Parts for your 2007 Subaru Forester-Coolant

2007 Subaru Forester coolant — what it does and how to look after it

Coolant is absolutely relevant to the 2007 Subaru Forester — the EJ25-powered Forester relies on an ethylene glycol–based coolant for temperature control, corrosion protection and heater performance. This is documented in the 2007 Forester Owner’s Manual (Cooling System section) and the Subaru Service Manual, and backed by Subaru’s Technical Service Bulletin 09-36-03R, which specifies using Subaru Cooling System Conditioner when renewing coolant on applicable EJ engines. Subaru’s own product literature for Subaru Genuine Long Life Coolant (green) and Subaru Super Coolant (blue) further confirms the required type and service intent.

On this model, coolant circulates through the engine, radiator and heater core to pull heat out of the alloy block and heads, keeping operating temperature steady whether it’s a frosty South Island morning or a hot Aussie summer arvo. It also carries corrosion inhibitors that protect the water pump, radiator and galleries from internal rust and scale, and it lubricates the pump’s mechanical seal. Running plain water is a fast track to overheating, internal corrosion and big repair bills — not worth it under any bonnet, especially on a boxer four where temperature stability really matters.

For servicing, stick with Subaru-approved coolant chemistry. From new, many 2007 cars were filled with Subaru Genuine Long Life Coolant (green). Later, Subaru introduced its blue “Super Coolant” with extended life. Don’t mix types or colours, if changing type, do a complete flush. Use a 50/50 mix with demineralised water if you’re not using a premix. Subaru’s schedule for this era typically calls for coolant replacement about every 30 months/48,000 km on the green fill, and to add Subaru Cooling System Conditioner at each change per TSB 09-36-03R for EJ25 engines. If converting to the blue long-life coolant, follow the bottle and local service documentation for interval guidance.

• Check the level in the radiator (when cold) and the overflow bottle regularly, top up with the same coolant only.
• Inspect hoses, clamps and the radiator cap, a tired cap can cause slow coolant loss and overheating.
• Bleed air properly after a change: heater on full hot, run to operating temp, squeeze the upper hose, and recheck levels once cooled.
• Watch for sweet smells, dried crust near hose joints, or milky residue — all signs it’s time for a cooling system check.

These practices align with Subaru’s factory guidance and help the 2007 Forester run cool, reliable and ready for the next road trip.

Popular questions about 2007 Subaru Forester coolant

What coolant type does a 2007 Subaru Forester use?
Subaru specifies an ethylene glycol–based, phosphate-containing, silicate-free coolant. Many 2007 cars left the factory with Subaru Genuine Long Life Coolant (green). Subaru’s blue Super Coolant can be used if the system is fully flushed first. Always stick with Subaru-approved formulations and avoid mixing colours or brands.

How often should the coolant be changed?
For vehicles running the original green Subaru Long Life Coolant, the typical service interval for this era is about every 30 months/48,000 km, and Subaru recommends adding its Cooling System Conditioner at each change on EJ25 models (per TSB 09-36-03R). If converted to Subaru’s blue Super Coolant, intervals are extended — follow the product label and local service documentation.

Can tap water be used to top up?
It’s best to use the same premixed coolant already in the system. If you must mix from concentrate, use demineralised or deionised water. Tap water can introduce minerals that lead to scale and corrosion, shortening the life of the radiator, heater core and water pump.