Parts for your 2018 Subaru Impreza-Radiator

2018 Subaru Impreza Radiator — What it does and how to look after it

Technical sources confirm the 2018 Subaru Impreza is fitted with a conventional liquid-cooling system that includes a front-mounted aluminium radiator. Subaru’s workshop manual for the 2017–2019 Impreza (FB20 engine, Cooling System section), Subaru’s Global Technical Information/Service Manual, and the Subaru Genuine Parts catalogue for this model year all document the radiator, electric cooling fans, surge tank, thermostat, and associated hoses as standard equipment.

This radiator’s job is simple but critical: it sheds heat from the engine coolant so the 2.0‑litre FB20 boxer runs at the sweet spot for power, efficiency, and longevity. Coolant circulates through the engine, picks up heat, and passes it through the radiator’s core where airflow and twin electric fans pull the temperature back down. The A/C condenser sits ahead of it under the bonnet, so good airflow through the stack matters, especially on hot Aussie and Kiwi summer days or when hauling up long hills.

As part of regular servicing, the radiator and cooling system deserve a quick once‑over. Check the coolant level in the surge tank when cold, look for any dried crusty residue around hose joints, the radiator end tanks, and the cap, and make sure the fins aren’t blocked by bugs or road debris. Use Subaru-approved premixed long‑life coolant (the blue Subaru Super Coolant), and never top up with plain water unless it’s an emergency. If the coolant looks rusty, oily, or murky, it’s time for a flush and refill using the correct spec. Follow the owner’s manual or dealer schedule for change intervals, as late‑model Subarus typically run extended‑life coolant.

Replacement is straightforward for a trained tech: drain the system, remove the under‑tray, disconnect the fan harnesses and upper/lower hoses, lift the radiator and shroud out, transfer any brackets, then refill and bleed with a vacuum fill tool to avoid air pockets. CVT models may have additional coolant hoses for the transmission warm‑up circuit nearby, so take care not to mix them up. Always pressure‑test after refitting and verify the fans cut in as expected. If there’s been an overheating event, consider replacing the radiator cap and inspecting the thermostat and hoses at the same time.

• Common signs it’s time to act: rising temp gauge, sweet coolant smell, blue/green puddles under the front, fans running constantly, or visible fin damage.
• Pro tips: keep the fins clean, use the correct coolant, and fix small weeps early to avoid bigger bills.

Does the 2018 Subaru Impreza have a radiator?

Yes. The 2018 Impreza’s FB20 engine is liquid‑cooled and uses an aluminium radiator with electric fans. This is documented in Subaru’s factory service information and parts catalogue for the 2017–2019 model years.

How often should the coolant be changed?

Follow the owner’s manual for your build and climate. Many late‑model Subarus use long‑life blue coolant with extended intervals, but age, kilometres, and conditions (stop‑start city use, towing, or hot climates) can shorten practical service life. A workshop can test coolant condition and advise.

Is it safe to drive with a small radiator leak?

Best avoided. Small leaks often grow quickly, and low coolant can overheat the engine. If you must move the car, keep trips short, watch the temp gauge like a hawk, and book a repair as soon as possible.