Parts for your 2020 Subaru Legacy-Thermostat housing

Understanding the Thermostat Housing on the 2020 Subaru Legacy

The 2020 Subaru Legacy features a cooling system designed to keep the engine running at the perfect temperature, and a key component of this is the thermostat housing. While some modern cars have evolved in design and parts, the thermostat housing remains an important part in the Legacy's cooling setup. This post delves into what the thermostat housing does, why it matters, and tips on taking care of it during regular maintenance.

So, does the 2020 Subaru Legacy have a thermostat housing? Yes, it does. The thermostat housing is part of the engine's cooling system that houses the thermostat - essentially a valve that regulates the flow of coolant based on temperature. This helps the engine warm up quickly and prevents it from overheating when running. Without a thermostat housing, the cooling system wouldn't be able to control the engine temperature efficiently.

Now, what exactly does the thermostat housing do? Think of it as a protective cover or casing for the thermostat. It's usually made from aluminium or a durable plastic composite and is mounted where the engine coolant exits to the radiator. The housing creates a sealed chamber for the thermostat to open and close, directing coolant flow from the engine to the radiator as needed. Because it connects hoses and sealing surfaces, it also prevents leaks in the cooling system.

On the 2020 Subaru Legacy, the thermostat housing is located on the engine block near the cylinder head. It's connected to the upper radiator hose, making it a crucial point where coolant leaves the engine and heads to be cooled by the radiator. This positioning makes it easy to access during service or repair if needed.

When it comes to maintenance, the thermostat and its housing are often overlooked, but they shouldn't be. Over time, thermostat housings can suffer damage from heat cycles, pressure, and corrosion. This can lead to leaks or even failure of the thermostat function, both of which can cause engine overheating or poor fuel economy.

There are a few signs Subaru Legacy owners can watch out for that might point to thermostat housing issues:

• Coolant leaks near the thermostat housing or upper radiator hose
• The engine temperature gauge fluctuating erratically
• Overheating engine or poor heater performance from the cabin
• Check engine light related to temperature sensors

During servicing, mechanics will routinely check the condition of the thermostat and housing, especially if there have been cooling system issues reported. Replacing the thermostat housing might be necessary if it develops cracks, leaks, or if the thermostat itself needs replacement and the housing is damaged during removal. OEM parts are usually recommended to ensure the correct fit and durability.

Here are some handy tips for caring for your 2020 Subaru Legacy's thermostat housing and cooling system:

1. Always use the recommended coolant type and mix ratio to prevent corrosion and buildup inside the system.
2. Regularly inspect hoses, clamps, and the thermostat housing for any signs of leaks or wear.
3. If replacing the thermostat, replace the sealing gasket to ensure no leaks at the housing joint.
4. When removing the thermostat housing, be gentle to avoid cracking the housing or damaging mounting surfaces.
5. Bleed the cooling system properly after any repairs to remove air pockets that can cause overheating.

Changing or maintaining the thermostat housing is generally straightforward for a professional mechanic, but for DIY enthusiasts, it's doable with the right tools and patience. It's important to ensure the engine is cool before starting to avoid burns or damage. Cleaning the mating surfaces before resealing the thermostat housing will help prevent leaks too.

Given its role and location, the thermostat housing is a subtle but vital guardian of the 2020 Subaru Legacy's engine health. Taking the time to check and maintain it properly can help your Legacy run smoothly, keep the engine temperature in check, and avoid costly overheating repairs down the track.