Subaru Thermostats

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What does the factory thermostat in a Subaru do? More importantly, how does it work? The short answer is that it helps keep your engine from overheating. However, it's less obvious how a cooling system valve can achieve this. Yes, how your original Subaru thermostat works is simple: it opens and closes, often thanks to a spring or piston, and this keeps coolant circulating through your engine and radiator the way it's supposed to. However, it's precise timing that's key. After all, coolant must stay at the right temperature, whether it's warm or cold out. It all comes together, thanks to many auto parts working in sync. Is your temperature gauge giving constant readings, centered or just slightly cold? Then it's working normally. Thankfully, thermostats don't usually go bad with age either, so when to replace a car thermostat isn't usually something you have to worry about. However, that doesn't mean a thermostat can't fail. There are signs your thermostat isn't working right. They include a Check Engine light, improper valve opening and closure, and a stuck valve. These issues usually appear as engine and AC and heating problems. A malfunctioning valve can't move coolant correctly, and this can either cause an overheat or keep coolant from reaching the correct temperature. Engine efficiency can tank, and your HVAC system can stop heating right. Nearby auto parts, like the surrounding hoses and gaskets, can even warp, if they don't immediately malfunction, too. In any of these cases, do an inspection. If you need to replace your car thermostat, do it with a genuine Subaru thermostat. You can order one online at low cost from our auto parts counter. Buy today and enjoy peace of mind.

Thermostat
Part Number: 21210AA221
Options: Front
Other Names: Thermostat And Gasket Ay
Replaces: 21210AA220
Description: WRX. 2.0L. Front. Ascent. Forester. With turbo.
Notes: Includes Gasket. Part has related components that cannot be reused/reinstalled. gasket.
Fits:
  • Subaru:
    • Ascent,
    • Forester,
    • WRX
MSRP $39.43
$26.97
MSRP $39.43
$26.97
Thermostat
Part Number: 21210AA160
Other Names: Thermostat And Gasket Ay
Description: Legacy. With turbo.
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $40.50
$27.70
MSRP $40.50
$27.70
Thermostat
Part Number: 21210AA120
Other Names: Thermostat And Gasket Ay
Description: Legacy. Without turbo. Outback.
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $33.75
$23.09
MSRP $33.75
$23.09
Thermostat
Part Number: 21210AA181
Options: Lower
Other Names: Thermostat And Gasket Ay
Replaces: 21210AA180
Description: Forester. Lower. BRZ. No.2 (at water pump). 2.5L without turbo, 2011-13.
Notes: Includes Gasket.
Fits:
  • Subaru:
    • BRZ,
    • Forester
MSRP $33.25
$23.14
MSRP $33.25
$23.14
Thermostat
Part Number: 21210AA260
Other Names: Thermostat And Gasket Ay
Description: 2.5L. Legacy, Outback. XV Crosstrek, Crosstrek.
Notes: Includes Gasket.
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $58.25
$39.84
MSRP $58.25
$39.84
Thermostat Cover
Part Number: 11060aa150
Other Names: Thermostat Housing, Cover Thermo
Description: Legacy/Outback. 3.0l. 2006-07. Tribeca.
Fits:
  • Subaru:
    • B9 Tribeca,
    • Legacy,
    • Outback
MSRP $27.98
$19.48
MSRP $27.98
$19.48
Thermostat Unit
Part Number: 21200AA200
Other Names: Thermostat Assembly
Description: 2.5L without turbo, 2010-12.
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $29.78
$20.73
MSRP $29.78
$20.73
Thermostat Housing
Part Number: 11060AA061
Other Names: Thermostat Cover, Water Inlet, Engine Coolant Thermostat Housing, Cover Thermo
Replaces: 11060AA060
Notes: Included with repair kit. Included with thermostat unit.
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • SVX,
    • WRX STI
MSRP $34.12
$23.34
MSRP $34.12
$23.34
Thermostat Housing
Part Number: 11060aa071
Other Names: Thermostat Cover, Cover Thermo
Replaces: 11060AA050, 11060AA070
Description: Without turbo. Manual trans. 2.5L, 2002-05. Forester. All. Impreza. 2.5l. 2.5L, 2005. 2.5L, 2006-07. Baja. Legacy/Outback. 2.5l.
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback
MSRP $26.82
$18.66
MSRP $26.82
$18.66
Thermostat Cover
Part Number: 11060AA190
Other Names: Thermostat Housing, Cover Thermo
Description: 3.6L. Legacy/Outback. 2008-14. Tribeca.
Fits:
  • Subaru:
    • Legacy,
    • Outback,
    • Tribeca
MSRP $23.15
$16.11
MSRP $23.15
$16.11
Thermostat Unit
Part Number: 21200AA230
Other Names: Thermostat Assembly
Description: 2.5L with turbo.
Notes: Included with thermostat.
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $33.03
$22.99
MSRP $33.03
$22.99
Thermostat Unit
Part Number: 21210AA030
Other Names: Thermostat, Repair Kit, Thermostat And Gasket Ay
Description: 3.6L. Legacy, Outback. Forester. 2.5L, 2005. 2.0L, with gasket.
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • WRX STI
MSRP $34.77
$23.78
MSRP $34.77
$23.78
Thermostat Cover
Part Number: 11060aa360
Options: Rear
Other Names: Thermostat Housing, Cover Thermo
Description: Rear. 2.0L, auto trans only.
Notes: Included with water pipe.
Fits:
  • Subaru:
    • Ascent,
    • Crosstrek,
    • Impreza
MSRP $19.57
$13.62
MSRP $19.57
$13.62
Thermostat Unit
Part Number: 21210AA080
Other Names: Thermostat, Thermostat And Gasket Ay
Description: 3.6L. Legacy/Outback. 2.5l. Tribeca. 2008-14. 2.5L without turbo, 2009-10. Legacy/Outback. 3.0l. 2006-07.
Fits:
  • Subaru:
    • B9 Tribeca,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • Tribeca
MSRP $35.42
$24.23
MSRP $35.42
$24.23
Engine Coolant Thermostat
Part Number: 21210AA300
Other Names: Thermostat
Description: Impreza. Crosstrek. 2.0L, with hybrid. Incl.Gasket.
Notes: Includes Gasket.
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza
MSRP $39.95
$27.33
MSRP $39.95
$27.33
Thermostat O-Ring
Part Number: 21236AA101
Options: Rear
Other Names: Thermostat Seal, Gasket Thermo
Replaces: 21236AA100
Description: Transmission Cooling. Rear. Impreza. Legacy, Outback. 2.0L, to 07/13/2022. BRZ.
Notes: Included with thermostat.
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza
MSRP $4.40
$3.06
MSRP $4.40
$3.06
Engine Coolant Thermostat
Part Number: 21200AA072
Other Names: Thermostat
Replaces: 21200AA070, 21200AA071
Notes: Included with repair kit. Included with thermostat unit.
Fits:
  • Subaru:
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • SVX,
    • WRX STI
MSRP $32.75
$22.79
MSRP $32.75
$22.79
Engine Coolant Thermostat
Part Number: 73540FL640
Other Names: Thermostat, Thms Thermo Ay
Description: With hybrid.
Notes: Included with AC & heater assembly.
Fits:
  • Subaru:
    • Crosstrek
MSRP $53.23
$36.41
MSRP $53.23
$36.41
Thermostat Housing Bolt
Part Number: 21177AA000
Other Names: Engine Coolant Thermostat Housing Bolt, Bolt
Description: 2.5L, 2005.
Fits:
  • Subaru:
    • Baja,
    • Legacy,
    • Outback
MSRP $0.90
$0.52
MSRP $0.90
$0.52
Engine Coolant Thermostat
Part Number: 21200AA121
Other Names: Thermostat
Replaces: 21200AA050, 21200AA060, 21200AA100, 21200AA120, 317534302, 417537000, 417537300
Description: All models. XT, sedan, coupe, wagon,hatchback. Loyale. Brat. XT coupe. 1.8l.
Fits:
  • Subaru:
    • Brat,
    • DL,
    • GL,
    • GL-10,
    • Justy,
    • Loyale,
    • RX,
    • Standard,
    • XT
MSRP $22.85
$15.90
MSRP $22.85
$15.90
Engine Coolant Thermostat
Part Number: 21200aa170
Other Names: Thermostat, Thermostat Cover Bolt, Thermostat Assembly
Description: Thermostat. Impreza. Forester. 2.5L, 2006-07.
Notes: Included with thermostat unit.
Fits:
  • Subaru:
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • Tribeca
MSRP $30.75
$21.40
MSRP $30.75
$21.40
Engine Coolant Thermostat
Part Number: 21210AA211
Other Names: Thermostat, Thermostat And Gasket Ay
Replaces: 21210AA210
Description: Impreza. Legacy. Without turbo. Outback. Engine Cooling. Incl.Gasket. XV Crosstrek, Crosstrek.
Notes: Includes Gasket.
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $42.50
$29.07
MSRP $42.50
$29.07
Engine Coolant Thermostat Housing
Part Number: 11060aa390
Options: Upper
Other Names: Thermostat Cover, Thermostat Housing, Cover Thermo
Description: 2.5L thermostat. 2.5L, upper.
Fits:
  • Subaru:
    • Crosstrek,
    • Forester,
    • Legacy,
    • Outback
MSRP $19.57
$13.62
MSRP $19.57
$13.62
Engine Coolant Thermostat Housing
Part Number: 11060aa260
Options: Lower
Other Names: Thermostat Housing, Water Inlet, Thermostat Cover, Outlet Tube, Cover Thermo
Fits:
  • Subaru:
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $26.42
$18.39
MSRP $26.42
$18.39
Engine Coolant Thermostat Housing
Part Number: 11060aa270
Other Names: Thermostat Housing, Water Inlet, Cover Thermo
Description: Transmission Cooling. Legacy, Outback. Impreza. XV Crosstrek. Without hybrid.
Fits:
  • Subaru:
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $19.57
$13.62
MSRP $19.57
$13.62
Engine Coolant Thermostat Housing
Part Number: 11060AA300
Options: Lower, Front
Other Names: Thermostat Housing, Water Outlet, Water Inlet, Thermostat Cover, Engine Coolant Outlet Flange, Cover Thermo
Description: WRX. Impreza. Front. Crosstrek. Ascent. Forester. With turbo. 2.5L, lower. 2.0L, with hybrid.
Fits:
  • Subaru:
    • Ascent,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • WRX
MSRP $37.28
$25.50
MSRP $37.28
$25.50
Engine Coolant Thermostat Housing Bolt
Part Number: 808206040
Other Names: Water Pump Bolt, Thermostat Housing Bolt, Water Pipe Bolt, Water Manifold Bolt, Thermostat Cover Bolt, Engine Coolant Outlet Housing...
Description: 2.5L. 3.6L. 2.0L, with hybrid.
Notes: Included with water pipe.
Fits:
  • Subaru:
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • WRX,
    • XV Crosstrek
MSRP $1.82
$1.26
MSRP $1.82
$1.26
Thermostat
Part Number: 21200AA080
Description: All models. Xt6. XT coupe. 2.7l.
Fits:
  • Subaru:
    • XT
MSRP $25.93
$18.05
MSRP $25.93
$18.05
Thermostat
Part Number: 21200KA131
Replaces: 21200KA130
Description: Justy. With fuel injection.
Fits:
  • Subaru:
    • Justy
MSRP $22.28
$15.51
MSRP $22.28
$15.51
Thermostat
Part Number: 21210AA291
Options: Upper
Other Names: Thermo Gasket Ay
Replaces: 21210AA290
Description: 2.5L, thermostat. Legacy, Outback. Forester. 2.5L, upper, to 07/13/2022. Crosstrek.
Notes: Includes Gasket.
Fits:
  • Subaru:
    • Crosstrek
MSRP $43.82
$29.97
MSRP $43.82
$29.97
Thermostat
Part Number: 21210AA191
Options: Upper, Rear
Other Names: Thermo Gasket Ay
Replaces: 21210AA190
Description: Transmission Cooling. Incl.Gasket. Rear. Impreza. Legacy, Outback. XV Crosstrek. Auto trans only. BRZ.
Notes: Included with water pipe.
Fits:
  • Subaru:
    • Crosstrek,
    • Impreza
MSRP $39.43
$26.97
MSRP $39.43
$26.97
Thermistor
Part Number: 73540SA020
Other Names: Thermostat Cooling
Description: Manual control, from 2-1-05.
Notes: Included with evaporator assembly.
Fits:
  • Subaru:
    • Forester
MSRP $119.35
$80.20
MSRP $119.35
$80.20
Gasket
Part Number: 21236AA010
Other Names: Thermostat Gasket, Engine Coolant Thermostat Gasket, Thermostat Housing Gasket, Thermostat Unit Gasket, Thermostat Cover Gasket,...
Replaces: 21236AA000
Notes: Included with repair kit. Included with thermostat unit.
Fits:
  • Subaru:
    • B9 Tribeca,
    • Baja,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • SVX,
    • Tribeca,
    • WRX STI
MSRP $3.93
$2.74
MSRP $3.93
$2.74
Thermostat Housing
Part Number: 417545900
Other Names: Cover Thermo
Description: All models. Justy. Without fuel injection.
Fits:
  • Subaru:
    • Justy
MSRP $17.60
$12.25
MSRP $17.60
$12.25
Thermostatic Switch
Part Number: 73540XC01A
Options: Front
Other Names: HVAC Evaporator Temperature Switch, Thms Thermo Assembly
Description: Ascent. From 01/20. For Primary HVAC.
Fits:
  • Subaru:
    • Ascent
MSRP $22.72
$15.81
MSRP $22.72
$15.81
HVAC Evaporator Temperature Switch
Part Number: 73540FL500
Other Names: Thermostat Ay Cooling
Fits:
  • Subaru:
    • Crosstrek
MSRP $53.23
$36.41
MSRP $53.23
$36.41
Thermostat Housing
Part Number: 11060AA220
Other Names: Water Inlet, Cover Thermo
Description: Legacy. With turbo.
Fits:
  • Subaru:
    • Legacy,
    • Outback
MSRP $40.97
$28.02
MSRP $40.97
$28.02
Gasket
Part Number: 21236aa050
Other Names: Thermostat Gasket, Engine Coolant Thermostat Gasket, Gasket Thermo
Description: Forester. 2.5L without turbo, 2011-13. Impreza. Legacy/Outback. Engine Cooling. XV Crosstrek, Crosstrek.
Notes: Included with thermostat. Part cannot be reused/reinstalled. Included with thermostat. Part is not reuseable, replace only.
Fits:
  • Subaru:
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • XV Crosstrek
MSRP $4.40
$3.06
MSRP $4.40
$3.06
Gasket
Part Number: 21236aa070
Options: Front
Other Names: Thermostat Gasket, Engine Coolant Thermostat Gasket, Gasket Thermo
Description: WRX. Front. Crosstrek. Ascent. Forester. With turbo. Impreza. 2.0L, with hybrid.
Notes: Included with thermostat. Part cannot be reused/reinstalled.
Fits:
  • Subaru:
    • Ascent,
    • Crosstrek,
    • Forester,
    • Impreza,
    • WRX
MSRP $4.40
$3.06
MSRP $4.40
$3.06
Temp Sensor
Part Number: 73540xc00a
Options: Inner
Other Names: Thermostatic Switch, Thms Thermo Assembly
Description: Inner components. Ascent. To 01/20.
Notes: Included with AC & heater assembly.
Fits:
  • Subaru:
    • Ascent
MSRP $9.57
$6.66
MSRP $9.57
$6.66
Temp Sensor
Part Number: 73540FL010
Options: Inner
Other Names: Thermostatic Switch, Thermistor Thermo Ay
Description: Inner components, #2. Forester.
Notes: Included with AC & heater assembly.
Fits:
  • Subaru:
    • Forester
MSRP $54.67
$37.39
MSRP $54.67
$37.39
Thermostat Housing
Part Number: 11060aa290
Options: Upper
Other Names: Cover Thermo
Description: BRZ. Upper, auto trans only.
Fits:
  • Subaru:
    • BRZ
MSRP $19.57
$13.62
MSRP $19.57
$13.62
Thermostat Housing
Part Number: 11060aa320
Other Names: Cover, Cover Thermo
Description: BRZ. Manual trans.
Fits:
  • Subaru:
    • BRZ
MSRP $8.22
$5.72
MSRP $8.22
$5.72
Thermostat Housing
Part Number: 11060AA410
Other Names: Cover Thermo
Description: Auto trans only. BRZ. Automatic trans.
Fits:
  • Subaru:
    • BRZ
MSRP $20.50
$14.27
MSRP $20.50
$14.27
Cover O-Ring
Part Number: 806929050
Other Names: Engine Coolant Thermostat Gasket, O Ring 29.7X3.5
Description: Transmission Cooling. Block-Off Plate.
Fits:
  • Subaru:
    • BRZ
MSRP $2.05
$1.43
MSRP $2.05
$1.43
Water Pump Bolt
Part Number: 808206210
Other Names: Thermostat Housing Bolt, Water Pipe Bolt, Thermostat Cover Bolt, Thermostat Bolt, Water Outlet Bolt, Water Pump Mount Bolt, Engine...
Description: 2.5L. 2.4L turbo. Water pump,mount bolt.
Fits:
  • Subaru:
    • Ascent,
    • Impreza,
    • Legacy,
    • Outback
MSRP $1.10
$0.64
MSRP $1.10
$0.64
Pulley Bolt
Part Number: 800606980
Other Names: Thermostat Housing Bolt, Engine Water Pump Pulley Bolt, Bolt 6X12X12
Description: 2.5L without turbo, 2011-13. 2.4L turbo. 2.5L without turbo, 2013-14. 2.0L, with hybrid.
Fits:
  • Subaru:
    • Ascent,
    • BRZ,
    • Crosstrek,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • WRX,
    • XV Crosstrek
MSRP $0.64
$0.37
MSRP $0.64
$0.37
A/C Refrigerant Line Bolt
Part Number: 010406250
Other Names: Engine Coolant Thermostat Housing Bolt, Engine Intake Manifold Bolt, Engine Water Pump Bolt, Cooler Pipe Bolt, Hose & Tube Assembly...
Description: 2.5L. All Required. With hybrid.
Fits:
  • Subaru:
    • BRZ,
    • Crosstrek,
    • Impreza,
    • WRX STI
MSRP $0.90
$0.52
MSRP $0.90
$0.52
Engine Coolant Thermostat Housing
Part Number: 11060AA380
Other Names: Cover Thermo
Description: Transmission Cooling.
Fits:
  • Subaru:
    • Forester
MSRP $19.57
$13.62
MSRP $19.57
$13.62
Engine Coolant Thermostat Gasket
Part Number: 11072aa030
Other Names: Thermo Cover Gasket
Replaces: 11072AA000, 11072AA020, 817554100, 817554110, 817554120
Fits:
  • Subaru:
    • Brat,
    • DL,
    • GL,
    • GL-10,
    • Loyale,
    • RX,
    • Standard,
    • XT
MSRP $3.70
$2.58
MSRP $3.70
$2.58
Engine Coolant Thermostat Housing Bolt
Part Number: 01040625a
Other Names: A/C Refrigerant Line Bolt, Engine Coolant Inlet Flange Bolt, Engine Water Pump Bolt, Engine Coolant Pipe Bolt, Flange Bolt
Description: 3.6L. 2.0L. 2.5L.
Fits:
  • Subaru:
    • B9 Tribeca,
    • Forester,
    • Impreza,
    • Legacy,
    • Outback,
    • Tribeca
MSRP $0.82
$0.48
MSRP $0.82
$0.48
Thermostat
Part Number: 73071AA040
MSRP $130.48
$87.68
MSRP $130.48
$87.68

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