Parts for your 2022 Toyota Land cruiser-Radiator cap

2022 Toyota Land Cruiser radiator cap — what it does and when to replace it

Yes, the 2022 Toyota Land Cruiser (300 Series) uses a radiator cap—though on this model it’s mounted on the pressurised coolant surge tank (degas bottle) rather than on the radiator neck. This is confirmed in Toyota’s J300 Owner’s Manual cooling system description, the Toyota Repair Manual for J300 cooling system layout, and the Toyota Electronic Parts Catalogue, which lists a “Cap Sub‑Assembly, Radiator” for the 300 Series. So the radiator-cap is absolutely relevant to this vehicle.

On a 2022 Land Cruiser, the radiator cap’s job is to set and hold the cooling system pressure, which raises the coolant’s boiling point under load—handy when towing, crawling off-road, or tackling hot Aussie and Kiwi summers. The cap also has a vacuum valve that draws coolant back from the overflow as the engine cools, preventing hose collapse and keeping the system full. Positioned on the surge tank, it’s the highest point in the circuit, helping purge air and stabilise temperature on the twin‑turbo V6 petrol or diesel.

Servicing advice for owners: include the cap in routine cooling system checks. Look for brittle or cracked rubber seals, crusty deposits on the cap seat, or a weak spring. If you’ve noticed slow warm-up, intermittent overheating in traffic, coolant stains around the bottle, a collapsing upper hose after shutdown, or gurgling, the cap may not be holding pressure or vacuum correctly.

Best practice in Australia and New Zealand is to pressure‑test the cap whenever the coolant is serviced. Replace it if it fails to hold the specified rating stamped on the cap (Toyota typically uses around 1.1 bar/108 kPa on many models—confirm against your original cap, under‑bonnet label, or by VIN). Stick with a genuine Toyota cap or a quality equivalent with the exact pressure rating, going higher or lower can create new issues.

When fitting a new cap: only open the system stone cold, slowly vent any residual pressure, wipe the sealing surfaces, and lock the new cap fully. Top up with Toyota Super Long Life Coolant (pink, premixed) to the correct mark and recheck level after a few heat cycles. For vehicles that work hard—long corrugated roads, sand, towing—consider proactive cap replacement around the 5‑year/100,000 km mark, or earlier if test results or inspection suggest wear. A healthy cap is cheap insurance for that big alloy radiator, turbos and head gaskets.

• Key signs of a failing cap: coolant weep at the surge tank, hose collapse after cooldown, random temp spikes, or air in the system.
• Always match the exact pressure rating and seal design to the J300 application.

Popular questions

Does the 2022 Land Cruiser actually have a radiator cap?
It does. On the J300 it’s on the pressurised surge tank rather than the radiator itself, but it performs the same pressure and vacuum control roles. Toyota’s J300 manuals and parts listings refer to it as a “Radiator Cap (Cap Sub‑Assembly, Radiator)”.

What pressure rating should the cap be?
Use the rating stamped on the original cap or specified by Toyota for your VIN. Many late‑model Toyotas run about 1.1 bar (108 kPa), but variations exist. Matching the exact rating is important for proper boiling-point control and hose protection.

How often should the radiator cap be replaced?
There’s no strict time limit, but it should be inspected and pressure‑tested at coolant services and replaced if it fails. In harsh Aussie/NZ conditions or heavy-duty use, preventative replacement around 5 years/100,000 km is sensible.