Parts for your 2010 Honda Cr-v-Radiator cap

2010 Honda CR‑V Radiator Cap — What It Does and When to Replace It

Yes, the 2010 Honda CR‑V is fitted with a radiator cap. Technical sources including the Honda CR‑V (2007–2011) Service Manual cooling system section and Honda’s Electronic Parts Catalogue list a pressurised radiator cap on the upper tank of the radiator (commonly Honda part number 19045-PAA-A01, 1.1 bar/approx. 16 psi). Aftermarket catalogues from major cooling brands also specify a 16 psi cap for this model, confirming it’s an essential, serviceable item.

The radiator cap isn’t just a lid — it’s a pressure regulator and a two-way valve. By holding the cooling system at about 1.1 bar, it raises the coolant’s boiling point, helping the CR‑V keep its cool on long Kiwi and Aussie drives, steep climbs, or summer heat. When pressure rises too high, the cap lets excess coolant flow to the overflow bottle, as the system cools, the cap’s vacuum valve draws coolant back in, keeping air out and the cooling system stable.

Over time the rubber seals harden, springs weaken, and grit can stop the cap sealing properly. That can lead to slow overheating, gurgling after shut‑down, collapsed hoses, or coolant loss you can’t quite trace. As part of routine servicing, the cap deserves a quick check under the bonnet along with hoses and coolant level.

• Inspect the cap at every service or at least every 20,000–30,000 km.
• Look for perished seals, corrosion, or a crusty seat on the radiator neck.
• Pressure‑test the cap (most workshops can do this) to confirm it holds the rated 1.1 bar.
• Replace the cap if it’s suspect, inexpensive insurance against overheating.

When replacing, stick to the correct pressure rating (1.1 bar/16 psi) and ensure the seating surface on the radiator neck is clean. Fit the cap firmly when the engine is cold — never open a hot system. Pair a fresh cap with the correct coolant: Honda Type 2 long‑life coolant (premix) is the go‑to. If the CR‑V has shown any signs of running hot, consider a cooling system flush, a thermostat check, and a new cap together. A healthy radiator cap helps maintain stable temperatures, protects the head gasket, and keeps the 2010 CR‑V running sweet whether it’s the weekday commute or a weekend run through the ranges.

FAQs

Where is the radiator cap on a 2010 Honda CR‑V?

It sits on the top tank of the radiator, typically towards the passenger side when looking from the front. The overflow bottle is separate and unpressurised — don’t confuse the two.

What pressure cap does the 2010 CR‑V use?

Honda specifies a 1.1 bar (about 16 psi) cap for this generation. Using the correct rating is important to maintain the coolant’s higher boiling point and proper flow between the radiator and overflow bottle.

How often should the radiator cap be replaced?

There’s no hard expiry, but testing or replacing every few years or 40,000–60,000 km is sensible. Replace sooner if there are signs of overheating, coolant loss, or visible wear to the cap’s seals.