Parts for your 2014 Subaru Exiga-Thermostat housing

2014 Subaru Exiga Thermostat Housing: What It Does and How to Look After It

Yes, the 2014 Subaru Exiga uses a thermostat housing. Technical documentation backs this up: the Subaru YA Exiga Factory Service Manual (Cooling System section) shows the thermostat seated in the water inlet bolted to the front of the engine, and the Subaru FAST electronic parts catalogue (Group 21 – Radiator/Water Pump) lists the thermostat, gasket and water inlet (housing) for 2014 Exiga variants, including EJ20/EJ20 turbo and FB25 engines. Subaru service information (STIS) procedures also reference removing the water inlet to service the thermostat on these engines.

On this model, the thermostat housing (often called the water inlet) is the elbow-shaped piece where the lower radiator hose meets the engine. Its job is to keep the thermostat sealed and correctly positioned so coolant flow is regulated as the engine warms. Until the engine’s up to temp, the thermostat stays shut, helping it reach operating temperature quickly. Once there, it opens to let coolant circulate through the radiator, keeping things steady and preventing overheating.

For an Exiga that’s doing school runs or long Kiwi and Aussie highway stretches, a healthy housing and thermostat mean stable temps, better heater performance on chilly mornings and solid fuel economy. The housing itself is usually alloy or high-temp composite, the seal is an O-ring or gasket that doesn’t love age, heat cycles or neglected coolant.

Servicing tips owners appreciate:

• Inspection rhythm: Check around the lower radiator hose connection for crusty residue, pink/green/blue staining or dampness every 10,000–15,000 km or at each service.
• When to replace: The thermostat isn’t strictly time-based on these Subarus, but many techs replace the thermostat, O-ring and housing (if corroded or warped) during an EJ timing-belt/water-pump job. On FB25 chain-driven engines, replace on evidence of leaks, sticking, temperature swings or ageing plastics.
• Coolant choice: Refill with Subaru Super Coolant (blue) or an equivalent long-life premix compatible with Subaru aluminium engines. Always bleed air properly with the heater on HOT to avoid airlocks.
• Fitting notes: Clean the mating surface, use a new O-ring/gasket, lightly lubricate the seal with coolant, and tighten the housing bolts to the factory torque. Don’t overdo it—warped flanges and leaks are the usual penalty.

Common red flags include creeping temperatures in traffic, slow cabin heat, sudden temp spikes, or visible drips after shutdown. Sort those early and the Exiga’s cooling system will happily clock the kilometres.

Popular questions about the 2014 Subaru Exiga thermostat housing

Where is the thermostat housing on a 2014 Exiga?
It’s mounted low at the front of the engine where the lower radiator hose connects—bolted to the water pump area. On the EJ engines it’s a small alloy elbow, on the FB25 it’s a compact inlet assembly that also houses the thermostat.

Do I replace the whole housing or just the thermostat?
If the housing is corroded, pitted, cracked or warped, replace the housing and the thermostat together. If the housing face is clean and flat, a new genuine thermostat and O-ring usually does the trick. Always fit a fresh seal and new coolant.

What coolant should be used after replacement?
Use Subaru Super Coolant (blue) or an equivalent long-life premix suitable for Subaru aluminium engines. Stick with the correct spec to protect seals, alloy surfaces and the water pump, and make sure the system is properly bled of air.