Thermostats

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A car thermostat plays a significant role in your engine’s health and performance because it helps regulate and monitor vehicle temperature. Are you in need of a thermostat for your vehicle? SubaruOnlineParts carries genuine OEM thermostats compatible with the Subaru Legacy, Outback, Brat, DL, GL, GL-10, Justy, Loyale, RX, Standard, and XT.

Maintaining Your Car’s Thermostat

A thermostat is a component that sits between the engine and the radiator. Its primary function is to regulate engine temperature. 

A thermostat works by opening and closing to control coolant flow depending on the engine’s temperature. When the engine is cold, a thermostat stays closed. But when the engine coolant rises in temperature—typically around 180 F/82 C—the thermostat opens, allowing the coolant to pass through the radiator.

A thermostat opens or closes depending on the state of the coolant. Having to adapt to changes in temperature could damage it, however. This could result in major engine damage if left unchecked.

There are several signs to watch out for to see if your thermostat is no longer functioning properly. If the temperature gauge has reached abnormal levels and the engine is overheating, for instance, it could be a sign that your thermostat needs replacement. On the flipside, if your car fails to heat up properly, there’s a possibility that the thermostat is stuck in its open position. 

Buy a Genuine OEM Thermostat for your Subaru Today

At SubaruOnlineParts, we offer genuine OEM thermostats for select Subaru models and model years. Our thermostats guarantee proper fitment and include a 12-month minimum manufacturer guarantee. For any questions about our products, don’t hesitate to reach out. Shop with us today.

Thermostat
Part Number: 21210AA221
Positions: Front
Other Names: Thermostat And Gasket Ay More Names
Replaces: 21210AA220
Description: WRX. 2.0L. Front. Acsent. Forester. With turbo. More Info
Fits:
  • Subaru:
    • Ascent,
    • Forester,
    • WRX
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Thermostat
Part Number: 21210AA290
Positions: Upper
Other Names: Thermostat And Gasket Ay More Names
Description: Forester. 2.5L, upper. 2.5L, thermostat. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Forester,
    • Legacy,
    • Outback
MSRP $32.50
$23.40
MSRP $32.50
$23.40
Thermostat
Part Number: 21210AA300
Description: Crosstrek. 2.0L, without hybrid. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Thermostat
Part Number: 21200KA050
Other Names: PT500289 Thermostat More Names
Replaces: 417535500
Description: Justy. All models. Without fuel injection. More Info
Fits:
  • Subaru:
    • Justy
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Thermostat
Part Number: 21210AA120
Other Names: Thermostat And Gasket Ay More Names
Description: Legacy. Outback. 2.5L without turbo, 2010-12. More Info
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Thermostat
Part Number: 21210AA260
Other Names: Thermostat And Gasket Ay More Names
Description: 2.5L. Legacy, Outback. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $32.50
$23.40
MSRP $32.50
$23.40
Thermostat
Part Number: 73540FL640
Other Names: Thms Thermo Ay More Names
Description: With hybrid. More Info
Fits:
  • Subaru:
    • Crosstrek
MSRP $47.77
$34.39
MSRP $47.77
$34.39
Thermostat
Part Number: 21200AA080
Description: Xt6. All models. XT coupe. 2.7l. More Info
Fits:
  • Subaru:
    • XT
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Thermostat
Part Number: 21200KA131
Replaces: 21200KA130
Description: Justy. With fuel injection. More Info
Fits:
  • Subaru:
    • Justy
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Thermostat
Part Number: 21210AA160
Other Names: Thermostat And Gasket Ay More Names
Description: Legacy. 2.5L with turbo. More Info
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Thermostat Unit
Part Number: 21210AA080
Other Names: Thermostat, Thermostat And Gasket Ay More Names
Description: 3.6L. Tribeca. 2008-14. 2.5L, 2006-07. Legacy/Outback. 2.5l. Legacy/Outback. 3.0l. 2.5L without turbo, 2009-10. More Info
Fits:
  • Subaru:
    • B9 Tribeca,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • Tribeca
  • 1 more
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Thermostat Cover
Part Number: 11060AA150
Other Names: Thermostat Housing, Cover Thermo More Names
Description: 2006-07. Tribeca. Legacy/Outback. 3.0l. More Info
Fits:
  • Subaru:
    • B9 Tribeca,
    • Legacy,
    • Outback
MSRP $22.85
$16.45
MSRP $22.85
$16.45
Thermostat Cover
Part Number: 11060AA390
Positions: Upper
Other Names: Thermostat Housing, Cover-Thermo More Names
Description: 2.5L, upper. 2.5L, thermostat. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Forester,
    • Legacy,
    • Outback
MSRP $17.53
$12.62
MSRP $17.53
$12.62
Thermostat Unit
Part Number: 21200AA200
Other Names: Thermostat Assembly More Names
Description: 2.5L without turbo, 2010-12. More Info
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Thermostat Housing
Part Number: 11060AA290
Positions: Upper
Other Names: Cover Thermo More Names
Description: BRZ. Upper, auto trans only. More Info
Fits:
  • Subaru:
    • BRZ
MSRP $17.53
$12.62
MSRP $17.53
$12.62
Thermostat Cover
Part Number: 11060AA360
Positions: Rear
Other Names: Thermostat Housing, Cover Thermo More Names
Description: Rear. 2.0L, without hybrid, auto trans only. More Info
Fits:
  • Subaru:
    • Ascent,
    • Crosstrek,
    • Impreza
MSRP $17.55
$12.64
MSRP $17.55
$12.64
Thermostat Gasket
Part Number: 21236AA070
Positions: Front
Other Names: Gasket, Gasket Thermo More Names
Description: WRX. Front. Acsent. Forester. Crosstrek. With turbo. 2.0L, without hybrid. More Info
Notes: 40. More Notes
Fits:
  • Subaru:
    • Ascent,
    • Crosstrek,
    • Forester,
    • Impreza,
    • WRX
MSRP $3.92
$2.82
MSRP $3.92
$2.82
Thermostat Unit
Part Number: 21200AA230
Other Names: Thermostat Assembly More Names
Description: 2.5L with turbo. More Info
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Thermostat Housing
Part Number: 417547100
Other Names: Cover Thermo More Names
Description: Brat. Hatchback. All models. More Info
Fits:
  • Subaru:
    • Brat,
    • DL,
    • GL,
    • GL-10,
    • Justy,
    • RX,
    • Standard,
    • XT
  • 3 more
MSRP $18.23
$13.13
MSRP $18.23
$13.13
Thermostat Cover
Part Number: 11060AA190
Other Names: Thermostat Housing, Cover Thermo More Names
Description: 3.6L. 2008-14. Tribeca. Legacy/Outback. More Info
Fits:
  • Subaru:
    • Legacy,
    • Outback,
    • Tribeca
MSRP $20.78
$14.96
MSRP $20.78
$14.96
Thermostat Housing
Part Number: 11060AA220
Other Names: Water Inlet, Cover Thermo More Names
Description: Legacy. 2.5L with turbo. More Info
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $33.37
$24.02
MSRP $33.37
$24.02
Thermostat Housing
Part Number: 11060AA061
Other Names: Thermostat Cover, Water Inlet, Engine Coolant Thermostat Housing, Cover Thermo More Names
Replaces: 11060AA060
Description: SVX. All. Baja. WRX STI. Forester. Impreza. 2.0l. Impreza. 2.5l. 2.5L, 2006-07. Legacy/Outback. 2.5l. 2.5L without turbo, 2010-12. More Info
Notes: 28. More Notes
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • SVX,
    • WRX STI
  • 2 more
MSRP $31.55
$22.72
MSRP $31.55
$22.72
Thermostat Housing
Part Number: 11060AA071
Other Names: Thermostat Cover, Cover-Thermo More Names
Replaces: 11060AA050, 11060AA070
Description: All. Baja. Forester. 2.5L, 2005. 2.5L, 2002-05. Manual trans. Impreza. 2.5l. 2.5L, 2006-07. Without turbo. Legacy/Outback. 2.5l. More Info
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback
MSRP $23.38
$16.84
MSRP $23.38
$16.84
Thermostat Housing
Part Number: 417545900
Other Names: Cover Thermo More Names
Description: Justy. All models. Without fuel injection. More Info
Fits:
  • Subaru:
    • Justy
MSRP $16.92
$12.18
MSRP $16.92
$12.18
Engine Coolant Thermostat
Part Number: 21210AA211
Other Names: Thermostat, Thermostat And Gasket Ay More Names
Replaces: 21210AA210
Description: Legacy. Impreza. Outback. Incl.Gasket. XV Crosstrek. Engine Cooling. 2.5L without turbo, 2013-14. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $31.67
$22.80
MSRP $31.67
$22.80
Thermostat Housing Bolt
Part Number: 21177AA000
Other Names: Engine Coolant Thermostat Housing Bolt, Bolt More Names
Description: 2.5L, 2005. More Info
Fits:
  • Subaru:
    • Baja,
    • Legacy,
    • Outback
MSRP $0.76
$0.46
MSRP $0.76
$0.46
Engine Coolant Thermostat
Part Number: 21200AA121
Other Names: Thermostat More Names
Replaces: 21200AA050, 21200AA060, 21200AA100, 21200AA120, 317534302, 417537000, 417537300
Description: Brat. Loyale. All models. XT coupe. 1.8l. XT, sedan, coupe, wagon,hatchback. More Info
Fits:
  • Subaru:
    • Brat,
    • DL,
    • GL,
    • GL-10,
    • Justy,
    • Loyale,
    • RX,
    • Standard,
    • XT
  • 4 more
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Engine Coolant Thermostat
Part Number: 21200AA170
Other Names: Thermostat, Thermostat Cover Bolt, Thermostat Assembly More Names
Description: Thermostat. 2.5L, 2006-07. Forester, Impreza. 2.5L without turbo, 2009-10. More Info
Fits:
  • Subaru:
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • Tribeca
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Engine Coolant Thermostat
Part Number: 21210AA030
Other Names: Thermostat Unit, Thermostat, Repair Kit, Thermostat And Gasket Ay More Names
Description: 3.6L. Forester. 2.5L, 2005. Thermostat. Incl.Gasket. 2.5L with turbo. 2.0L, with gasket. Legacy/Outback. 2.5l. More Info
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • WRX STI
  • 1 more
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Engine Coolant Thermostat
Part Number: 21210AA181
Positions: Lower
Other Names: Thermostat, Thermostat And Gasket Ay More Names
Replaces: 21210AA180
Description: BRZ. Lower. Forester. Incl.Gasket. Engine Cooling. No.2 ( at water pump). 2.5L without turbo, 2011-13. More Info
Fits:
  • Subaru:
    • BRZ,
    • Forester
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Engine Coolant Thermostat
Part Number: 21210AA190
Positions: Upper, Rear
Other Names: Thermostat, Temp Sensor, Thermostat And Gasket Ay More Names
Description: BRZ. Impreza. Incl.Gasket. XV Crosstrek. Transmission Cooling. Upper, auto trans only. No.1 (at rear of engine). 2.0L, without hybrid,... More Info
Notes: 11. More Notes
Fits:
  • Subaru:
    • Ascent,
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
  • 3 more
MSRP $30.40
$21.89
MSRP $30.40
$21.89
Engine Coolant Thermostat
Part Number: 21200AA072
Other Names: Thermostat More Names
Replaces: 21200AA070, 21200AA071
Notes: 73. More Notes
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • SVX,
    • WRX STI
  • 2 more
MSRP $27.50
$19.80
MSRP $27.50
$19.80
Engine Coolant Thermostat Gasket
Part Number: 21236AA100
Positions: Rear
Other Names: Gasket, Thermostat O-Ring, Thermostat Gasket, Thermostat Seal, Temp Sensor O-Ring, Gasket-Thermo More Names
Description: Rear. Impreza. 2.0L, without hybrid. Transmission Cooling. More Info
Notes: 39. More Notes
Fits:
  • Subaru:
    • Ascent,
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
  • 3 more
MSRP $3.92
$2.82
MSRP $3.92
$2.82
Engine Coolant Thermostat Housing
Part Number: 11060AA320
Other Names: Cover, Thermostat Housing, Cover Thermo More Names
Description: BRZ. Block-Off Plate. Manual trans only. Transmission Cooling. More Info
Fits:
  • Subaru:
    • BRZ
MSRP $7.37
$5.30
MSRP $7.37
$5.30
Engine Coolant Thermostat Gasket
Part Number: 21236AA090
Other Names: Gasket Thermo More Names
Description: Transmission Cooling. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Forester,
    • Impreza,
    • XV Crosstrek
MSRP $7.32
$5.27
MSRP $7.32
$5.27
Engine Coolant Thermostat Housing
Part Number: 11060AA102
Other Names: Thermostat Cover, Thermostat Housing, Cover-Thermo More Names
Description: Outback. 3.0l. More Info
Fits:
  • Subaru:
    • Outback
MSRP $28.67
$20.64
MSRP $28.67
$20.64
Engine Coolant Thermostat Housing
Part Number: 11060AA270
Other Names: Thermostat Housing, Water Inlet, Cover Thermo More Names
Description: Impreza. XV Crosstrek. Legacy, Outback. Without hybrid. Transmission Cooling. More Info
Fits:
  • Subaru:
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
  • 1 more
MSRP $17.53
$12.62
MSRP $17.53
$12.62
Engine Coolant Thermostat Gasket
Part Number: 11072AA030
Other Names: Thermo Cover Gasket More Names
Replaces: 11072AA000, 11072AA020, 817554100, 817554110, 817554120
Fits:
  • Subaru:
    • Brat,
    • DL,
    • GL,
    • GL-10,
    • Loyale,
    • RX,
    • Standard,
    • XT
  • 3 more
MSRP $3.43
$2.47
MSRP $3.43
$2.47
Engine Coolant Thermostat Housing
Part Number: 11060AA260
Positions: Lower
Other Names: Thermostat Housing, Water Inlet, Thermostat Cover, Outlet Tube, Cover Thermo More Names
Description: BRZ. Lower. Impreza. Forester. With hybrid. XV Crosstrek. Legacy, Outback. Engine Cooling. 2.5L without turbo, 2011-13. 2.5L without... More Info
Fits:
  • Subaru:
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
  • 2 more
MSRP $23.70
$17.06
MSRP $23.70
$17.06
Engine Coolant Thermostat Housing
Part Number: 11060AA380
Other Names: Cover Thermo More Names
Description: Transmission Cooling. More Info
Fits:
  • Subaru:
    • Forester
MSRP $17.53
$12.62
MSRP $17.53
$12.62
Engine Coolant Thermostat Gasket
Part Number: 11072KA000
Other Names: Thermo Cover Gasket More Names
Replaces: 317551900
Fits:
  • Subaru:
    • Justy
MSRP $8.15
$5.87
MSRP $8.15
$5.87
Engine Coolant Thermostat Housing Bolt
Part Number: 01040625A
Other Names: Thermostat Cover Bolt, Thermostat Bolt, Thermostat Housing Bolt, Cooling Pipe Bolt, Water Manifold Bolt, Water Pump Bolt, Water... More Names
Description: 3.6L. 2.0L. 2.5L, 2006-07. 2.5L, 2002-05. 2.5L without turbo, 2010-12. 2.5L without turbo, 2011-13. 2.5L without turbo, 2009-10. More Info
Fits:
  • Subaru:
    • B9 Tribeca,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • Tribeca
  • 1 more
MSRP $0.78
$0.47
MSRP $0.78
$0.47
Engine Coolant Thermostat Housing Bolt
Part Number: 808206040
Other Names: Thermostat Housing Bolt, Water Pump Bolt, Water Pipe Bolt, Water Manifold Bolt, Thermostat Cover Bolt, Engine Coolant Pipe Bolt,... More Names
Description: 2.5L. 3.6L. 2.0L, without hybrid. More Info
Fits:
  • Subaru:
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • WRX,
    • XV Crosstrek
  • 3 more
MSRP $1.68
$1.21
MSRP $1.68
$1.21
Thermostat
Part Number: 21200AA010
Replaces: 317530800, 417537100, 417537200
MSRP $22.28
$16.04
MSRP $22.28
$16.04
Thermostat
Part Number: 73071AA040
MSRP $125.47
$90.34
MSRP $125.47
$90.34
P1191094 Thermostat
Part Number: 73071AA050
MSRP $126.83
$91.32
MSRP $126.83
$91.32
Thermostat And Gasket Ay
Part Number: 21210AA200
$9,999.99
$9,999.99
Thermistor
Part Number: 73540AC100
Other Names: Thermostat Ay More Names
Fits:
  • Subaru:
    • Legacy
MSRP $64.07
$46.13
MSRP $64.07
$46.13
HVAC Evaporator Temperature Switch
Part Number: 73071AA030
Other Names: Thermostat Control More Names
Fits:
  • Subaru:
    • Legacy
MSRP $77.68
$55.93
MSRP $77.68
$55.93

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