Parts for your 2007 Honda Elysion-Radiator cap

2007 Honda Elysion radiator-cap — purpose, location, and service tips

Based on Honda technical references, the 2007 Honda Elysion does use a radiator cap. Honda’s Electronic Parts Catalogue (EPC) for Elysion RR1/RR2 (2004–2008) lists a “Cap, Radiator (1.1)” for the cooling system, and Honda service procedures for the K24A/J30A platforms specify removing the pressure cap on the pressurised reserve tank during coolant bleeding. These references confirm a pressure-type radiator cap is fitted, typically on the pressurised expansion (reserve) tank rather than directly on the radiator.

For the 2007 Honda Elysion, the radiator cap is a small but critical bit of kit. It seals and pressurises the cooling system, usually to about 1.1 bar (roughly 16 psi). That pressure raises the coolant’s boiling point, helping the Elysion keep its cool on hot Aussie and Kiwi days, up steep hills, or when towing. It also manages coolant flow between the pressurised tank and the overflow as the engine heats up and cools down, keeping air out and the system stable.

On this model, the cap is mounted on the pressurised expansion tank near the top of the engine bay, not on the radiator neck. That’s normal for modern Hondas and makes level checks easy under the bonnet. When the cap’s spring or seals get tired, the Elysion can run hotter than it should, push coolant out, or pull hoses flat as it cools — all signs the cap isn’t holding the right pressure.

As part of regular servicing of a 2007 Honda Elysion radiator-cap, it’s smart to:

• Inspect the rubber seals and the spring action every service (or 10,000–15,000 km).
• Pressure-test the cap to its rated value (about 1.1 bar) during coolant changes.
• Replace the cap every 5 years or 100,000 km, or any time there’s overheating, hose collapse on cool-down, or crusty deposits around the cap neck.
• Always match the pressure rating and neck style, genuine or high-quality OEM-equivalent caps are best.

Safety tip: only remove the cap when the engine is stone cold. If a top-up is needed, use the correct Honda-approved coolant mix and bleed air as specified in Honda procedures to avoid hot spots or heater issues.

Done right, a fresh, correctly rated radiator cap helps the Elysion maintain stable temps, protects the head gasket, and keeps the cooling system behaving as it should for the long haul.

Popular questions

What pressure rating is correct for a 2007 Honda Elysion radiator cap?
Most 2007 Elysion variants use a 1.1 bar cap. Check the marking on the existing cap or the Honda part listing for your RR code to confirm. Using the wrong rating can cause early boil-over or excess stress on hoses and seals.

Where is the radiator cap on the Elysion?
It’s on the pressurised expansion (reserve) tank rather than on the radiator itself. Look near the upper radiator support area in the engine bay, you’ll see the twist cap on the plastic tank.

How often should the radiator cap be replaced?
Have it inspected at each service and pressure-tested during coolant changes. As a rule of thumb, replace every 5 years or 100,000 km, or sooner if there are signs of pressure loss, overheating, or visible seal damage.