Where is the Thermostat Located and How to Replace It on Subaru Impreza?

The thermostat located at the engine's front controls the temperature. Drain the cooling system, detach the thermostat housing cover, and check the thermostat's installation. Then, clean the housing and cover surfaces, install a new seal and thermostat, and secure the bolts to the proper torque specifications.

Genuine Subaru Impreza Thermostat

Engine Coolant Thermostat

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21 Thermostats found

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Subaru Impreza THERMOSTAT Gasket Assembly
Part Number: 21210AA030
$19.67 MSRP: $28.50
You Save: $8.83 (31%)
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Product Specifications
- Other Name: Thermo And Gasket Assembly; Repair Kit, Thermostat, Thermostat Unit
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2011 Subaru Impreza | 2.5 GT, Outback, RS, STI, STI Limited, STI Special Edition, STI Sport, TS, WRX, WRX Sport, WRX TR, WRXSS | 2.0L H4 Turbo, 2.5L H4, 2.5L H4 Turbo
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Subaru Impreza Thermostat
Part Number: 21200AA072
$22.60 MSRP: $32.75
You Save: $10.15 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermo Assembly
- Replaces: 21200AA071, 21200AA070
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1993-2011 Subaru Impreza | 2.5 GT, Base, Brighton, L, L+, LE, LS, LX, Outback, RS, STI, STI Limited, STI Special Edition, STI Sport, TS, WRX, WRX Sport, WRX TR, WRXSS | 1.8L H4, 2.0L H4 Turbo, 2.2L H4, 2.2L H4 (New EVAPO), 2.2L H4 Series, 2.5L H4, 2.5L H4 DOHC, 2.5L H4 SOHC, 2.5L H4 Turbo
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Subaru Impreza THERMOSTAT Gasket Assembly
Part Number: 21210AA080
$18.40 MSRP: $26.67
You Save: $8.27 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo And Gasket Assembly; Thermostat, Thermostat Unit
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2011 Subaru Impreza | 2.5i, 25i, Outback, Outback Sport | 2.5L H4
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Subaru Impreza THERMO & Gasket Assembly
Part Number: 21210AA260
$27.21 MSRP: $39.43
You Save: $12.22 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermo And Gasket Assembly; Thermostat
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2015-2016 Subaru Impreza | Base, Limited, Premium, Sport, Sport Limited
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Subaru Impreza THERMOSTAT Gasket Assembly
Part Number: 21210AA190
$23.12 MSRP: $33.50
You Save: $10.38 (31%)
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Product Specifications
- Other Name: Thermo And Gasket Assembly; Thermostat
- Replaced by: 21210AA191
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2012-2021 Subaru Impreza | Base, Limited, Premium, Sport, Sport Limited
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Subaru Impreza THERMO And Gasket Assembly
Part Number: 21210AA211
$24.44 MSRP: $35.42
You Save: $10.98 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat
- Replaces: 21210AA210
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2012-2014 Subaru Impreza | Base, Limited, Premium, Sport, Sport Limited
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Subaru Impreza THERMO And Gasket Assembly
Part Number: 21210AA221
$27.21 MSRP: $39.43
You Save: $12.22 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat
- Replaces: 21210AA220
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2024-2025 Subaru Impreza | 4 Cyl 2.0L
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Subaru Impreza THMS THERMO Assembly
Part Number: 73540FG011
$39.79 MSRP: $57.67
You Save: $17.88 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat-Cooling; Refrigerant Temp Sensor, Temp Sensor
- Replaces: 73540FG010
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2016 Subaru Impreza | 2.5 GT, 2.5i, Limited, Premium, Sport Limited, STI, STI Sport, WRX, WRX Sport, WRXSS | 2.5L H4, 2.5L H4 Turbo
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Subaru Impreza THERMOSTAT Gasket Assembly
Part Number: 21210AA210
$24.44 MSRP: $35.42
You Save: $10.98 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo And Gasket Assembly
- Replaced by: 21210AA211
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2012-2014 Subaru Impreza | Base, Limited, Premium, Sport, Sport Limited
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Subaru Impreza THERMOSTAT Assembly
Part Number: 21200AA170
$17.25 MSRP: $25.00
You Save: $7.75 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermo Assembly; Thermostat, Thermostat Cover Bolt
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2011 Subaru Impreza | 2.5i, 25i, Outback, Outback Sport | 2.5L H4
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Subaru Impreza THERMOSTAT Cooling
Part Number: 73540FG000
$41.80 MSRP: $60.58
You Save: $18.78 (31%)
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Product Specifications
- Other Name: Thermostat-Cooling
- Manufacturer Note: ZXL/582552-1720
- Replaced by: 73540FJ000
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2011 Subaru Impreza | 2.5i, Outback Sport, STI, STI Special Edition | 2.5L H4, 2.5L H4 Turbo
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Subaru Impreza A/C Evaporator Temperature Sensor
Part Number: 73540FJ000
$41.80 MSRP: $60.58
You Save: $18.78 (31%)
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Product Specifications
- Other Name: HVAC Evaporator Temperature Switch; Temp Sensor
- Replaces: 73540FG001, 73540FG000
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2016 Subaru Impreza | 2.5i, Base, Outback Sport, Premium, Sport, STI, STI Special Edition | 2.5L H4, 2.5L H4 Turbo
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Subaru Impreza THERMOSTAT Cooling
Part Number: 73540FG010
$39.79 MSRP: $57.67
You Save: $17.88 (31%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat-Cooling
- Manufacturer Note: ZXL/582624-6520
- Replaced by: 73540FG011
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2011 Subaru Impreza | 2.5 GT, 2.5i, STI, STI Sport, WRX, WRX Sport, WRXSS | 2.5L H4, 2.5L H4 Turbo
View related parts
Subaru Impreza Thermostat
Part Number: 21200AA071
$22.60 MSRP: $32.75
You Save: $10.15 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo Assembly
- Replaced by: 21200AA072
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1993-1995 Subaru Impreza | Base, L, L+, LE, LS, LX | 1.8L H4, 2.2L H4
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Subaru Impreza THERMO & GSKT AY
Part Number: 21210AA191
$23.12 MSRP: $33.50
You Save: $10.38 (31%)
ADD TO CART
Product Specifications
- Replaces: 21210AA190
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2022-2025 Subaru Impreza | 4 Cyl 2.0L, 4 Cyl 2.0L CVT
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Subaru Impreza Thermostat
Part Number: 21210AA300
$25.88 MSRP: $37.50
You Save: $11.62 (31%)
ADD TO CART
Product Specifications
- Other Name: Thermo And Gasket Assembly
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2017-2021 Subaru Impreza | Base, Limited, Premium, Sport
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Subaru Impreza THERMO & GSKT AY
Part Number: 21210AA291
$27.21 MSRP: $39.43
You Save: $12.22 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaces: 21210AA290
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2024-2025 Subaru Impreza | 4 Cyl 2.5L
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Subaru Impreza THMS THERMO Assembly
Part Number: 73540FL00A
$7.24 MSRP: $10.05
You Save: $2.81 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat-Cooling
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2017-2021 Subaru Impreza | Base, Limited, Premium, Sport
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Subaru Impreza THMS THERMO Assembly
Part Number: 73540FL650
$39.33 MSRP: $57.00
You Save: $17.67 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2024 Subaru Impreza | 4 Cyl 2.0L, 4 Cyl 2.5L
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Subaru Impreza THMS THERMO Ay
Part Number: 73540FL640
$39.33 MSRP: $57.00
You Save: $17.67 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2024-2025 Subaru Impreza | 4 Cyl 2.0L, 4 Cyl 2.5L

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Subaru Impreza Thermostat

The Subaru Impreza Thermostat manages the flow of coolant to the engine, controlling its temperature. The Thermostat is a closed loop device that is located beside the radiator and senses the coolant heat, reacting to maintain the setpoint. Inside the housing, a wax pellet expands when heated. This expansion opens the Thermostat valve so hot coolant can flow to the radiator. The wax pellet contracts as the coolant passes through and cools. This contraction allows the valve to close and restrict the flow of coolant, preventing the engine from over-cooling. Through its cycling open and closed operations, the Thermostat guarantees that conditions for combustion stay efficient. It also keeps emissions under control while making sure cabin heaters receive consistent warmth. The Subaru engine should not become too hot or too cold for proper function. A critical aspect of the Subaru cooling system is coolant temperature. Every Impreza uses this simple mechanical process for confidence in daily use, and the same method is applied whether the Impreza is stuck in traffic or climbing hills. The Thermostat does not have any electronic parameters to set, which means it will work automatically to provide the right protection for every Impreza powerplant while enhancing the greater Subaru durability.

Our website stands as the go-to online destination for OEM Subaru Impreza Thermostat. With complete lines of genuine Subaru Impreza Thermostat available at unbeatable market prices, we ensure top quality, reliability, and durability. Each part comes backed by the manufacturer's warranty, reinforcing your trust in our offerings.

Subaru Impreza Thermostat Parts Questions & Experts Answers

THMS THERMO Assembly
73540FG011
Q: Where is the Thermostat Located and How to Replace It on Subaru Impreza?
A:
The thermostat located at the engine's front controls the temperature. Drain the cooling system, detach the thermostat housing cover, and check the thermostat's installation. Then, clean the housing and cover surfaces, install a new seal and thermostat, and secure the bolts to the proper torque specifications.