Parts for your 2018 Subaru Forester-Thermostat

Thermostat on the 2018 Subaru Forester: What You Need to Know

The 2018 Subaru Forester definitely comes equipped with a thermostat as part of its cooling system. Like most modern cars, Subaru uses a thermostat to regulate the engine temperature, ensuring it operates efficiently and reliably under various driving conditions. If you're a Forester owner or just curious about how your vehicle's cooling system works, understanding the thermostat's role and maintenance needs can help keep your car running smoothly for years to come.

So, what exactly does a thermostat do? Think of the thermostat as the gatekeeper of the engine's cooling system. It sits between the engine and the radiator and controls coolant flow based on engine temperature. When you start your Forester cold, the thermostat remains closed initially. This traps coolant in the engine block so it can heat up quicker. Getting the engine to its ideal operating temperature fast helps improve fuel efficiency, reduces emissions, and enhances overall performance.

As the engine warms up and reaches a specific temperature - generally around 87 to 95 degrees Celsius - the thermostat opens gradually. This allows coolant to circulate through the radiator and cool down before cycling back to the engine. By controlling this flow, the thermostat prevents the engine from overheating or running too cold. An engine that runs too cool can waste fuel and increase engine wear, while an overheating engine risks serious damage.

In the 2018 Subaru Forester, the thermostat plays a crucial role especially considering its Boxer engine design and the all-wheel-drive setup. Since Subaru engines are known for their flat layout, coolant flow and thermal management must be precise, and the thermostat helps maintain that balance. Whether you're driving on a hot summer day in Brisbane or cruising through chilly winter mornings in Tasmania, the thermostat ensures your Forester's engine temperature stays just right.

Over time, like any mechanical part, a thermostat can wear out or malfunction. Common issues include sticking in the open or closed position. If the thermostat gets stuck open, the engine can take forever to warm up, causing poor fuel economy and reduced heater performance. If it sticks closed, the engine could rapidly overheat, potentially leading to blown head gaskets or other costly repairs.

Because of its important function, checking the thermostat during routine servicing is a smart move. Subaru dealerships and trusted mechanics often inspect the thermostat as part of coolant system checks. If your Forester is due for a coolant flush or radiator service, it makes sense to take a close look at the thermostat and replace it if there's any sign of wear or failure. It's a relatively inexpensive part, but skipping replacement when needed can lead to expensive engine damage down the track.

Here are some common signs your Forester's thermostat might need attention:

• Engine temperature gauge fluctuates wildly or stays unusually low
• Heater inside the cabin isn't getting warm - even when the engine is running long enough
• Coolant leaks around the thermostat housing
• Engine overheats without obvious cause or warning lights come on

If any of these symptoms appear, getting the thermostat tested or replaced is definitely worth it. Most mechanics will drain some coolant, remove the thermostat housing, and either test the thermostat in hot water or simply replace it as a preventative measure. Replacing the thermostat is generally straightforward and won't take more than an hour or two in a workshop.

Maintenance wise, always keep an eye on your vehicle's cooling system. Follow Subaru's recommended service intervals for coolant replacement, which helps prevent corrosion and blockages that can affect the thermostat's operation. Using the correct type of coolant, as specified by Subaru, is also crucial for the longevity of all cooling system components, including the thermostat.

It's also worth noting that the thermostat itself does not typically require any direct servicing apart from replacement. It doesn't have moving parts that need lubrication or adjustment. Instead, it relies on a temperature-sensitive wax pellet or similar mechanism to open and close at certain temperatures. Over time, deposits or mechanical fatigue can impair this function, which is why diagnostics and replacement when necessary are key.

For Forester owners doing their own maintenance, replacing the thermostat can be a satisfying DIY task if you have basic mechanical skills. Getting a high-quality genuine Subaru thermostat or a reputable aftermarket equivalent ensures that the part will perform reliably under the demanding conditions Subaru engines face.

Ultimately, the thermostat may be a small part, but it has a big job to do in your 2018 Subaru Forester. Keeping it in good working order ensures your engine reaches and maintains the perfect temperature range for smooth, efficient, and safe operation. Whether servicing at your Subaru dealer or trusted local mechanic, thermostat checks and replacements are an important part of looking after your Forester's heart and soul - the engine.