Parts for your 2009 Subaru Exiga-Radiator cap

Does a 2009 Subaru Exiga have a radiator cap?

Short answer: there isn’t a cap on the radiator itself. On the 2009 Subaru Exiga (YA series), the cooling system uses a pressurised header tank—also called the coolant filler tank—mounted high in the engine bay, and that’s where the pressure cap lives. Technical sources that document this include the Subaru Exiga YA Factory Service Manual (Cooling, CO section), the Subaru FAST parts catalogue (which lists the cap against the filler/header tank rather than the radiator), and the 2009 Exiga Owner’s Manual, which directs coolant checks and top-ups at the filler tank cap under the bonnet rather than at the radiator neck.

Why no cap on the radiator? Subaru designed many EJ-powered models this way to keep the filler point at the highest part of the cooling circuit. That makes bleeding air simpler, helps prevent hot spots, and keeps the radiator itself a sealed, capless unit.

• The pressurised cap is fitted to the header/filler tank, not the radiator.
• This setup improves air purging and reliability by placing the cap at the system’s high point.
• Typical cap ratings are around 108 kPa (1.1 bar) on non-turbo variants and higher (around 137 kPa) on some turbo trims—always confirm against the cap label or owner’s manual.

If you’re shopping for a “radiator cap” for a 2009 Exiga, the relevant part is the pressure cap on the coolant filler tank. When servicing, inspect the rubber seals for nicks, check the spring for a firm, even action, and make sure the mating neck is clean and free of corrosion. Replace the cap if you see perishing, if it doesn’t hold pressure (common signs are coolant push-out into the overflow or slow overheating), or if the rating doesn’t match the vehicle’s spec. Only remove the cap when the engine is completely cool—pressurised systems can release scalding coolant if opened hot.

Popular questions about 2009 Subaru Exiga radiator caps

Where is the radiator cap on a 2009 Subaru Exiga?
It’s on the pressurised coolant filler/header tank near the top of the engine bay, not on the radiator. Subaru places the cap at the highest point to make bleeding easier and to keep the radiator itself sealed.

What pressure rating cap should a 2009 Exiga use?
Most non-turbo models use about 108 kPa (1.1 bar). Some turbo trims specify a higher rating (around 137 kPa). Check the label on the existing cap or the owner’s manual to match the correct rating to your exact variant.

Can an aftermarket “radiator cap” be used on the Exiga?
Yes—provided it matches Subaru’s pressure rating and neck fitment for the Exiga’s filler tank. Stick with known brands, ensure the seals are high quality, and replace the cap if there are any signs of leakage, hardening, or cracking.