Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I, ENG CD FB25BA, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE COOLING SYSTEM (H4DOTC))THERMOSTATINSPECTION
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard Trans
Section 5 (Engine Cooling System (H4DOTC)): Thermostat: Inspection
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Inspection
WARNING: This page is about a different variant/trim than selected.
- Check that the thermostat does not have deformation, cracks or damage.
- Check that the thermostat valve closes completely at an ambient temperature.
- Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and check the temperature and valve lift when the valve begins to open and when the valve is fully opened. Replace the thermostat if faulty.NOTE:
- During the test, agitate the water for even temperature distribution.
- Leave the thermostat in the boiling water for five minutes or more before measuring the valve lift.
- Hold the thermostat with a wire or the like to avoid contacting with container bottom.
Starting temperature to open:
86 - 90°C (187 - 194°F)
Full open temperature:
95°C (203°F)
Total valve lift:
8.0 mm (0.315 in) or more
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.