Parts for your 2019 Subaru Impreza-Radiator hose

2019 Subaru Impreza radiator hose – what it does and when to replace it

Yes, the 2019 Subaru Impreza uses radiator hoses. That’s confirmed by the Subaru factory service manual for the FB20 engine (Cooling section), the Subaru FAST parts catalogue (which lists upper and lower radiator hoses for this model), and aftermarket catalogues from Gates Australia and Dayco New Zealand that supply direct-fit hoses for the 2017–2021 Impreza range. So, a radiator hose is absolutely relevant to this vehicle.

The upper and lower radiator hoses carry coolant between the engine and the radiator. As the engine warms up, the thermostat opens and hot coolant flows through the upper hose to the radiator, where it sheds heat, and returns through the lower hose. On the 2019 Impreza, keeping these hoses healthy is key to stable operating temperature, heater performance, and engine longevity.

While Subaru’s long-life blue “Super Coolant” stretches service intervals, hoses are still wear items. Heat cycles, vibration, oil contamination and ozone eventually age the EPDM rubber. During routine services (typically every 12 months or around 12,500 km in AU/NZ), a quick visual and physical inspection is smart: squeeze for firmness, check the inner bends, and look near clamp areas.

• Watch for: soft spots, swelling, cracks, glazing, bulges, kinks, seepage at clamps, and a sweet coolant smell.
• Good practice: replace hoses in pairs (upper and lower), fit new clamps, and top up with the correct Subaru-approved coolant mix.

There’s no fixed kilometre replacement rule for hoses, but many techs treat 8–10 years or 160,000–200,000 km as sensible preventative timing on late-model Subarus, or earlier if any wear signs appear. In hotter climates, frequent short trips, towing, or lots of stop–start work, lean towards earlier replacement.

When fitting new hoses, choose quality EPDM that matches the Impreza’s routing and diameter. Position clamps behind the hose bead, align them so they don’t rub, and torque to spec. After refilling coolant, bleed air thoroughly: run the engine with the heater on hot, allow fans to cycle, top up the reservoir as needed, and recheck the level and clamps after a couple of drives. Any oil contamination on a hose is a red flag—find and fix the source, then replace the affected hose.

Sorted hoses keep the FB20 running cool and happy, which saves head gaskets, protects the water pump, and makes summer traffic far less stressful.

Popular questions about 2019 Subaru Impreza radiator hoses

How often should radiator hoses be replaced on a 2019 Impreza?
There’s no hard kilometre limit in Subaru schedules, but hoses should be inspected at every service. Many workshops in Australia and New Zealand recommend preventative replacement around 8–10 years or 160,000–200,000 km, or immediately if there are signs of softening, cracking, swelling, bulging, or leaks.

What coolant should be used after a hose change?
Use Subaru-approved long-life coolant (the blue “Super Coolant” type) or an equivalent that meets Subaru specifications, premixed to the right ratio. Always bleed the cooling system properly after refilling to avoid hot spots and erratic temperature readings.

Is it safe to drive with a weeping or cracked radiator hose?
Not recommended. Even a small weep can become a sudden split, dumping coolant and risking an overheat. If a hose is suspect, top up coolant if needed and arrange a replacement promptly—better to fix it than risk engine damage.