Parts for your 2020 Honda Cr-v-Radiator cap

2020 Honda CR‑V radiator cap: what it does and when to replace it

Referencing Honda technical material — namely the 2020 CR‑V Owner’s Manual guidance on cooling system checks and Honda Service Information procedures for coolant replacement — this model does use a pressure radiator cap on the radiator filler neck. That means a radiator cap is relevant to the 2020 Honda CR‑V, rather than a completely capless or reservoir‑only setup.

On the 2020 CR‑V, the radiator cap is a pressure valve (typically around 1.1 bar/16 psi) that keeps the cooling system sealed and under the right pressure. Holding pressure lifts the coolant’s boiling point, helps circulate coolant properly, and allows the system to draw coolant back from the overflow bottle as the engine cools. In short, that little cap is doing big work keeping temperatures in check under the bonnet.

For everyday servicing, it’s worth giving the cap a look whenever the coolant is checked or changed. Only inspect or remove it when the engine is stone cold. If the sealing rubber is cracked, the spring feels lazy, or the vacuum valve is stuck, swap it out. A dodgy cap can show up as slow coolant loss, collapsed upper radiator hose after shutdown, overheating in traffic, or gurgling sounds after a drive.

• Use an OEM‑spec cap of the correct pressure rating for the CR‑V.
• Replace the cap proactively every 5–7 years or 100,000 km, or sooner if any symptoms appear.
• During a coolant service, pressure‑test the cap, if it won’t hold its rated pressure or won’t release properly, bin it.

1. With the engine cold, twist the cap off to the first stop to vent any residual pressure, then remove it.
2. Wipe the filler neck clean, inspect the cap’s rubber seals and spring.
3. Refit the cap firmly, top up the overflow bottle to the correct mark.

Because the cap is small and inexpensive, many workshops in Australia and New Zealand treat it as a “cheap insurance” item when refreshing the coolant. It keeps the cooling system happy, helps prevent boil‑over on hot days, and supports steady cabin heating in winter.

• Where is the radiator cap on a 2020 Honda CR‑V?
  Under the bonnet, it’s on the radiator filler neck, typically at the top of the radiator. The translucent overflow bottle nearby has a simple plastic lid — that’s not the pressure cap.
• What pressure rating should the cap be?
  Honda caps for this generation commonly use about 1.1 bar (roughly 16 psi). Always match the OEM spec for your exact variant.
• What are signs the cap needs replacing?
  Unexplained coolant loss, overheating at low speeds, collapsed hoses after shutdown, or crusty deposits around the filler neck are common flags. If in doubt, test or replace.