Ford Workshop Manual (WSM, Section 303-03 Engine Cooling) details the pressurised degas bottle and cap as the service point for filling, bleeding and pressure control—no radiator filler cap is specified. Ford parts catalogues for this model list a “Coolant Expansion Tank/Reservoir Cap” rather than a radiator cap.

Why Ford doesn’t use a radiator cap on the 2020 Transit:

• Air purge and packaging: Mounting the reservoir higher than the engine helps purge air and simplifies cooling-system routing under the bonnet.
• Safety: A remote pressure cap keeps scalding steam and hot coolant away from the radiator face and fan area.
• Serviceability: All filling, level checks and pressure control happen at one cap on the reservoir, making checks quick and consistent.
• Modern radiator design: The aluminium crossflow radiator is built without a filler neck, it’s fed via hoses from the degas bottle.

If someone’s shopping for a “radiator cap” for a 2020 Transit, what they actually need is the coolant reservoir pressure cap. It’s a critical bit: the cap holds system pressure (typically around 140 kPa/20–21 psi—check the label on the cap or the owner’s manual for the exact spec), which raises the coolant’s boiling point and keeps the van happy on long hauls and hot days.

Quick care tips for the reservoir cap on a 2020 Transit:

1. Only remove the cap when the engine is stone cold.
2. Inspect the rubber seals for nicks, flattening or deposits, replace the cap if the seal looks tired or if you smell coolant and see crusting around the neck.
3. Use the correct pressure-rated cap, the wrong rating can cause overheating or hose damage.

Technical sources referenced: Ford 2020 Transit Owner’s Manual (Engine Coolant/Adding Coolant guidance), Ford Workshop Manual (WSM) Section 303-03 Engine Cooling for 2020 Transit, and Ford/Motorcraft service parts catalogues identifying the “Coolant Expansion Tank (Degas Bottle) Cap” for this model.

FAQs

Does the 2020 Ford Transit have a radiator cap?
No. The system uses a pressurised coolant reservoir (degas bottle) with a pressure-relief cap. The radiator itself has no filler cap.

What pressure cap does a 2020 Transit use?
Most 2020 Transits use a cap rated about 140 kPa (around 20–21 psi). Always match the rating shown on your existing cap or in the owner’s manual to avoid cooling issues.

How do you replace or check the coolant reservoir cap on a 2020 Transit?
Let the engine cool fully, then slowly turn the cap off. Check the rubber seal for cracks or flattening and the neck for deposits. Replace the cap if worn or if there are signs of leakage. Refit the correct, pressure-rated cap snugly.