Parts for your 2010 Subaru Impreza-Radiator

2010 Subaru Impreza Radiator — Purpose, Care and Replacement

Based on Subaru’s factory Service Manual for the GE/GH/GR Impreza (Cooling System section), the 2010 Subaru Impreza is fitted with a cross‑flow aluminium radiator with plastic end tanks and an engine‑driven thermostat. The Subaru Owner’s Manual also details coolant and radiator cap checks, and the Genuine Subaru parts catalogue lists a radiator assembly for all 2010 Impreza petrol variants. So the radiator is absolutely relevant and used on this model.

On the 2010 Impreza, the radiator’s job is to pull heat out of the engine coolant so the boxer engine stays in its happy temperature band, whether it’s a frosty Dunedin morning or a scorching Brisbane arvo. Coolant circulates from the engine to the radiator, sheds heat as air passes through the core, then heads back to keep combustion temps in check and oil viscosity stable. For autos, the side tank also houses an ATF cooler circuit, so that radiator is doing double duty.

Servicing is straightforward but matters a lot. Many 2010 cars left the factory with Subaru Super Coolant (blue, long‑life). Workshop practice is to inspect coolant level and condition every service, and replace coolant per the Owner’s Manual and the coolant label—long‑life mixes can go much longer than generic green, but only if they’re the correct spec. Subaru specifies a phosphate, long‑life, silicate‑free coolant, mixing types can shorten service life and cause corrosion. Under the bonnet, a quick look for dried white crust around end tanks, stains near the cap, swollen hoses, or a sweet smell after shutdown can flag early leaks.

When replacement time comes—due to age, damage, or a cracked end tank—good shops swap in an OE‑quality radiator, new cap, and fresh upper/lower hoses with proper clamps. Air bleeding is critical on the flat‑four: heater on full hot, slow fill via the radiator neck, then a thorough burp to purge bubbles. For automatic models, the trans cooler lines must be capped during the job and the ATF level rechecked afterwards. A cooling system pressure test before and after the work helps catch any sneaky leaks.

• Use the correct long‑life coolant, premixed to the right ratio (typically 50/50 by volume).
• Pressure‑test if there’s any overheating, low coolant, or mystery stains.
• Replace the cap if its seal is perished or the spring feels weak.
• Keep fins clear of bugs and road grime for best airflow.

Popular questions about 2010 Subaru Impreza radiators

How often should coolant be changed?
Most long‑life Subaru coolants last significantly longer than conventional mixes, but intervals depend on the exact product and conditions. The Owner’s Manual guidance and the coolant label take precedence. Many owners schedule inspections every service and a full change when pH or freeze protection drifts, or at time‑based intervals if service history is unknown.

What are common signs the radiator is failing?
Tell‑tales include creeping temps at idle, the heater going cold at traffic lights, low coolant with no obvious puddle, a sweet smell, or white/green crust at the end tanks. Plastic end tanks can develop hairline cracks with age and heat cycles.

Is it safe to drive with a small coolant leak?
Not recommended. Small leaks tend to worsen, and air entering the system can cause hot spots in the boxer engine. Short, gentle trips might get the car home, but it should be topped up (engine cold), monitored closely, and properly repaired as soon as possible.