Parts for your 2022 Subaru Xv-Thermostat housing

2022 Subaru XV thermostat housing — what it is and how to look after it

Technical sources including the Subaru Service Manual (Cooling System — FB20/FB20D, 2018–2022 XV/Crosstrek) and Subaru’s genuine parts catalogue confirm the 2022 Subaru XV is fitted with a thermostat and a dedicated housing/cover. It’s mounted on the water pump at the lower radiator hose outlet, and is sometimes listed as the thermostat “cover” or “case”.

On the 2022 XV’s FB20-series boxer engine (including e-Boxer hybrids), the thermostat housing secures and seals the thermostat, directs coolant from the radiator into the water pump, and helps manage bypass flow during warm-up. That lets the engine reach operating temperature quickly, then hold it steady under Aussie and Kiwi driving conditions. The housing is typically an alloy cover sealed with an O-ring, bolted to the front of the engine. Follow the lower radiator hose under the front of the engine bay and you’ll spot it.

As a service item, the housing doesn’t need routine replacement, but it does deserve attention whenever coolant is changed or the thermostat is replaced. Common signs it’s time to intervene include seepage around the joint, crusty dried coolant, overheating, slow warm-up, or a distorted hose connection. If the cover is cracked, pitted, or warped, replace it along with the O-ring. When swapping the thermostat, stick with the correct temperature spec and orient the jiggle pin at the top, as outlined in the factory manual.

• Clean mating faces and lightly lube the new O-ring with fresh coolant before refitting.
• Tighten the housing bolts evenly and to spec, don’t overdo it on alloy parts.
• Refill with Subaru long-life blue coolant (or equivalent meeting Subaru spec) and bleed air with the heater on. A vacuum filler makes life easier.
• After a road test, recheck the level and look for any fresh weeps around the housing and hose clamp.

There’s no fixed replacement interval for the thermostat or housing, but many techs treat a thermostat and O-ring as a preventive swap somewhere around high mileage or when any cooling work is already underway. With quality coolant and proper bleeding, the XV’s thermostat housing will generally go the distance without fuss.

Popular questions about the 2022 Subaru XV thermostat housing

Where is the thermostat housing on a 2022 Subaru XV?
It sits at the front of the engine on the water pump, right where the lower radiator hose connects. From under the bonnet, track the lower hose to an alloy cover secured by bolts — that’s the housing.

Does the thermostat housing need regular replacement?
Not usually. It’s inspected during coolant service and replaced only if it’s leaking, cracked, or corroded. The O-ring is a small, inexpensive seal and should be renewed whenever the housing is removed.

What coolant should be used after housing or thermostat work?
Use Subaru’s long-life blue coolant or an equivalent that meets Subaru specifications. Mixing types isn’t recommended. After refilling, bleed the system properly to avoid air pockets and temperature fluctuations.