Parts for your 2013 Subaru Exiga-Radiator cap

2013 Subaru Exiga radiator cap — purpose, fitment and easy service tips

Based on the Subaru Factory Service Manual for the Exiga YA series (Cooling System section) and Subaru’s OEM parts catalog diagrams for 2012–2014 Exiga models, this vehicle is fitted with a pressurised radiator cap. On many Exiga variants the pressure cap sits on the pressurised header tank (degas bottle) rather than directly on the radiator neck, but it’s still commonly referred to as the radiator cap. So yes — a radiator-cap is relevant and used on the 2013 Subaru Exiga.

For the Exiga, the radiator cap’s job is simple but critical. It seals the cooling system and holds a set pressure so the coolant can run hotter without boiling, which helps keep temperatures steady under the bonnet, up hills, or when towing. Inside the cap there’s a spring-loaded pressure valve and a vacuum valve. As coolant expands with heat, excess pressure lifts the valve and sends coolant to the overflow bottle. As it cools and contracts, the vacuum valve draws coolant back, keeping the system topped up and free of air.

Because that tiny spring and the rubber seals work hard, the cap deserves regular attention at service time. A tired cap can cause sneaky overheating, coolant loss, hard or collapsed hoses, and brownish residue around the filler neck. Under routine servicing, they’ll check the cap’s pressure rating against the vehicle spec, inspect the rubber gasket and seat for nicks or flattening, and replace the cap if it fails a pressure test. It’s smart practice to renew the cap proactively every few years or when there’s any doubt — it’s inexpensive insurance for the engine.

Handy tips for owners:

• Only remove the cap when the engine is stone cold. Use a rag and open slowly.
• Confirm the correct pressure rating for the exact Exiga variant (NA vs turbo may differ). Match OEM spec printed on the original cap or in the manual.
• At each service, ask for a cap pressure test and a look over the seal and seat.
• Use the correct Subaru-approved coolant and keep the overflow bottle filled to the marks so the cap can do its job of push-and-pull properly.

Treat the radiator cap as a small part with big responsibility. Keeping it fresh helps the 2013 Subaru Exiga run cool, reliable, and happy on Aussie and Kiwi roads.

Where is the radiator cap on a 2013 Subaru Exiga?

On many Exiga variants the pressure cap lives on the pressurised header tank near the top of the engine, not on the radiator itself. It’s the highest point in the system to help purge air. Always check and open only when the engine is fully cold.

What pressure rating cap should be used?

Use the pressure rating specified for the exact Exiga engine variant. The rating is printed on the OEM cap and listed in the service manual. Matching the factory spec is important for proper boiling margin and hose longevity.

What are common signs the radiator cap needs replacing?

Look for unexplained coolant loss, overheating at highway speeds, coolant stains around the filler neck, and hoses that feel unusually hard when hot or collapse when cooling. A pressure test during servicing is the quickest way to confirm cap health.