Parts for your 2006 Honda Cr-v-Radiator cap

2006 Honda CR‑V radiator cap — what it does and when to replace it

Technical sources confirm a radiator cap is fitted and relevant on the 2006 Honda CR‑V (K24 engine, 2nd generation). The Honda CR‑V 2002–2006 Service Manual (Cooling System) specifies a pressurised cap mounted on the radiator neck, the 2006 Owner’s Manual outlines cap checks alongside the overflow bottle, and Honda’s EPC/parts catalogue lists a 1.1 bar (approx. 108 kPa/16 psi) radiator cap for this model (commonly referenced as Honda P/N 19045‑PAA‑A01 or superseding equivalents). That means the cap is an essential service item, not just a cosmetic lid.

On this CR‑V, the radiator cap seals and pressurises the cooling system so coolant can run hotter without boiling, helping temperature control during summer traffic, towing, or long kilometres on the open road. Its pressure valve holds system pressure to the set rating, while the vacuum valve draws coolant back from the overflow bottle as the engine cools. Done right, it prevents boil‑over, reduces aeration, protects hoses, and keeps the radiator core working at peak efficiency under the bonnet.

As with any wearable component, the cap’s spring, seals and seat can age. Honda’s workshop guidance makes periodic inspection part of routine servicing: check the rubber seal for nicks or flattening, the spring for free movement, and the filler neck for pitting. Many technicians replace the cap preventively every 4–5 years, or immediately after an overheat event. Always use a quality 1.1 bar cap matched to Honda specifications, the wrong rating can invite early boil‑over or excess system stress. Only remove the cap when the engine is completely cold. Wipe the neck clean, ensure the overflow hose is snug, and refit the cap firmly to the fully locked detent. When topping up, use the correct Honda‑approved coolant mix and bleed out air pockets to avoid hot spots.

• Common signs of a tired cap: coolant stains around the neck, hard‑to‑trace coolant loss, gurgling after shutdown, a collapsed upper hose after cool‑down, or creeping temps at idle.
• Simple service tip: a new, correct‑rating cap is inexpensive insurance for stable running and fewer cooling system dramas over many thousands of kilometres.

Popular questions about the 2006 Honda CR‑V radiator cap

Where is the radiator cap on a 2006 CR‑V?
The cap sits on the radiator’s filler neck under the bonnet, typically on the upper tank. The nearby plastic bottle is the overflow reservoir, it is not the pressurised cap.

What pressure rating does the 2006 CR‑V radiator cap use?
It uses a 1.1 bar cap (about 108 kPa or 16 psi). Sticking to the correct rating maintains the intended boiling point and protects hoses, seals and the radiator core.

How often should the radiator cap be replaced?
Inspect at every service. Many workshops replace the cap every 4–5 years, or sooner if there are symptoms like staining, coolant loss, overheating, or after any overheat incident.