Parts for your 2018 Toyota Camry-Radiator cap

2018 Toyota Camry radiator cap: what’s actually fitted

Based on Toyota technical material, a traditional radiator-cap on the radiator itself is not used on the 2018 Toyota Camry (XV70). The Owner’s Manual for the 2018 Camry (Do‑it‑yourself maintenance — Engine coolant) instructs owners to check and open the pressurised coolant reservoir cap rather than any cap on the radiator. Toyota’s workshop literature for the XV70 cooling system likewise describes a remote, pressurised expansion tank, and the Toyota Genuine Parts catalogue lists a “Cap, Reserve Tank (pressurised)” for the Camry while not listing a service cap on the radiator assembly. In plain terms, the pressure cap lives on the translucent coolant reservoir, not on the radiator.

Why Toyota doesn’t use a radiator-mounted cap on this model comes down to system design. The 2018 Camry runs a modern, sealed “degas” cooling layout where the highest point in the system is a remote tank with the pressure cap. That design lets the system purge air more effectively, keeps the radiator packaged low under the bonnet for crash and aero performance, and gives drivers a clear view of coolant level without needing to touch a hot radiator neck.

• Better air separation and self‑bleeding via a high‑mounted expansion tank
• Improved safety and serviceability — level checks at a visible reservoir
• Packaging flexibility for cooling, crash performance and aerodynamics

For owners searching for a “radiator cap”, the correct part to inspect or replace on a 2018 Camry is the coolant reservoir’s pressure cap. It does the same job a traditional radiator cap would: it seals and pressurises the cooling system to raise boiling point, then vents to the overflow path if system pressure gets too high. If the cap’s seal hardens, cracks or the spring weakens, you may see slow coolant loss, gurgling after shutdown, or overheating under load.

Simple care tips: only remove the cap when the engine is stone cold, twist it off slowly to bleed any residual pressure, check the rubber seal for nicks or flattening, and replace the cap if there’s any doubt. Use the correct Toyota‑spec cap for the XV70 Camry and top up with Toyota Super Long Life Coolant (pink) mixed to spec. If overheating, hoses collapsing, or discoloured coolant is observed, have the system pressure‑tested and the cap checked as part of diagnosis.

Does the 2018 Camry have a traditional radiator cap?

No. On the 2018 Toyota Camry the pressure cap is fitted to the coolant reservoir (expansion tank), not the radiator. Owners access and service the reservoir cap for level checks and pressure sealing.

Where does coolant get added on a 2018 Camry?

Coolant is added at the pressurised reservoir. With the engine cold, remove the reservoir cap slowly and fill to the “FULL COLD” mark using Toyota‑approved coolant. The radiator itself isn’t opened during normal servicing.

Should the reservoir cap be replaced as maintenance?

It’s smart preventative maintenance. If the cap’s seal is perished or its spring weak, system pressure drops and the car can overheat. Inspect it each service and replace at the first sign of damage, or on schedule if recommended by a technician.