Parts for your 2014 Toyota Crown-Radiator cap

2014 Toyota Crown radiator cap — fitment, purpose and easy service tips

Yes, the 2014 Toyota Crown (S210 series) uses a pressurised radiator cap. This is confirmed by Toyota’s Electronic Parts Catalogue for the S210 Crown “Radiator & Water Outlet” section, which lists a Cap Sub‑Assembly, Radiator (common Toyota part numbers include 16401‑31650 at ~1.1 bar and 16401‑20353 at ~0.9 bar, engine‑dependent). Toyota’s Crown repair manual also includes an on‑vehicle inspection for the radiator cap with a specified opening pressure in the typical Toyota range of roughly 0.9–1.1 bar. So the radiator cap is absolutely relevant on a 2014 Toyota Crown.

The radiator cap on a 2014 Toyota Crown isn’t just a lid, it’s a pressure valve that keeps the cooling system sealed so the coolant’s boiling point is raised, helping the engine stay at the right temp even on a stinking hot day. It also has a vacuum valve that draws coolant back from the overflow bottle as the engine cools, keeping air out and the system topped up. On hybrid variants, the engine loop still uses a conventional pressure cap, while the inverter has its own separate reservoir and cap.

As part of regular servicing, it’s smart to check the cap any time the coolant is changed or if there are cooling complaints. Look for perished or flattened rubber seals, crusty deposits on the seat, damaged tangs, or a spring that feels lazy. If you’ve got access to a cap tester, confirm the opening pressure matches the spec on the cap sticker (usually around 0.9–1.1 bar for Crowns of this vintage). Replace the cap if it can’t reliably hold pressure or if there’s any doubt — they’re inexpensive and can save a cooked head gasket.

When replacing, match the pressure rating and neck type, and stick with a quality or genuine cap. Always remove the cap only when the engine is stone cold. If the system has been opened, bleed it properly to avoid air pockets. Pair a fresh cap with the correct Toyota Super Long Life Coolant, check for leaks under the bonnet after a few heat cycles, and keep an eye on the overflow level for a week or so.

• Common symptoms of a dodgy cap: slow coolant loss, staining around the neck, hoses collapsing after cool‑down, overheating in traffic, or the overflow bottle not returning coolant.
• Typical replacement interval: inspect every service, many owners pre‑emptively replace around 5 years/100,000 km or when doing a major cooling system refresh.

FAQs

What pressure radiator cap does a 2014 Toyota Crown need?

Most 2014 Crown engines use a cap in the 0.9–1.1 bar range. Toyota EPC listings commonly show 0.9 bar (e.g., 16401‑20353) on some four‑cylinders and 1.1 bar (e.g., 16401‑31650) on V6 variants. Always match the rating printed on your original cap or check the under‑bonnet sticker and the Toyota parts catalogue by VIN.

How can someone tell if the radiator cap on a 2014 Crown is failing?

Typical clues include coolant pushing into the overflow and not returning, collapsed upper hose after cool‑down, visible crusting around the filler neck, or temperature creeping up at idle but fine on the open road. A quick pressure test of the cap will confirm if it opens and holds at the correct kPa rating.

Do Crown Hybrid models use a different setup?

The Crown Hybrid has two cooling circuits: the engine loop still uses a standard pressure radiator cap on its filler neck, while the hybrid inverter has a separate reservoir and cap with its own service checks. Make sure you’re testing and replacing the correct cap for the circuit you’re servicing.