Parts for your 2020 Toyota Land cruiser-Radiator cap

2020 Toyota Land Cruiser Radiator Cap — What It Does and When to Replace It

Yes, the 2020 Toyota Land Cruiser (J200 Series) uses a radiator cap. This is confirmed by Toyota’s workshop literature for the J200 cooling system (radiator cap inspection procedure is listed in the Cooling section), the Owner’s Manual safety notes about not removing the cap when hot, and Toyota’s parts catalogue, which lists a radiator cap sub‑assembly for both the 3UR‑FE petrol V8 and 1VD‑FTV diesel V8. Market part numbers vary, but a common Toyota Genuine 1.1 bar cap is catalogued for this model line.

On a 2020 Land Cruiser, the radiator cap is a pressurised cap mounted on the radiator filler neck. Its job is simple but critical: it seals the cooling system so it can build pressure, raising the coolant’s boiling point for reliable temperature control when towing, touring, or crawling in low range. The cap’s pressure valve typically regulates around 1.1 bar (about 108 kPa), and its vacuum valve allows coolant to return from the overflow bottle as the engine cools, keeping air out of the system.

Servicing advice for the Land Cruiser’s radiator cap is straightforward. Inspect the cap at every service or at least every 20,000 km—look for brittle or cracked rubber seals, corrosion on the seat, a sticky valve, or a distorted spring. A workshop can pressure‑test the cap with a cooling system tester, most Toyota 1.1 bar caps pass in the ballpark of 88–118 kPa. If the cap can’t hold rated pressure or the vacuum valve is stuck, replace it. Always match the correct pressure rating and neck depth, on the J200, that’s a 1.1 bar cap designed for the Toyota radiator neck. Using the wrong rating can cause boil‑over or undue stress on hoses and the radiator core.

Only remove the cap when the engine is fully cool. Under the bonnet, the cap is located on the radiator’s top tank near the upper radiator hose (often under a plastic cover). Twist off, inspect the seal and seat, and clean any debris. For outback touring or heavy towing, carrying a spare genuine‑spec cap is cheap insurance. Many owners proactively renew the cap every 80,000–120,000 km or 5–7 years, especially in hot climates, as rubber hardens over time.

• Symptoms of a dodgy cap: coolant pushing into the overflow and not returning, frequent top‑ups, soft or collapsed upper hose after cool‑down, overheating under load, or visible staining around the filler neck.
• Use Toyota Genuine or an OE‑quality 1.1 bar equivalent, confirm by VIN for the exact cap.

Popular questions

Where is the radiator cap on a 2020 Land Cruiser?
It sits on the radiator’s filler neck at the top tank, typically on the left‑hand side when facing the vehicle, often beneath a plastic cover. Only remove it when the engine is stone cold. If unsure, follow the upper radiator hose to the filler neck.

What pressure rating radiator cap does it use?
The J200 commonly uses a 1.1 bar (approx. 108 kPa) cap. The exact specification can vary by market and engine, so check the stamping on your current cap or confirm via the VIN in the Toyota parts catalogue before ordering.

How often should the radiator cap be replaced?
There’s no strict interval, but it’s wise to inspect at every service and replace if it fails a pressure test, the seals are perished, or after 80,000–120,000 km of use. In hotter regions or for vehicles that tow often, earlier replacement is sensible.