Parts for your 2010 Subaru Forester-Water pump

2010 Subaru Forester water pump — what it does and when to sort it

Per the Subaru Factory Service Manual for MY2010 Forester (EJ25), the Subaru Scheduled Maintenance Guide for that model year, and well-known timing system references from Gates and Dayco, the 2010 Subaru Forester (both EJ253 non‑turbo and EJ255 turbo XT) uses a belt‑driven mechanical water pump mounted behind the timing covers. So yes — a water pump is fitted, and it’s a key part of the cooling system on this model.

The water pump’s job is straightforward but critical: it circulates coolant through the block, heads, heater core and radiator to keep engine temperatures in the sweet spot. On the Forester XT, it also helps manage the extra heat of the turbo. A healthy pump prevents hot spots, protects head gaskets, keeps cabin heat consistent, and stops the temperature gauge from creeping up on long climbs or in summer traffic.

For servicing, most technicians recommend replacing the water pump when the timing belt is due — typically around 160,000–168,000 kilometres or about 8–10 years, as outlined in Subaru’s maintenance guidance for EJ engines. Because the pump sits under the timing covers and runs off the same belt, doing them together saves labour and avoids rework. A quality kit usually includes the timing belt, idlers, tensioner, water pump, thermostat and seals. Always use a new gasket, follow the factory torque specs, and refill with Subaru‑approved long‑life coolant. Bleed the system carefully (heater on hot, level the car, use a fill funnel) so no air pockets linger under the bonnet.

• Tell‑tales of a tired pump: coolant seepage under the timing cover, sweet coolant smell, pink/white crusty residue, bearing growl or a wobble at the pulley, creeping temps, or intermittent heater output.
• Coolant: stick with Subaru‑approved long‑life (blue) or an equivalent phosphate‑type long‑life coolant, if using concentrate, mix 50/50 with demineralised water. Don’t mix coolant types.
• Good practice: inspect for leaks and play at every service, replace the radiator cap if weak, and pair a new pump with a genuine‑spec thermostat.

Done right, the 2010 Forester’s water pump will cruise for years. When timing belt time rolls around, swapping the pump proactively is the smart, cost‑effective move many workshops in Australia and New Zealand recommend.

Does a 2010 Subaru Forester have a timing‑belt‑driven water pump?

Yes. Both the EJ253 (non‑turbo) and EJ255 (XT) engines in the 2010 Forester use a mechanical water pump driven by the timing belt and mounted behind the timing covers. That’s why most mechanics replace the pump when doing the timing belt at roughly 160,000–168,000 km.

What are the common signs the water pump needs attention?

Look for coolant weeping from behind the timing cover, a sweet smell, chalky residue, bearing noise or pulley wobble, rising temps in traffic, or a heater that goes cold at idle. Any of these on a 2010 Forester is a prompt to inspect the pump, belt, tensioner and idlers together.

Which coolant should be used after pump replacement?

Use Subaru‑approved long‑life coolant (often the blue type in AU/NZ) or an equivalent that meets Subaru specs. If using concentrate, mix 50/50 with demineralised water. The system holds about six to seven litres, always bleed air thoroughly and follow the vehicle handbook.