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

The thermostat controls the engine's temperature. If working correctly, the temperature gauge should quickly reach the normal temperature. To replace, begin by lifting the vehicle's front, draining the cooling system, and placing a drain pan under the thermostat housing. Remove the housing cover. Note the thermostat's position then remove it. Clean the thermostat housing and cover and install a new seal. Place the thermostat correctly then position the housing cover correctly and screw the bolts. Reattach the radiator hose and fill the radiator up with coolant, then start the engine. Check for leaks.

Genuine Subaru Legacy Thermostat

Engine Coolant Thermostat

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24 Thermostats found

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Subaru Legacy THERMOSTAT
Part Number: 21200AA072
$23.58 MSRP: $32.75
You Save: $9.17 (28%)
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:
- 2015-2019 Subaru Legacy | 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 3.6L H6
- 1990-2004 Subaru Legacy | Baja, Baja-B, Baja-S, Base, Brighton, Cold Weather, Flat6, Flat6 L.L.Bean, Flat6-S, GT, L, L-S, LS, LS-D, LS-I, Limited, Out Back, Post, SUS, SUS Flat6, SUS Limited, Turbo | 2.2L H4, 2.2L H4 (New EVAPO), 2.2L H4 Series, 2.5L H4, 2.5L H4 Turbo, 3.0L H6
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Subaru Legacy THERMOSTAT Gasket Assembly
Part Number: 21210AA080
$25.50 MSRP: $35.42
You Save: $9.92 (29%)
Ships in 1-3 Business Days
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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:
- 2005-2014 Subaru Legacy | 2.5i, 2.5i Base, 2.5i Limited, 3.0R, 3.0R Limited, 3.0R LL-Bean, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring, Base | 2.5L H4, 3.0L H6, 3.6L H6
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Subaru Legacy THERMOSTAT Gasket Assembly
Part Number: 21210AA190
$28.39 MSRP: $39.43
You Save: $11.04 (28%)
ADD TO CART
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:
- 2015-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.4L H4 DIT, 2.5L H4
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Subaru Legacy THERMO & Gasket Assembly
Part Number: 21210AA260
$41.94 MSRP: $58.25
You Save: $16.31 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo And Gasket Assembly; Thermostat
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2015-2019 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4
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Subaru Legacy THERMOSTAT Gasket Assembly
Part Number: 21210AA120
$24.30 MSRP: $33.75
You Save: $9.45 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo And Gasket Assembly; Thermostat
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium | 2.5L H4 SOHC
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Subaru Legacy THERMOSTAT Assembly
Part Number: 21200AA170
$22.14 MSRP: $30.75
You Save: $8.61 (28%)
Ships in 1-3 Business Days
ADD TO CART
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:
- 2010-2014 Subaru Legacy | 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 3.6L H6
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Subaru Legacy THERMO And Gasket Assembly
Part Number: 21210AA221
$28.39 MSRP: $39.43
You Save: $11.04 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat
- Replaces: 21210AA220
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2020-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring | 2.4L H4 DIT
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Subaru Legacy THERMO And Gasket Assembly
Part Number: 21210AA211
$30.60 MSRP: $42.50
You Save: $11.90 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat
- Replaces: 21210AA210
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2013-2014 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4 DOHC
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Subaru Legacy THERMOSTAT Gasket Assembly
Part Number: 21210AA210
$30.60 MSRP: $42.50
You Save: $11.90 (28%)
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:
- 2013-2014 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4 DOHC
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Subaru Legacy THERMOSTAT Assembly
Part Number: 21200AA200
$21.44 MSRP: $29.78
You Save: $8.34 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo Assembly; Thermostat Unit
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium | 2.5L H4 SOHC
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Subaru Legacy THERMOSTAT Gasket Assembly
Part Number: 21210AA160
$29.16 MSRP: $40.50
You Save: $11.34 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo And Gasket Assembly; Thermostat
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5GT Limited, 2.5GT Premium | 2.5L H4 Turbo
View related parts
Subaru Legacy THERMOSTAT
Part Number: 21200AA071
$23.58 MSRP: $32.75
You Save: $9.17 (28%)
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:
- 1990-1995 Subaru Legacy | Base, Brighton, L, LS, LS-D, Post, Turbo | 2.2L H4
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Subaru Legacy THERMO & GSKT Ay
Part Number: 21210AA290
$31.55 MSRP: $43.82
You Save: $12.27 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaced by: 21210AA291
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2020-2021 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4 DI
View related parts
Subaru Legacy THERMOSTAT
Part Number: 21200AA070
$23.58 MSRP: $32.75
You Save: $9.17 (28%)
Ships in 1 Business Day
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:
- 1990 Subaru Legacy | Base, L, LS, LS-D
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Subaru Legacy THMS THERMO Assembly
Part Number: 73540AN01A
$37.54 MSRP: $52.13
You Save: $14.59 (28%)
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:
- 2020-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.4L H4 DIT, 2.5L H4 DI
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Subaru Legacy THMS THERMO Assembly Eva
Part Number: 73540AN00A
$14.00 MSRP: $19.45
You Save: $5.45 (29%)
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:
- 2020-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.4L H4 DIT, 2.5L H4 DI
View related parts
Subaru Legacy THMS THERMO Assembly
Part Number: 73540AJ01A
$145.01 MSRP: $203.10
You Save: $58.09 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat-Cooling; Thermistor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2019 Subaru Legacy | 2.5GT Limited, 2.5GT Premium, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 2.5L H4, 2.5L H4 DOHC, 2.5L H4 SOHC, 2.5L H4 Turbo, 3.6L H6
View related parts
Subaru Legacy THERMOSTAT Assembly
Part Number: 21200AA230
$23.78 MSRP: $33.03
You Save: $9.25 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermo Assembly; Thermostat Unit
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5GT Limited, 2.5GT Premium | 2.5L H4 Turbo
View related parts
Subaru Legacy P1031096 THERMOSTAT
Part Number: 73071AA000
Product Specifications
- Other Name: Thermostat-Cooling
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1995-1996 Subaru Legacy | Post | 2.2L H4 , 2.2L H4 (New EVAPO)
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Subaru Legacy THERMOSTAT Control
Part Number: 73071AA030
Product Specifications
- Other Name: Thermostat-Cooling
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1990-1993 Subaru Legacy | L, LS, LS-D, Turbo

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Subaru Legacy Thermostat

The Thermostat is one of the vital parts of the cooling system; it is installed near the radiator of Subaru Legacy vehicles. It serves mainly to control the temperature of the engine to a desired level that is efficient for its operation. The thermostat is practically a closed loop control instrument which is capable of ascertaining the direction and volume of the coolant in order to attain and sustain a certain temperature. Subaru Legacy models in the years utilized various types of thermostats that can be either mechanical such as bimetallic strip and wax pellet thermostat. These mechanical thermostats work in such a way that they open or close depending on the changes in temperatures for engine management. There has also been development in the kind of thermostats, where pneumatic types, which employ air-filled tubes for the regulation have added more efficiency in the general control of temperature in the car.

Our website stands as the go-to online destination for OEM Subaru Legacy Thermostat. With complete lines of genuine Subaru Legacy 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 Legacy Thermostat Parts Questions & Experts Answers

THERMOSTAT
21200AA072
Q: Where is the Thermostat Located and How to Replace It on Subaru Legacy?
A: The thermostat controls the engine's temperature. If working correctly, the temperature gauge should quickly reach the normal temperature. To replace, begin by lifting the vehicle's front, draining the cooling system, and placing a drain pan under the thermostat housing. Remove the housing cover. Note the thermostat's position then remove it. Clean the thermostat housing and cover and install a new seal. Place the thermostat correctly then position the housing cover correctly and screw the bolts. Reattach the radiator hose and fill the radiator up with coolant, then start the engine. Check for leaks.