Parts for your 2012 Subaru Xv-Radiator cap

2012 Subaru XV radiator cap — what it does and how to look after it

Based on Subaru’s technical literature for the GP-series XV (FB20 engine) — including the Owner’s Manual cooling-system guidance and the factory workshop manual diagrams — this model does use a radiator cap function, but it’s mounted on the pressurised coolant filler/header tank rather than directly on the radiator neck. So while you won’t find a cap on the radiator itself, the XV still relies on a pressure cap to manage system pressure, coolant flow to the overflow bottle, and safe bleeding during servicing.

The radiator cap’s job is simple but critical. It seals the cooling system and holds a set pressure (typically around 108 kPa/1.1 bar for the FB20), raising the coolant’s boiling point so it can handle Aussie and Kiwi summer heat, steep climbs, and stop–start traffic without boiling over. When pressure climbs beyond the cap’s rating, the spring-loaded valve lets excess coolant flow to the overflow bottle, as the engine cools, the vacuum valve draws coolant back, keeping the system full and air-free.

As part of regular servicing on a 2012 Subaru XV, the cap on the coolant filler/header tank should be inspected and tested. Subaru service procedures call for checking the sealing surfaces, rubber gaskets, and spring action, and verifying the pressure rating with a cap tester. If the cap can’t hold pressure or the vacuum valve sticks, replace it with a correct-spec cap matched to the FB20 cooling system.

• Tell-tale signs it’s due: coolant smell under the bonnet, crusty residue around the cap neck, frequent low coolant, heater going cool at idle, or creeping temps on climbs.
• Good practice: never open the cap hot, wait until the engine is stone cold. Wipe the neck clean, check the rubber seals for nicks or hardening, and ensure the overflow hose is snug and crack-free.
• Intervals: inspect every service, many techs replace the cap preventatively around 5 years/100,000 km, or any time the cooling system is opened.

When topping up or bleeding the XV, fill via the header tank cap using the correct premix coolant and a proper funnel, then confirm the overflow bottle sits between LOW and FULL when cold. Using a genuine or correct-spec 1.1 bar cap helps the FB20 maintain stable temps, reliable cabin heat, and long water-pump and hose life.

• Where is the radiator cap on a 2012 Subaru XV?
  The XV’s pressure cap is on the pressurised coolant filler/header tank near the top of the engine bay, not on the radiator itself. Pop the bonnet and look for the small plastic/metal tank with the warning label — that’s the one.
• What pressure rating should the XV’s cap be?
  For the FB20-powered 2012 XV, a 1.1 bar (about 108 kPa) cap is typically specified. Always match the vehicle spec listed on the cap or parts catalogue.
• How often should it be replaced?
  Have it tested at each service. Replace if it won’t hold pressure, the seals are perished, or as preventative maintenance around 5 years/100,000 km.

Popular questions about the 2012 Subaru XV radiator cap

Where is the radiator cap located on a 2012 Subaru XV?
It’s on the pressurised coolant filler/header tank, not the radiator. Look for the capped tank high in the engine bay with caution markings. This layout makes bleeding easier and helps keep air out of the FB20’s cooling passages.

What radiator cap pressure does a 2012 Subaru XV need?
Most FB20 XVs use a 1.1 bar (108 kPa) cap. Using the correct rating maintains the right boiling point and flow to the overflow bottle. If unsure, match what’s printed on the existing cap or check the vehicle’s service information.

When should the radiator cap be replaced on an XV?
Test it at every service and replace if it fails to hold pressure, the seals are cracked, or the vacuum valve sticks. Many technicians recommend preventative replacement roughly every 5 years/100,000 km, or any time the cooling system is opened.