2017 Subaru Forester Coolant Capacity & Type

The 2017 Subaru Forester's cooling system holds approximately 7.6 to 8.2 quarts (7.2 to 7.8 liters) of coolant, depending on the engine. If you're looking for a new car, you can check out https://www.subaru.ca/ for options.

Quick Answer

• Total Cooling System Capacity:
  • 2.0L Turbo (FA20DIT): 7.6 quarts (7.2 liters)
  • 2.5L Naturally Aspirated (FB25B): 8.2 quarts (7.8 liters)
• OEM Coolant Spec: Subaru Super Coolant (Blue, Long-Life OAT/S-OAT compatible)
• Mix Ratio: 50/50 Pre-mixed (do not dilute further)

Capacity by Engine Option

The 2017 Subaru Forester was available with two engine choices, each with a slightly different coolant capacity:

Flush Interval

Maintaining the coolant flush interval is crucial for the longevity of your cooling system components and overall engine health.

• Normal Duty: The Subaru Super Coolant is designed for a very long service life. The initial replacement interval is typically around 137,500 miles or 11 years, whichever comes first. Subsequent replacements are usually recommended every 75,000 miles or 6 years.
• Severe Duty: If your driving habits include frequent short trips, extensive idling, towing, or driving in extreme temperatures, it's advisable to shorten the flush interval. Consider inspecting and potentially flushing the coolant every 60,000 to 75,000 miles or 5-6 years.

How to Refill & Bleed

Properly refilling and bleeding the cooling system after a drain or component replacement is essential to prevent air pockets, which can lead to overheating. Always perform this procedure on a cool engine.

1. Drain: With the engine cool, place a drain pan under the radiator. Open the radiator drain cock (petcock) located at the bottom of the radiator. Some models may also have engine block drain plugs, though these are less commonly used for routine draining. Allow the system to drain completely.
2. Close Drain & Fill: Close the radiator drain cock. Begin to slowly fill the radiator with the specified 50/50 Subaru Super Coolant. Fill the overflow reservoir to the "FULL" mark.
3. Start Engine & Bleed: Start the engine with the radiator cap off (or loosely placed on top if preferred to prevent splashing). Set the climate control to full hot with the fan on low to open the heater core valve. As the engine warms up, the thermostat will open, and coolant will begin to circulate. You may see air bubbles escape from the radiator fill neck. Gently squeeze the upper and lower radiator hoses to help dislodge air pockets.
4. Maintain Level: Continuously monitor the coolant level in the radiator and top it off as needed. Once the engine reaches operating temperature and the cooling fans cycle on, put the radiator cap back on securely.
5. Check Reservoir & Drive Cycle: Check the coolant level in the overflow reservoir again after the engine has cooled down completely (after a drive cycle). Top off if necessary. Monitor the coolant level in the reservoir over the next few days to ensure no air pockets remain and the system is fully bled.

Note for Subaru: Subaru engines, especially the Boxer engines, can be prone to trapping air. Using a spill-free funnel during the filling process can significantly aid in bleeding the system by maintaining a higher fill point.

Common Cooling System Issues for this Generation (2014-2018 Forester)

Owners of the 2014-2018 Subaru Forester, including the 2017 model, have reported some common cooling system issues:

• Head Gasket Leaks (2.5L Engines): While less prevalent than in earlier generations, head gasket leaks can still occur on the 2.5L naturally aspirated engines. Symptoms include external oil or coolant leaks, overheating, or coolant consumption without visible external leaks.
• Radiator Leaks: Over time, the plastic end tanks of the OEM radiator can become brittle and crack, leading to coolant leaks. Inspect the top and bottom edges of the radiator for pink crusty residue or wet spots.
• Thermostat Failure: A failing thermostat can cause the engine to overheat (if stuck closed) or run too cool (if stuck open). Common signs include erratic temperature gauge readings or the engine taking a long time to warm up.
• Water Pump Leaks: The water pump can develop leaks from its weep hole as the bearing or seal wears out. You might observe a drip or puddle of coolant under the front of the vehicle, especially after it has been sitting.
• Degradation of Coolant Hoses: With age and exposure to heat, rubber hoses can harden, crack, or soften, leading to leaks. Periodically inspect all hoses for signs of wear.

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