Description
Genuine Thermostat for the 2015–2019 Subaru Outback with the 2.5L boxer 4 (FB25)
This is a new, genuine Subaru thermostat with OEM part number 21210AA260, engineered for the 2.5L boxer 4 (FB25) engine in the 2015–2019 Subaru Outback. A thermostat stuck open causes slow warm-up and poor heat; stuck closed, it overheats the engine. The genuine part opens at the factory temperature this engine’s management expects. Mason’s Auto Store sells it 31% below the manufacturer’s suggested retail price and ships it across the USA from our Battle Creek, Michigan warehouse.
Catalog fitment notes: 2.5L. Legacy, Outback.
Specifications
| Part type | Thermostat |
|---|---|
| OEM part number | 21210AA260 |
| Brand | Subaru Genuine |
| Engine | 2.5L boxer 4 (FB25) |
| Fits | 2015–2019 Subaru Outback |
| Condition | New OEM (genuine factory part) |
| Warranty | 12 months (manufacturer parts warranty) |
Will it fit my Subaru Outback?
Engine, trim, drivetrain and production date all affect the correct part number. Confirm your engine on the emissions label under the hood or from the 8th character of your VIN, compare the OEM number 21210AA260 with your old part, or add your 17-digit VIN at checkout — we verify fitment for free before shipping. Shops and fleets can send a bulk inquiry for one combined quote.
Why buy from Mason’s
- Family parts business serving drivers since 1936
- Genuine OEM part number and engine shown on every listing
- Pay by card, Afterpay, Zelle, Cash App or bank transfer — ships once payment is confirmed
- Optional shipping insurance and 30-day returns on unused parts
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