Keep engine temperatures in the right window with the AISIN Engine Coolant Thermostat (THF006), a front, lower-mounted thermostat assembly that opens and closes to regulate coolant flow through the cooling system. It's a direct-fit replacement for many Subaru models, including the 2019-2025 Subaru Ascent [H4-2.4L], 2024-2025 Subaru Crosstrek [H4-2.0L], 2014-2018 Subaru Forester [H4-2.0L], 2012-2014 Subaru Impreza [H4-2.0L], 2013-2014 & 2020-2023 Subaru Legacy and Outback, 2015-2023 Subaru WRX, and 2013-2014 Subaru XV Crosstrek — see the Buyer's Guide tab for the full list of applications and engine codes.
- Materials: brass and stainless steel construction.
- Start-to-open temperature: 88°C (190.4°F) to help maintain the cooling system's operating range.
- Includes a jiggle pin check valve to help vent trapped air during coolant fill.
- Gasket/seal included; sealing flange outside diameter 56 mm, flange height 36 mm, bypass flange diameter 28 mm.
OE engineered for exact form, fit and function, this standard-design assembly restricts coolant flow when the engine is cold and opens as temperature climbs. If a thermostat stuck open (slow warm-up) or stuck closed (overheating) is the cause of your cooling trouble, this replaces it. Country of origin: Japan.
Interchange: 21210-AA200 · 21210-AA210 · 21210-AA211 · 21210-AA220 · 21210-AA221 · WV56FA-88
21210AA200 · 21210AA210 · 21210AA211 · 21210AA220 · 21210AA221 · WV56FA88
This part cross-references / interchanges with the following part numbers:
THF-006, 21210-AA200, 21210-AA210, 21210-AA211, 21210-AA220, 21210-AA221, WV56FA-88
