Parts for your 2018 Subaru Legacy-Thermostat

Thermostat Guide for the 2018 Subaru Legacy

For owners of the 2018 Subaru Legacy, understanding the role of the thermostat in their vehicle is a handy bit of knowledge that can go a long way in keeping the car running smoothly. The 2018 Subaru Legacy does indeed come fitted with a thermostat as part of its engine cooling system. This component plays a crucial role in helping the engine reach and maintain the correct operating temperature. If you're wondering what the thermostat does, why it matters, and how to look after it, this guide covers all of that and more.

Simply put, the thermostat is a small valve located between the engine and the radiator. Its job is to regulate the amount of coolant flowing through the engine and radiator depending on the engine temperature. When you first start your 2018 Legacy, the engine temperature is low and the thermostat stays closed, preventing coolant from flowing to the radiator. This allows the engine to warm up quickly, which is essential for efficient performance and reduced emissions.

Once the engine reaches its optimal temperature, usually around 85 to 95 degrees Celsius, the thermostat gradually opens. This lets coolant flow through the radiator, where it's cooled down before circulating back through the engine. By continually adjusting this flow, the thermostat keeps the engine from running too hot or too cold, which can both cause problems. Running too hot can lead to overheating and serious engine damage, while being too cold can reduce fuel efficiency and increase wear on engine components.

Given how critical the thermostat is in the cooling system, it definitely pays to keep an eye on its health as part of regular vehicle servicing. Thermostats can fail in a few ways. Sometimes, they get stuck closed, which means coolant can't flow to the radiator and the engine overheats quickly. Other times, they get stuck open, causing the engine to run cooler than it should. This can lead to poor fuel economy and rough engine performance. More commonly, thermostats can become sluggish, meaning they don't open or close at the right temperature, upsetting the balance in the cooling system.

For the 2018 Subaru Legacy, the thermostat is a durable part but not one you can simply forget about. Many mechanics recommend checking or replacing the thermostat as part of a major service interval, or when the cooling system is being serviced - such as a coolant flush. Keeping the thermostat in top shape helps avoid unexpected overheating and costly engine repairs down the line.

When it comes to replacing or maintaining the thermostat, here are some handy tips for your Subaru Legacy:

1. Watch out for warning signs like the temperature gauge reading unusually high or low, the engine taking longer than usual to warm up, or unusual heater performance inside the cabin.
2. If the cooling fan runs more than usual or you notice coolant leaks near the thermostat housing, get it checked sooner rather than later.
3. During routine maintenance, always ask your mechanic to inspect the thermostat and cooling system hoses for any signs of wear or corrosion.
4. When replacing the thermostat, it's a good idea to also replace the thermostat gasket to prevent leaks and ensure a proper seal.
5. Always use the correct thermostat specified for the 2018 Subaru Legacy engine to guarantee optimal performance. Using an incorrect or generic part might lead to temperature regulation issues.

It's worth noting that routine coolant replacement or flushing plays a key role in maintaining thermostat performance. Old, dirty, or contaminated coolant can cause the thermostat to stick or malfunction. Following Subaru's recommended coolant change intervals keeps the entire cooling system - including the thermostat - in good nick.

In short, while the thermostat might be a small and often overlooked part under the bonnet, it's pretty vital for keeping the 2018 Subaru Legacy's engine running at the right temperature. Taking the time to inspect and maintain the thermostat as part of your car's regular servicing really helps ensure a smooth, efficient drive season after season.

If any temperature troubles pop up, don't delay getting it checked. A faulty thermostat can sometimes cause the overheating light to come on or even create some engine warning lights on your dash. Early detection helps avoid more expensive repairs and keeps your Subaru running just as it should.

So, whether you're a seasoned driver or just getting to know your Subaru Legacy, it pays to remember there's a little valve called the thermostat quietly doing heaps of important work every time you hit the road.