Parts for your 2013 Toyota Crown-Radiator cap

2013 Toyota Crown radiator cap: what it does and when to replace it

Based on Toyota’s technical literature for the S210-series Crown (2012–2018) — specifically the Cooling System section of the Toyota Repair Manual and the Toyota Electronic Parts Catalogue (EPC), which lists a “Radiator Cap Sub-Assembly” for these models — the 2013 Toyota Crown is fitted with a pressure-type radiator cap. On some variants the cap sits on the radiator neck, on others it’s on a pressurised surge (header) tank. Either way, a dedicated pressure cap is used and is very much relevant to the cooling system.

The cap’s job is simple but critical. It seals the system and holds a set pressure (commonly around 0.9–1.1 bar), which bumps up the coolant’s boiling point so the Crown can cope with Aussie and Kiwi heat without boiling over. Inside the cap there are two valves: one relieves excess pressure to the overflow bottle when things get hot, the other lets coolant draw back in as it cools, preventing hoses from collapsing and keeping the system topped up. A healthy cap protects the alloy heads, the water pump, the heater core — the lot.

As part of routine servicing, this is one small part that deserves a look. Smart shops will:

• Inspect the rubber seals and spring for cracking, swelling or corrosion.
• Pressure-test the cap to its stamped rating using a cap tester.
• Check the neck or surge tank lip for pitting that can stop a good seal.
• Verify that the overflow hose is tight and unobstructed.

Replacement isn’t expensive, and it’s cheap insurance. A practical rule of thumb is to replace the cap every 5 years or 80,000 km, or immediately if it fails a pressure test. Always match the pressure rating shown on the original cap or under-bonnet label, Toyota Crowns of this era typically use 0.9–1.1 bar. Pair the cap with Toyota Super Long Life Coolant (pink, pre-mix) and never mix coolants.

Safety-wise, don’t open the cap when the engine’s hot — let it cool right down. After any cooling system work, fill at the cap neck or surge tank, set the heater to HOT, run the engine and burp the hoses to purge air. Recheck the level stone-cold the next day. For hybrid variants with electric pumps, follow the repair manual’s specific bleed procedure. If the overflow bottle keeps overfilling, there’s a sweet coolant smell, temperature swings at highway speeds, or hoses collapse when cold, a tired cap is high on the suspect list.

What pressure rating does a 2013 Toyota Crown radiator cap use?

Most S210 Crowns run a cap stamped around 0.9–1.1 bar (90–110 kPa). The exact figure can vary by engine and whether the cap sits on the radiator or a pressurised surge tank. The safest move is to match the number stamped on the existing cap or the under‑bonnet specification. Using a cap that’s too high can stress hoses and seals, too low can allow boil‑over on steep climbs or hot days.

How often should the radiator cap be replaced on a 2013 Toyota Crown?

Have it checked at every service and replace it about every 5 years or 80,000 km, sooner if it fails a pressure test or shows damaged seals, rust or a sticky valve. Given how inexpensive the cap is compared with the cost of overheating, many workshops proactively fit a new, correct‑rating cap whenever they perform a major coolant service.

What are the warning signs of a failing Crown radiator cap?

Common clues include the overflow bottle repeatedly filling and not returning, a sweet coolant smell after shutdown, dried pink residue around the neck, temperature fluctuations at highway speed, coolant loss with no obvious leak, or radiator hoses collapsing once the engine cools. Any of these are a nudge to test or replace the cap and recheck the cooling system for air or other faults.