Parts for your 2007 Subaru Impreza-Thermostat

Thermostat for the 2007 Subaru Impreza: What You Need to Know

If you own a 2007 Subaru Impreza, whether it's a hatchback or a sedan, you might be wondering whether this car has a thermostat, and what role it plays. Well, the answer is yes, the 2007 Subaru Impreza does have a thermostat fitted as part of its cooling system. It's definitely not a case where the car lacks one, on the contrary, the thermostat is a crucial component in managing engine temperature.

So why exactly does the 2007 Subaru Impreza have a thermostat? The thermostat's main job is to regulate the engine's operating temperature by controlling the flow of coolant between the engine and radiator. When you start the engine cold, the thermostat stays closed, preventing coolant from flowing through the radiator. This allows the engine to heat up more quickly to its optimal operating temperature. Once the engine hits the desired temperature, the thermostat opens up and lets the coolant circulate freely, helping to keep the engine cool and prevent overheating.

Thermostats are pretty much standard in nearly all modern internal combustion engine vehicles, and the 2007 Impreza uses one because it helps improve engine efficiency, reduce emissions, and protect the engine from damage caused by overheating.

Now, for Impreza drivers who want to keep their car running smoothly, looking after the thermostat should be part of regular maintenance. If the thermostat fails, it can get stuck open or closed, which causes some common issues. For instance, a thermostat stuck open means the engine takes longer to warm up, which can reduce fuel economy and increase wear on engine components. On the other hand, a thermostat stuck closed can cause the engine to overheat quickly, which is even more dangerous and can lead to serious engine damage.

Replacing the thermostat on your 2007 Subaru Impreza isn't overly complicated, but it's definitely something you want to do right if you're servicing the cooling system. Here's what owners or mechanics usually keep in mind:

• Cool the engine first. Never attempt to remove a thermostat from a hot engine. The cooling system is pressurised and hot coolant can spray out and cause burns.
• Drain the coolant. Draining the radiator partially or fully is necessary so you can replace the thermostat without a mess. Some people catch and reuse coolant if it's still in good shape.
• Locate the thermostat housing. On the Subaru Impreza, the thermostat is housed in the coolant outlet on the engine. It's usually accessible with some basic hand tools, but exact placement might vary slightly depending on the engine variant, like the 2.0L boxer engine.
• Replace the thermostat and gasket. When fitting a new thermostat, it's good practice to also replace the gasket or seal to prevent leaks. Make sure to install the thermostat with the right orientation, typically the spring side faces the engine.
• Refill the cooling system and bleed air. After replacement, refill the coolant and bleed any air trapped inside the system to ensure proper operation. Air pockets can cause overheating or erratic temperature readings.
• Check for leaks and test. After reassembling, start the engine and keep an eye on temperature gauge and for any leaks. The engine temperature should rise smoothly and stabilise once the thermostat opens.

Regular checking of the thermostat might not be high on every owner's list, but it's a good idea, especially if the temperature gauge is acting strangely, the heater inside the car isn't blowing warm air, or if the engine warms up very slowly or overheats. Thermostats don't last forever. While some can run reliably for many years, exposure to coolant contamination, corrosion or mechanical wear can cause them to fail.

Many mechanics recommend changing the thermostat as part of routine cooling system maintenance, which often aligns with radiator flushes and coolant replacements. For a 2007 Subaru Impreza that's approaching 150,000 to 200,000 kilometres, having the thermostat checked or replaced isn't a bad call, especially if the vehicle is used in varied Australian climates from hot summers to cold winters.

In summary, the thermostat in your 2007 Subaru Impreza plays a vital role in making sure that engine temperature stays within the right range. Keeping this part in good health helps the engine run efficiently, reduces unnecessary wear, and avoids potentially costly overheating repairs. Whether you're a DIY enthusiast or leaving the job to a mechanic, keeping an eye on the thermostat during your car's servicing schedule is a smart way to look after your Subaru and keep those drives smooth and worry-free.