Parts for your 2012 Subaru Exiga-Thermostat

2012 Subaru Exiga Thermostat

A thermostat is absolutely used on the 2012 Subaru Exiga. Technical sources including the Subaru Exiga (YA) Factory Service Manual (Cooling System – Thermostat), the Subaru FAST electronic parts catalogue, and AU/NZ application catalogues from major suppliers (e.g., Gates/Repco) all list a dedicated engine coolant thermostat for 2012 Exiga variants. The FSM specifies a wax‑pellet style thermostat located at the water pump inlet, with an opening temperature in the low‑80s °C range.

The thermostat in a 2012 Subaru Exiga is there to get the engine up to operating temp quickly, then keep it steady. By staying closed on cold starts, it helps the Exiga warm up faster, improving cabin heater performance and reducing fuel use. Once the coolant reaches roughly the low 80s °C, it starts to open and meters flow to the radiator so the engine doesn’t overheat. If it sticks open, the engine can run too cool (poor heater, higher fuel use, P0128 fault). If it sticks shut, temperatures can spike and risk head gasket damage. So, while it’s a small part, it does a big job every drive.

There’s no strict replacement interval in the service schedule, but it’s smart to check the thermostat during coolant changes and any cooling‑system work. Many owners choose to replace it proactively when doing a timing belt and water pump on EJ‑series engines, or any time the system’s drained for major service. Always use a quality OEM‑spec thermostat and a new gasket, refill with the correct Subaru‑approved coolant, and bleed air thoroughly.

• Common signs it’s due: slow warm‑up, fluctuating temp gauge, weak cabin heat, overheating under load, radiator fans running oddly, or a P0128 code.
• Good practice: fit the thermostat with the jiggle pin up, torque the housing bolts to the factory spec, and bleed the system nose‑up with the heater on.

For Aussie and Kiwi conditions—hot summers, cold alpine runs—the Exiga’s thermostat needs to be in top nick to hold that sweet operating temperature. If there’s any doubt, replacing it while the coolant’s out can save headaches later. Pair the job with fresh hoses and a new radiator cap if they’re ageing, and keep to the coolant service interval recommended in the owner’s manual to prevent scale and corrosion that can shorten thermostat life.

Where is the thermostat on a 2012 Subaru Exiga?

It’s fitted in the lower radiator hose housing at the front of the engine, right at the water pump inlet. Access is typically from underneath after draining the coolant and removing the lower hose and housing.

What temperature does it run at?

The factory thermostat begins to open in the low 80s °C and is fully open in the low 90s °C. On the dash, the gauge should sit just below the halfway mark once warmed up.

Should it be replaced as preventative maintenance?

There’s no fixed interval, but it’s a good preventative swap during a timing belt/water pump job on EJ engines, or if you’re already servicing the cooling system—especially if you’ve had any temperature or heater performance quirks.