Parts for your 2020 Subaru Outback-Thermostat housing

2020 Subaru Outback thermostat housing

According to Subaru’s 2020 Outback (BT) service manual cooling-system sections for the FB25/FA24 engines and the Subaru Global/FAST parts catalogue, this model absolutely uses a thermostat and a dedicated housing. On these boxer engines, the thermostat sits low at the front of the engine, integrated into the water pump cover and connected to the lower radiator hose. That means a thermostat-housing is relevant and fitted on the 2020 Subaru Outback.

This housing’s job is simple but critical: it locates and seals the thermostat, directs coolant flow between the engine and radiator, and provides a solid, leak-free junction for the lower hose. When the engine is cold, the thermostat stays shut so the Outback warms up quickly. Once it’s at operating temperature, the thermostat opens and the housing channels hot coolant to the radiator. If the housing or its seal fails, coolant leaks and temperature control go out the window.

As part of routine servicing, it’s smart to give the thermostat-housing and the surrounding area a once-over. Look for dry pink or white residue, dampness, or crusting at the housing joint and lower hose clamp. Subaru specifies a long-life blue coolant