Parts for your 2016 Subaru Legacy-Thermostat housing

Thermostat Housing on the 2016 Subaru Legacy: What It Does and How to Care for It

The 2016 Subaru Legacy is a popular mid-sized sedan known for its reliability and all-wheel-drive capability. When it comes to the cooling system of this vehicle, the thermostat and its housing are definitely part of the equation. Contrary to some modern designs that integrate the thermostat directly into the engine block or cylinder head, the 2016 Subaru Legacy features a separate thermostat housing. This makes the thermostat housing a vital component in managing the engine's operating temperature and overall cooling efficiency.

The thermostat housing on the 2016 Subaru Legacy serves a very specific but crucial role. It is essentially the casing that holds the thermostat itself. The thermostat acts as the engine's gatekeeper, controlling coolant flow between the engine and the radiator. When the engine is cold, the thermostat stays closed, allowing the engine to warm up quickly by preventing coolant from circulating to the radiator. Once the engine reaches the correct operating temperature, the thermostat opens, allowing coolant to flow and helping prevent overheating.

On the Subaru Legacy, the thermostat housing is typically attached to the engine block and connects to the upper radiator hose. This means the housing is the junction point where hot coolant exits the engine and heads to the radiator for cooling. Because the thermostat housing deals with hot coolant under pressure, it is designed from durable materials like aluminium or heavy-duty plastic to withstand heat and wear.

Given its critical function, the thermostat housing can sometimes be a source of issues, though it often flies under the radar. Over time, the housing can develop leaks due to gasket failure or cracks, especially given the heat and pressure cycling it endures. Leaks here can lead to coolant loss, engine overheating, and ultimately, potential engine damage if not addressed promptly.

Replacing or maintaining the thermostat housing during regular servicing is a smart move for any 2016 Subaru Legacy owner wanting to keep their ride in tip-top shape. Here's a closer look at why that is and what's involved.

For starters, inspecting the thermostat housing during coolant changes or any engine work is beneficial. Mechanics typically check for signs of leaks, corrosion, or damage around the housing and its gasket. If any issues are detected, it's advisable to replace the thermostat housing. It's often more cost-effective and prevents headaches down the track, especially if the vehicle is running for many more kilometres.

When fitting a new thermostat housing, ensuring a proper seal is critical. The housing connects with a gasket or O-ring designed to keep coolant sealed within the system and maintain the right pressure. If the seal isn't perfect, coolant can leak which risks overheating and damage. Subaru recommends using OEM parts for the best fit and reliability.

The actual replacement process is pretty straightforward for a skilled DIY enthusiast but usually performed by professionals during servicing. The typical steps involve draining the coolant, disconnecting the radiator hose at the thermostat housing, removing the housing bolts, and then replacing the thermostat (if needed) and the housing with a new gasket. After reassembly, the system is refilled with coolant and bled of air pockets so the engine will run efficiently without overheating.

Regularly replacing coolant and inspecting the thermostat housing can extend the life of the cooling system and engine. Coolant degradates over time, becoming less effective at heat transfer and corrosion resistance. This breakdown can accelerate damage to the thermostat housing and other cooling components.

Signs that a Subaru Legacy owner should watch out for regarding thermostat housing problems include unusual engine temperature fluctuations, coolant leaks under the car, overheating warnings, or steam coming from the engine bay. If any of these symptoms appear, having the thermostat housing and thermostat checked and replaced if necessary will save the owner from potentially costly repairs.

It's also worth noting that replacing the thermostat housing gives a good opportunity to replace the thermostat itself. Thermostats can stick open or closed after many years and kilometres, affecting engine temperature regulation and fuel efficiency. Installing a new thermostat along with the housing ensures the cooling system remains optimal.

In short, the 2016 Subaru Legacy does use a thermostat housing, and it plays a crucial role in controlling engine temperature. While not often in the spotlight, maintenance of this component is a small yet important part of overall vehicle health. Keeping an eye on leaks, ensuring gasket integrity, and periodic replacement during servicing help maintain the Legacy's reliable and smooth-running reputation.