Parts for your 2018 Subaru Impreza-Thermostat

Understanding the Thermostat in Your 2018 Subaru Impreza

The 2018 Subaru Impreza is fitted with a thermostat as part of its cooling system. This small but crucial component plays a vital role in regulating the engine's operating temperature, ensuring the engine warms up quickly and runs efficiently. While it might seem like a minor part, the thermostat's function can greatly impact your vehicle's performance and longevity.

The thermostat is essentially a temperature-sensitive valve located between the engine and the radiator. When the engine is cold, the thermostat remains closed, preventing coolant from flowing to the radiator. This allows the engine to reach its ideal operating temperature faster which means better fuel efficiency, reduced emissions and less engine wear caused by running cold. Once the engine hits the specified temperature, typically around 88-90 degrees Celsius for the 2018 Subaru Impreza, the thermostat opens. It then lets coolant flow through the radiator to dissipate heat and keep the engine from overheating.

Not having a thermostat would mean the coolant continuously flows through the radiator regardless of engine temperature. While this might sound okay at first, it results in the engine taking longer to warm up. Running a cold engine is far from ideal as it can lead to poor fuel burn, increased emissions and accelerated engine component wear. Subaru engineers fit thermostats to maintain an optimal balance for engine performance and environmental compliance.

Given its critical role, keeping the thermostat in good working order is an important part of maintaining your 2018 Subaru Impreza. Thermostat failure or sticking can cause overheating or the engine running too cold. Both situations impact performance and might lead to more serious engine damage if left unattended.

Here are a few reasons why the thermostat is essential and some advice on maintaining or replacing it as part of your Impreza's servicing:

• Maintains Optimal Engine Temperature
  Without the thermostat, the engine would struggle to reach optimal temperature swiftly. This prolongs cold starts, increases fuel consumption and causes higher engine wear over time.
• Prevents Overheating
  The thermostat only opens when needed, ensuring coolant flows to the radiator once the engine is hot, preventing overheating. If the thermostat sticks closed, the engine temperature can spike dangerously.
• Ensures Emission Control
  Efficient warm-up enabled by the thermostat reduces harmful emissions and helps your vehicle meet environmental standards.

Regarding maintenance, the thermostat itself does not require regular servicing or adjustment. It's a sealed mechanical device that generally performs reliably for many years. However, it's wise to have it checked if you notice symptoms such as:

• Engine overheating or running hotter than usual
• Coolant temperature gauge fluctuating erratically
• Engine taking unusually long to warm up
• Unexplained drops in fuel efficiency

Whenever your Impreza undergoes a cooling system service, especially when coolant is drained or replaced, it's a good opportunity for a technician to inspect the thermostat's function. In some cases, vehicle manufacturers recommend replacing the thermostat as part of scheduled servicing intervals, though Subaru does not specify a strict replacement interval for the thermostat in the 2018 Impreza. Instead, it's replaced on condition during diagnostic checks or if there's evidence of failure.

If replacement is needed, choosing a genuine Subaru thermostat or a high-quality aftermarket alternative guarantees proper fitment and reliability. Installation involves draining the coolant, removing the thermostat housing, swapping the thermostat, and refilling the cooling system with fresh coolant. Professional servicing ensures the system is bled of air pockets, which if left could cause erratic temperature readings or overheating.

Ignoring thermostat issues can lead to costly engine repairs down the track. Overheating can warp cylinder heads or damage the head gasket, while running too cold causes oil contamination and premature wear. That's why it pays to be proactive and have any thermostat-related concerns checked promptly by an experienced technician.

In everyday terms, think of the thermostat as your Impreza's temperature gatekeeper, opening and closing to maintain a happy medium. It's quiet and often overlooked until it's not working as it should. So, giving it a bit of attention during regular servicing helps keep your 2018 Subaru Impreza running smoothly and efficiently every kilometre of the way.