Parts for your 2002 Subaru Forester-Thermostat

2002 Subaru Forester Thermostat — Purpose, Care, and Replacement

Yes, a thermostat is absolutely fitted and relevant on the 2002 Subaru Forester. The Subaru Factory Service Manual for the 2002 model year (Cooling System section) specifies a wax‑pellet thermostat housed at the lower radiator hose/water pump inlet, and Subaru’s parts catalogue lists the thermostat and seal as standard service parts for EJ‑series engines used in this Forester. Those documents note an opening temperature around the high‑70s °C, confirming the part is integral to engine warm‑up and cooling control.

On a 2002 Forester, the thermostat’s main job is to help the engine reach operating temperature quickly, then keep it there. When the engine’s cold, the thermostat stays shut so coolant circulates within the block, warming things up faster for better fuel economy, smoother running, and less wear. As temperature rises, the thermostat gradually opens to let coolant flow through the radiator, shedding heat so the gauge stays steady even on a summer run across the Nullarbor or a winter climb in the Southern Alps.

It’s a small, hard‑working bit of kit, and when it sticks shut you’ll see overheating