Parts for your 2020 Toyota Rav4-Radiator cap

2020 Toyota RAV4 radiator cap: what’s actually fitted and why it matters

For the 2020 Toyota RAV4 (XA50 series), a traditional radiator cap on the radiator itself isn’t used. Toyota’s technical documentation for the A25A-FKS/FXS engines (as found in the Toyota Repair Manual and the 2020 RAV4 Owner’s Manual cooling system section) shows a sealed, pressurised cooling system that uses a cap on the coolant reservoir/degassing tank rather than a separate cap on the radiator neck. That reservoir cap performs the pressure and vacuum control duties that an old-school radiator cap used to handle.

This design is chosen for a few solid engineering reasons. Placing the pressure cap on a high-mounted degassing (expansion) tank helps purge air continuously, improving cooling efficiency and making servicing easier. It also reduces scald risk, as the radiator core itself stays sealed, and it tidies up under-bonnet packaging for today’s tighter engine bays. Emissions and durability targets are better met when the system stays sealed and maintains stable pressure.

So, while there’s no separate “radiator cap” to twist off on the radiator, the RAV4 still relies on a pressure cap—just located on the coolant reservoir. That cap’s job is to hold the correct pressure so the coolant’s boiling point is raised, vent excess pressure safely, and allow coolant to return to the system as it cools.

As part of regular servicing, it’s smart for workshops to inspect the reservoir cap on a 2020 RAV4. They’ll check the rubber seal and the spring-loaded valves, confirm the pressure rating on the cap matches Toyota specifications for the vehicle, and replace the cap if the seal is perished, the spring feels weak, or there are signs of staining or crusty deposits around the neck. Always open the cap only when the engine is cold. Coolant level checks should be done at the reservoir, using Toyota Super Long Life Coolant (pink, pre-mixed), and any top-up after work should include proper bleeding per Toyota procedures to avoid trapped air.

• Common signs the reservoir cap may be due: unexplained coolant loss, soft or collapsed hoses after cool-down, gurgling in the heater, or temperature fluctuations under load.
• Best practice: inspect the cap at every service, replace with a genuine-spec cap if there’s any doubt, and keep the sealing surfaces clean.

FAQs

Does the 2020 Toyota RAV4 have a radiator cap?

No. On the 2020 RAV4 (XA50), Toyota uses a sealed radiator and a pressurised coolant reservoir. The pressure cap is on the reservoir/degassing tank, performing the same pressure and vacuum control roles a traditional radiator cap would.

This layout is documented in Toyota’s Owner’s Manual and Repair Manual for the A25A engines, which show checks and filling done at the reservoir, not a radiator neck.

What pressure rating is the coolant cap on a 2020 RAV4?

The cap on the pressurised reservoir is typically around 1.1 bar (about 108 kPa), but the definitive value is stamped on the cap fitted to the vehicle and listed in Toyota service information. Matching the cap’s rating to Toyota specs is important for correct boiling margin and hose life.

If in doubt, a workshop will read the marking on the existing cap and confirm against Toyota parts data for the exact variant (petrol or hybrid).

When should the coolant reservoir cap be replaced on a 2020 RAV4?

There’s no fixed interval in typical Toyota schedules, it’s condition-based. Replace if the seal is cracked or hardened, the spring feels weak, the vacuum valve sticks, or there are repeated cooling issues or coolant staining at the cap.

Many techs treat the cap like a wear item—inspect at every service and consider replacement around the mid-life of the vehicle or sooner in harsh conditions.