Parts for your 2017 Honda Cr-v-Radiator cap

2017 Honda CR‑V radiator-cap: what’s actually fitted

Based on Honda technical literature (2017 CR‑V owner’s manual and service information) and parts catalogues, this model does not use a traditional radiator-cap on the radiator neck. Instead, the cooling system is a sealed setup with a pressurised expansion (degas) tank. The pressure cap sits on that tank, not on the radiator itself, and performs the same job a classic radiator-cap used to do.

Why the change? Modern packaging puts the highest point of the cooling system at the expansion tank, not the radiator. By putting the pressure cap there, the system purges air more effectively, reduces the chance of air locks, and makes bleeding the system simpler after coolant changes. It also keeps hands away from the hot radiator core under the bonnet, which is a safety win. The radiator is factory-sealed and plumbed into the loop, the cap on the expansion tank controls pressure and recovery to and from the bottle as the coolant expands and contracts.

What this means for servicing is straightforward: while there’s no radiator-cap on the radiator, the 2017 CR‑V still relies on a pressure cap — it’s just on the expansion tank. That cap is typically rated around 1.1 bar (about 16 psi) and should only be opened when the engine is stone cold. If a cap’s spring weakens or its seals harden, system pressure drops, which can trigger overheating, coolant loss, or lukewarm cabin heat. A quick visual once-over during routine servicing goes a long way: check for perished rubber seals, crusty deposits on the neck, or staining around the tank. Replace the cap if there’s any doubt, they’re inexpensive and critical.

• Open only when cold, wrap a rag around the cap and crack it to the first stop to vent any residual pressure.
• Use a quality 1.1 bar cap that matches Honda specs for the 2017 CR‑V.
• Top up with the correct Honda long-life coolant, and keep the level between the marks on the tank.

Popular questions about the 2017 Honda CR‑V radiator-cap

Where is the radiator-cap on a 2017 Honda CR‑V?
It isn’t on the radiator. The pressure cap sits on the plastic expansion (degas) tank. That cap is the service point for filling and pressure control, so treat it as the system’s radiator-cap. Only remove it when the engine is completely cool.

What pressure rating does the cap need?
Most 2017 CR‑V variants use a cap around 1.1 bar (about 108 kPa/16 psi). Using the correct rating maintains the designed boiling point and flow. A lower-rating cap can invite overheating, a higher one can stress hoses and the tank. Always match the spec on the original cap or trusted Honda data.

When should the cap be replaced?
If there are signs of seepage, white crust, brittle or cracked rubber, or if a pressure test shows it won’t hold the rated pressure. As a preventative move, many techs swap caps every 5–7 years or when doing a major cooling system service. It’s cheap insurance for summer road trips around Aus or NZ.