Parts for your 2012 Honda Cr-v-Radiator cap

2012 Honda CR‑V radiator cap: what it does and when to replace it

Per Honda’s 2012 CR‑V Owner’s Manual (Cooling System), the factory Service Manual (Engine Cooling section), and the Honda parts catalogue for this model year, the 2012 Honda CR‑V is built with a pressurised radiator cap on the radiator. So yes — a radiator cap is fitted and it’s a relevant service item.

The radiator cap does far more than just close the top of the radiator. It’s a pressure valve, typically rated at about 1.1 bar (roughly 16 psi), that raises the coolant’s boiling point so the engine can run efficiently without boiling over. When pressure climbs past the cap’s rating, it vents a little coolant to the overflow bottle, as things cool down, the cap’s vacuum valve draws coolant back from the bottle to keep the system full and free of air. A healthy cap helps maintain stable temperatures, protects hoses, and stops aeration that can chew out water pumps.

On a 2012 CR‑V, it’s smart to check the radiator cap at every service, and especially any time the coolant is changed. A workshop can pressure‑test the cap to its rated value, if it can’t hold pressure or the vacuum valve sticks, replace it. If the vehicle’s history is unknown, popping in a new, quality 1.1‑bar cap is cheap insurance.

• Common signs a cap’s past it:
  • Coolant pushed into the overflow bottle and not returning after cool‑down
  • Random overheating at highway speeds
  • Collapsed upper radiator hose after cooling
  • Crusty staining around the filler neck or cap
  • Perished rubber seal or a sticky centre (vacuum) valve

• Handy service tips for the CR‑V:
  • Only open the cap when the engine is stone cold — hot coolant can cause serious burns
  • Use a genuine or OE‑equivalent 1.1‑bar cap, mixing ratings can upset system pressures
  • Wipe the radiator neck and seating surface clean before refitting
  • After cap replacement or a coolant service, bleed the system and top the radiator (not just the bottle)
  • Fill with Honda Type 2 (blue) premix coolant and confirm the overflow hose is tight and crack‑free

Treat the radiator cap as a small, inexpensive part that protects a very expensive engine. Keeping it in top nick helps the 2012 CR‑V stay cool in Aussie and Kiwi conditions alike.

FAQ

What pressure radiator cap does a 2012 Honda CR‑V use?
Most 2012 CR‑V variants use a 1.1‑bar (about 16 psi) cap. The rating is stamped on the top of the cap. If there’s any doubt, match it to the original or confirm by VIN with a parts counter to avoid over‑ or under‑pressurising the system.

Where is the radiator cap on a 2012 CR‑V?
Lift the bonnet and look at the top of the radiator at the front of the engine bay — the cap sits on the filler neck, slightly offset towards one side. The overflow bottle is separate and not pressurised.

How often should the radiator cap be replaced?
Have it inspected at each service and pressure‑tested during coolant changes. Many owners replace the cap every 5–7 years or 100,000–150,000 kilometres, or immediately if it fails testing or shows damaged seals, staining, or sticking valves.