Parts for your 2018 Ford Kuga-Radiator cap

2018 Ford Kuga radiator cap — is it actually a thing?

Short answer: a traditional radiator cap isn’t used on the 2018 Ford Kuga. Instead, this model runs a sealed, pressurised cooling system that uses a pressure cap on the plastic coolant reservoir (often called the degas or expansion bottle), not on the radiator itself.

Technical sources back this up. The 2018 Ford Kuga Owner’s Manual refers to opening the “coolant reservoir cap” and warns against removing it when hot, with no mention of a cap on the radiator. Ford’s Workshop Manual (WSM) for Kuga/Escape models (Section 303‑03, Engine Cooling) shows the system layout with a remote degas bottle and a “pressure relief cap”, and the radiator is depicted without a serviceable cap. Ford parts catalogues list a “coolant reservoir pressure cap” for this model range and do not list a separate radiator cap.

Why there’s no radiator cap on the 2018 Kuga comes down to how modern cooling systems are engineered:

• Remote, pressurised degas bottle sits at the highest point, helping purge air and keep the system full for consistent cooling.
• Fewer leak points and cleaner packaging in a tight engine bay, with hoses routed for better service access.
• Stable pressure control at the reservoir cap improves boiling margin and reduces localised hot spots.
• Improved emissions and warm‑up behaviour by keeping the system fully sealed.

So if someone’s searching for a “radiator cap” for a 2018 Ford Kuga, what they actually need is the coolant reservoir (degas bottle) pressure cap. Always match the cap’s pressure rating and specification to the vehicle’s build and engine variant, the correct rating is shown on the original cap and specified in the owner’s manual/WSM. Only open the cap when the engine is stone cold. If there are signs of dried coolant around the neck, a perished seal, frequent coolant loss, or hoses going rock‑hard quickly after start‑up, the cap may be past it and worth replacing. Use the correct Ford‑approved coolant and refill/bleed procedures noted in the WSM to avoid trapped air.

Technical sources referenced: 2018 Ford Kuga Owner’s Manual (Cooling System section and warnings regarding the coolant reservoir cap), Ford Workshop Manual (WSM) Section 303‑03, Engine Cooling, component location and system description for Kuga/Escape, Ford parts catalogues listing “coolant reservoir pressure cap” (no separate radiator cap) for 2018 Kuga variants.

Popular questions

Does a 2018 Ford Kuga have a radiator cap?
No. It uses a sealed cooling system with the pressure cap on the coolant reservoir (degas bottle) under the bonnet. The radiator itself doesn’t have a removable cap.

Where is the coolant cap on a 2018 Kuga, and can it be opened hot?
The cap is on the plastic coolant reservoir, typically on the passenger side of the engine bay. Never open it when the engine is hot. Wait until it’s completely cool, then open slowly with a cloth to release any residual pressure.

Which cap should be used if the original is worn?
Use a genuine or quality OEM‑equivalent coolant reservoir pressure cap with the same pressure rating specified for the vehicle. Check the rating on your existing cap or in the owner’s manual/WSM, and confirm by VIN if unsure. Replacing like‑for‑like helps maintain correct boiling protection and hose/seal longevity.