Parts for your 2000 Toyota Crown-Radiator cap

2000 Toyota Crown radiator-cap — purpose, fitment and servicing

Based on technical references — including the Toyota Crown S170 series Repair Manual and Toyota’s Electronic Parts Catalogue (1999–2003) — the 2000 Toyota Crown is fitted with a pressurised radiator-cap. On most S170 engines (such as 1G‑FE, 1JZ‑GE and 2JZ‑FSE) the cap sits on the radiator neck or a pressurised header tank, and uses a typical Toyota pressure rating around 1.1 bar (approx. 108 kPa). So the radiator-cap is absolutely relevant on this model and forms a key part of the cooling system.

The radiator-cap does far more than keep coolant from sloshing out. It seals the system so pressure can build as the engine warms up, which raises the coolant’s boiling point and helps the Crown handle hot days and long motorway runs across Aus and NZ. The cap’s two-way valve setup also allows excess pressure to vent to the overflow bottle, then draws coolant back in as the engine cools, keeping the system topped up without air sneaking in.

As part of regular servicing on a 2000 Toyota Crown, the radiator-cap deserves a quick once‑over. A tired cap can cause hard-to-pinpoint issues like slow overheating, coolant loss into the overflow, or hoses that collapse as the engine cools. Any of those can snowball into bigger dramas if ignored.

• Inspect the cap seal for cracks, flattening, or deposits, check the spring moves smoothly.
• Confirm the overflow hose is tight and free of splits, so the vacuum valve can return coolant properly.
• Pressure‑test the cap with a cooling‑system tester to its rated kPa, replace if it won’t hold spec.
• If the cap is rusty, swollen, or the rubber smells burned, bin it and fit a new, correct‑rating unit.
• As a rule of thumb, test annually and replace every 4–5 years, or sooner if there are symptoms.

When replacing, match the pressure rating specified for the exact engine/market, and choose a quality cap compatible with Toyota’s neck design. Always remove the cap only when the engine is cold — under the bonnet it can be under serious pressure when hot. Fitting a genuine‑spec radiator-cap is cheap insurance that helps the Crown’s inline‑six stay cool, the heater work properly, and the coolant stay where it should.

Popular questions about 2000 Toyota Crown radiator-cap

What pressure rating does the 2000 Toyota Crown radiator-cap use?
Most S170 Crowns run a cap around 1.1 bar (about 108 kPa). Exact spec can vary by engine and market, so it’s smart to confirm against the under‑bonnet label or the Toyota EPC for the specific VIN. Running the correct rating helps prevent boil‑over while avoiding excess stress on hoses and the radiator.

Where is the radiator-cap located on a 2000 Crown?
On many S170s it’s right on the radiator neck, visible once the bonnet’s up. Some trims use a pressurised header/expansion tank with the cap mounted there. If the radiator itself has no cap, follow the upper radiator hose to find the pressurised tank and cap.

What are signs the radiator-cap needs replacing?
Look for coolant pushing into the overflow and not returning, collapsed upper hose after cooldown, minor overheating at idle, or crusty deposits and cracked rubber on the cap. A quick pressure test is the clincher — if it can’t hold its rated pressure or the vacuum valve sticks, it’s time for a new cap.