Parts for your 2013 Subaru Xv-Radiator cap

2013 Subaru XV radiator-cap — what it does and when to replace it

Technical references confirm the 2013 Subaru XV is fitted with a radiator cap. The Subaru Owner’s Manual for the GP-series XV includes warnings and checks for the radiator cap, the Subaru Workshop Manual for the FB20 cooling system specifies a pressure cap for the radiator filler neck, and the Subaru Genuine Parts catalogue lists a dedicated radiator cap for 2013 XV models. Typical OE spec is around 108 kPa (about 1.1 bar) for naturally aspirated FB engines.

On this XV, the radiator cap is a small but critical piece of kit. It seals and pressurises the cooling system so the coolant’s boiling point is raised, which helps the engine keep its cool on hot Aussie and Kiwi days or when towing up a long hill. The cap’s two-way valve also controls coolant flow to and from the overflow bottle as the engine heats and cools, keeping air out and fluid levels stable under the bonnet.

As part of regular servicing, the radiator cap deserves a quick once-over. A tired cap can cause slow coolant loss, overheating at low speed, or a collapse of the upper hose after shutdown. Owners and workshops should look for cracked or flattened rubber seals, a sticky or weak spring, crusty deposits on the sealing faces, or staining around the filler neck. If any of that shows up, a new cap is cheap insurance.

When replacing, always match the pressure rating printed on the original cap. Going lower can invite boil-over, going higher can stress hoses, the radiator, or the heater core. Stick with a quality OE or OE-equivalent cap with the correct depth and bayonet fit for the XV’s filler neck. Only remove the cap when the engine is stone-cold, cracking it when hot can cause a dangerous release of pressure and scalding coolant.

Good practice is to inspect the cap at every service interval and to replace it proactively during a cooling-system service, especially as the vehicle gets older. If the cap has been off for repairs, confirm the neck is clean and free of nicks, then top up with the correct long-life Subaru coolant mix and bleed the system per Subaru procedure. Keep it simple, keep it genuine, and the XV’s cooling system will stay happy for many more kilometres.

What pressure rating is the radiator cap on a 2013 Subaru XV?

Most non-turbo 2013 XV models use a cap around 108 kPa (about 1.1 bar). Always confirm the rating stamped on the existing cap or under-bonnet decal and match it like-for-like when replacing.

How often should the radiator cap be replaced?

There’s no strict time-based interval, it’s condition-based. Check the cap at every service. Replace it if seals are cracked, the spring feels weak, there’s corrosion or staining, or as a preventative step during a cooling-system service on higher-mileage cars.

What are the signs of a failing radiator cap?

Watch for coolant smell, the overflow bottle overfilling or not drawing back when the engine cools, a soft top hose that collapses after shutdown, random temperature spikes in traffic, or visible crust around the filler neck.