Order Subaru Engine thermostat. Browse Subaru Thermostat & Subaru Coolant thermostat replacement. Find Subaru Thermostat replacement. Maintaining the thermostat in your Subaru is crucial for engine health, as it regulates operating temperature, ensuring peak performance and fuel efficiency. To extend its lifespan, regularly check coolant levels and schedule cooling system flushes. Signs you may need a replacement include fluctuating temperatures, overheating, or poor cabin heating. When selecting a new thermostat, opt for OEM-quality options designed for durability and precise fit, such as low-temp racing thermostats or standard replacements that match your Subaru's specifications. For a hassle-free installation, ensure the gasket surface is clean and the unit is correctly oriented. A well-chosen and maintained thermostat not only improves reliability but also supports your Subaru's longevity, so shop with confidence from our curated selection of top-tier thermostats.