Lexus Thermostats

What does the factory thermostat in a car do? That it helps prevent engine overheats is the short answer. However, it's less obvious how a simple valve, one of the many parts of a cooling system, can achieve this. Yes, how your original thermostat works may be simple: it opens and closes using either a spring or piston, and this circulates coolant through your engine and radiator. However, it's getting the interval right that's key. (After all, coolant must stay within the proper temperature range, whether it's hot out or cold.) Everything happens the way it should, though, thanks to the many other auto parts that work at the same time. They work so well that car thermostat failure is rare and the question of when to replace a car thermostat rarely comes up. If your temperature gauge reads constant, dead-center or slightly cold, then, great news: your thermostat's working normally. However, that doesn't mean it can't go bad, with age or otherwise. There are symptoms of a thermostat not working right, namely a lit Check Engine light, improper valve operation, and stuck valves. Usually, they show up as engine problems and AC and heating malfunctions, though. A non-working thermostat valve can't move coolant correctly, and this either results in an overheat or keeps coolant from reaching the appropriate temperature. Engine efficiency then drops, and your HVAC system stops heating and cooling right. Even the hoses and gaskets surrounding the thermostat area can warp, that is, if they don't fail altogether. In these cases, run an inspection. If you need to change your car thermostat, it's best to swap it out with a genuine Lexus thermostat. You can order one from our auto parts counter online. Buy now and enjoy peace of mind down the road.

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Thermostat Unit
Part Number: 16031-36010
Other Names: Thermostat, Water Inlet, Inlet Sub Assembly Wate More Names
Description: ES300h. 2.5L. More Info
Notes: Includes Thermostat. More Notes
MSRP $51.09
$39.92
MSRP $51.09
$39.92
Thermostat Housing
Part Number: 16323-0P030
Options: Lower
Other Names: Engine Coolant Thermostat Housing, Housing Water Inlet More Names
Description: Canada built. RX350. Exc.Japan Built. Engine # axxxxxx-gxxxxxx. ES350. Usa built. More Info
MSRP $90.48
$67.44
MSRP $90.48
$67.44
Thermostat Housing
Part Number: 16321-46040
Other Names: Thermostat Cover, Inlet Water More Names
Replaces: 16321-46030
Description: SC300, GS300. IS300. 3.0L. More Info
MSRP $44.85
$35.05
MSRP $44.85
$35.05
Gasket Thermostat
Part Number: 16346-36011
Options: Left, Right, Outer
Other Names: Water Inlet Gasket, Thermostat Gasket, Engine Coolant Thermostat Gasket, Gasket Thermostat More Names
Replaces: 16346-36010
MSRP $6.72
$5.25
MSRP $6.72
$5.25
Thermostat Housing Gasket
Part Number: 16346-32010
Other Names: Engine Coolant Thermostat Gasket, Thermostat Gasket, Gasket Thermostat More Names
Replaces: 16346-17010
Description: 4.0L. From 07/97. O-Ring. To 01/1998. 1998-00, to 1/98. 4.3L. More Info
MSRP $4.57
$3.58
MSRP $4.57
$3.58
Thermostat Unit Seal
Part Number: 16325-36010
Other Names: Thermostat Gasket, Gasket Water Inlet More Names
Description: ES300h. 2.5L. More Info
Notes: Included with thermostat unit. More Notes
MSRP $5.83
$4.56
MSRP $5.83
$4.56
Engine Coolant Thermostat
Part Number: 90916-03100
Other Names: Thermostat More Names
MSRP $28.66
$22.40
MSRP $28.66
$22.40
Thermostat Housing Gasket
Part Number: 16325-0P020
Other Names: Engine Coolant Thermostat Housing Gasket, Gasket Water Inlet More Names
Description: Canada built. Engine # axxxxxx-gxxxxxx. Exc.Japan Built Part. More Info
MSRP $2.59
$2.02
MSRP $2.59
$2.02
Engine Coolant Thermostat
Part Number: 90916-03075
Other Names: Thermostat More Names
Description: 1992-93. ES300. ES250. More Info
MSRP $35.49
$27.74
MSRP $35.49
$27.74
Engine Coolant Thermostat
Part Number: 90916-03138
Other Names: Thermostat More Names
Description: SC430. GX470. From 07/2006. GS430. More Info
MSRP $53.82
$42.07
MSRP $53.82
$42.07
Thermostat Housing
Part Number: 16321-20030
Other Names: Water Inlet, Water Outlet, Inlet Pipe, Inlet Water More Names
Replaces: 16321-0A030
Description: ES300. RX300. ES330. RX330. RX400h. 2004-06, japan built, type 1. More Info
MSRP $84.53
$63.02
MSRP $84.53
$63.02
Engine Coolant Thermostat Gasket
Part Number: 16346-50010
Other Names: Thermostat Gasket, Gasket, Water Inlet Gasket, Thermostat Housing Gasket, Thermostat Seal, Gasket Thermostat More Names
Description: LX470. GX470. O-Ring. 4.3L. 1998-00, from 1-98. From 01/1998. GS430. More Info
MSRP $6.64
$5.19
MSRP $6.64
$5.19
Engine Coolant Thermostat Gasket
Part Number: 16346-66020
Other Names: Gasket Thermostat More Names
MSRP $6.03
$4.72
MSRP $6.03
$4.72
Thermostat Housing O-Ring
Part Number: 16325-38010
Other Names: Water Inlet Gasket, Engine Coolant Thermostat Housing Gasket, Gasket Water Inlet More Names
MSRP $2.59
$2.02
MSRP $2.59
$2.02
Engine Coolant Thermostat Housing
Part Number: 16321-50010
Options: Upper
Other Names: Thermostat Cover, Water Inlet, Inlet Water More Names
Description: 1992-97. To 09/97. More Info
MSRP $44.74
$34.97
MSRP $44.74
$34.97
Engine Coolant Thermostat Housing Gasket
Part Number: 16119-66020
Other Names: Gasket Thermostat G More Names
MSRP $7.93
$6.20
MSRP $7.93
$6.20
Thermostat
Part Number: 90916-03093
Description: SC300, GS300. IS300. 3.0L. More Info
MSRP $28.71
$22.44
MSRP $28.71
$22.44
Thermostat
Part Number: 90916-03136
Description: Hs hybrid. More Info
MSRP $28.58
$22.33
MSRP $28.58
$22.33
Engine Coolant Thermostat
Part Number: 90916-03156
Options: Left, Right, Outer
Other Names: Thermostat More Names
Notes: Part Of Water Inlet On Not Serviced Model Years. More Notes
MSRP $63.42
$49.56
MSRP $63.42
$49.56
Thermostat
Part Number: 90916-A3002
Replaces: 90916-03133, 90916-03140, 90916-A3001
Description: RX350. Japan built. 3.5L. ES350. RX450h. 2007-09. More Info
MSRP $28.58
$22.33
MSRP $28.58
$22.33
Water Inlet
Part Number: 90916-A3003
Other Names: Thermostat More Names
Replaces: 90916-03084, 90916-03129
Description: LS400, SC400. ES300. 1992-97. RX300. 1994-96. 2004-06. ES330. RX400h. RX330. More Info
MSRP $28.60
$22.36
MSRP $28.60
$22.36
Engine Coolant Thermostat
Part Number: 90916-03154
Options: Right, Left, Inner
Other Names: Thermostat More Names
Notes: Part Of Water Inlet On Not Serviced Model Years. More Notes
MSRP $35.91
$28.07
MSRP $35.91
$28.07
Thermostat
Part Number: 90916-03117
Replaces: 90916-03094
Description: LX450. More Info
MSRP $35.77
$27.95
MSRP $35.77
$27.95
Thermostat
Part Number: 16342-70010
Other Names: Valve Water Control More Names
Description: Water control valve. LS500. More Info
MSRP $975.94
$692.33
MSRP $975.94
$692.33
Thermistor Assembly Air
Part Number: 88620-0R010
Other Names: Thermostat Assembly More Names
Replaces: 88620-28060
Description: 250h. More Info
Notes: Included with AC & heater asssembly. More Notes
MSRP $41.07
$32.10
MSRP $41.07
$32.10
Inlet Sub Assembly Wate
Part Number: 16031-0S010
Other Names: Thermostat Unit, Thermostat Housing, Thermostat, Thermostat Unit Gasket, Engine Coolant Thermostat Kit, Inlet Sub Assembly Wate More Names
Replaces: 16031-38010
Notes: Included with inlet assembly. Includes Thermostat And Gasket. Included with thermostat unit. Part cannot be reused/reinstalled. Part has... More Notes
MSRP $55.08
$43.04
MSRP $55.08
$43.04
Water Inlet
Part Number: 16321-0F010
Options: Upper
Other Names: Thermostat Housing, Engine Coolant Thermostat Housing, Thermostat Cover, Inlet Water More Names
Replaces: 16321-50020
Description: LX470. Cover. GX470. 1998-00. 4.0L. GS400. 4.3L. GS430. From 07/97. More Info
MSRP $84.53
$63.02
MSRP $84.53
$63.02
Water Inlet
Part Number: 16031-31020
Other Names: Thermostat Housing, Thermostat Unit, Engine Coolant Thermostat Kit, Inlet Sub Assembly Wate More Names
Notes: Included with inlet assembly. Includes Thermostat And Gasket. Part has related components that cannot be reused/reinstalled. gasket. More Notes
MSRP $71.59
$55.95
MSRP $71.59
$55.95
Engine Coolant Thermostat Gasket
Part Number: 16326-38010
Other Names: Gasket, Water Inlet Gasket, Thermostat Unit Gasket, Thermostat Housing O-Ring, Thermostat Seal, Thermostat Unit O-Ring, Gasket... More Names
Notes: Included with thermostat housing. Included with water inlet. Part cannot be reused/reinstalled. More Notes
MSRP $6.01
$4.69
MSRP $6.01
$4.69
Thermostat Housing
Part Number: 16321-20010
Other Names: Water Inlet, Inlet Water More Names
Replaces: 16321-0A020
Description: ES300. 1994-96. More Info
MSRP $102.78
$76.62
MSRP $102.78
$76.62
Gasket Water Inlet
Part Number: 16326-31020
Other Names: Thermostat Housing Gasket, Water Inlet Gasket, Thermostat Unit Gasket, Engine Coolant Thermostat Gasket, Gasket Water Inlet More Names
Replaces: 16326-31010
Notes: Included with thermostat housing. Included with water inlet. Part cannot be reused/reinstalled. More Notes
MSRP $1.47
$1.14
MSRP $1.47
$1.14
Inlet Sub Assembly Wate
Part Number: 16031-24021
Other Names: Thermostat, Inlet Sub Assembly Wate More Names
Replaces: 16031-24020
Description: 250h. More Info
MSRP $74.39
$58.14
MSRP $74.39
$58.14
Housing Water Inlet
Part Number: 16323-0S010
Other Names: Water Inlet, Housing Water Inlet More Names
Replaces: 16323-38020
Description: LX570. With tow package. All. More Info
MSRP $71.83
$56.13
MSRP $71.83
$56.13
Water Manifold Gasket
Part Number: 16345-F0020
Other Names: Gasket Water Outlet More Names
Replaces: 16345-25030
Description: 2.5L. More Info
Notes: Part cannot be reused/reinstalled. More Notes
MSRP $4.40
$3.43
MSRP $4.40
$3.43
Housing Stud
Part Number: 92122-B0825
Other Names: Thermostat Housing Stud, Bolt Stud More Names
Notes: Included with thermostat housing. More Notes
MSRP $1.87
$1.46
MSRP $1.87
$1.46
Inlet Sub Assembly Wate
Part Number: 16031-24011
Other Names: Thermostat, Inlet Sub Assembly Wate More Names
Replaces: 16031-24010
Description: UX200. 200, 2019-2020. 200, 2021-2022. More Info
MSRP $62.69
$49.00
MSRP $62.69
$49.00
Gasket Water Inlet
Part Number: 16325-0T030
Other Names: Thermostat Seal, Gasket Water Inlet More Names
Replaces: 16325-28010
Description: 2.5L. NX300h. Hs hybrid. More Info
MSRP $7.27
$5.68
MSRP $7.27
$5.68
Inlet Sub Assembly Wate
Part Number: 16031-31031
Other Names: Thermostat, Inlet Sub Assembly Wate More Names
Replaces: 16031-31030
Description: Without hybrid. 3.5L. ES350. RX350L. More Info
Notes: Includes Thermostat And Gasket. Part has related component that cannot be reused/reinstalled. o-ring. More Notes
MSRP $66.66
$52.10
MSRP $66.66
$52.10
Water Inlet Seal
Part Number: 16326-37020
Other Names: Thermostat Gasket, Gasket Water Inlet More Names
Description: CT200h. More Info
Notes: Included with water inlet. More Notes
MSRP $5.92
$4.63
MSRP $5.92
$4.63
Engine Coolant Pipe O-Ring
Part Number: 96761-35035
Options: Lower
Other Names: Housing Gasket, Thermostat Housing O-Ring, Water Pipe O-Ring, Thermostat Housing Seal, Ring O More Names
Description: Lower Thermostat Housing. 5.0L. 4.3L. More Info
Notes: Part cannot be reused/reinstalled. More Notes
MSRP $5.00
$3.91
MSRP $5.00
$3.91
Gasket
Part Number: 16325-36051
Options: Inner, Right, Left
Other Names: Water Outlet Gasket, Thermostat Gasket, Engine Coolant Thermostat Gasket, Gasket Water Inlet More Names
Description: 2.0L, #1. Inner Thermostat. IS300. 2.0l. Right. IS200t. Left. GS200t. For t-stat: wax 78-91. GS300. More Info
MSRP $8.17
$6.38
MSRP $8.17
$6.38
Gasket Water Inlet
Part Number: 16325-62010
Other Names: Engine Coolant Thermostat Gasket, Thermostat Housing Gasket, Thermostat Seal, Gasket, Water Inlet Seal, Water Inlet Gasket, Gasket... More Names
Replaces: 16325-0H020
MSRP $7.67
$5.99
MSRP $7.67
$5.99
In-Car Sensor
Part Number: 88620-74010
Other Names: Thermistor, Thermostatic Switch, Thermistor Assembly Air More Names
Description: LS500. Without hybrid. More Info
Notes: Included with AC & heater assembly. More Notes
MSRP $41.07
$32.10
MSRP $41.07
$32.10
Water Inlet
Part Number: 16321-31030
Other Names: Inlet Pipe, Thermostat Housing, Inlet Water More Names
Replaces: 16321-31011
Description: RX350. Japan built. 3.5L. Without tow hitch. RX450h. Without towing package. ES350. 2007-09. More Info
Notes: Order by description. More Notes
MSRP $44.45
$34.74
MSRP $44.45
$34.74
Water Inlet
Part Number: 16321-0P010
Options: Upper
Other Names: Engine Coolant Thermostat Housing, Inlet Water More Names
Description: Canada built. Exc.Japan Built. Engine # axxxxxx-gxxxxxx. ES350. Usa built. More Info
MSRP $42.06
$32.88
MSRP $42.06
$32.88
Water Outlet Gasket
Part Number: 16325-31010
Other Names: Engine Coolant Thermostat Housing Gasket, Thermostat Housing Gasket, Housing Gasket, Gasket Water Inlet More Names
Description: Is 250/350. 3.0, 3.5L. To 10/2017. To 11/2017. 2007-09. Exc.Japan Built. Japan Built Part. More Info
Notes: Included with water outlet. More Notes
MSRP $2.16
$1.69
MSRP $2.16
$1.69
In-Car Sensor
Part Number: 88620-30290
Other Names: Thermistor, Thermostatic Switch, Thermistor Assembly Air More Names
Description: LS500h. With hybrid. More Info
Notes: Included with AC & heater assembly. More Notes
MSRP $45.80
$35.80
MSRP $45.80
$35.80
Water Inlet O-Ring
Part Number: 16326-31050
Other Names: Water Inlet Gasket, Thermostat Gasket, Gasket, Engine Coolant Thermostat Gasket, Gasket Water Inlet More Names
Notes: Included with water inlet. Part cannot be reused/reinstalled. More Notes
MSRP $0.80
$0.62
MSRP $0.80
$0.62
Housing Water Inlet
Part Number: 16323-0S020
Options: Lower
Other Names: Engine Coolant Thermostat Housing, Housing Water Inlet More Names
Replaces: 16323-38010
Description: LX570. Without tow package. Exc.Towing Package. More Info
MSRP $70.62
$55.20
MSRP $70.62
$55.20
Thermostatic Switch
Part Number: 88625-48060
Other Names: Thermistor, Thermistor Cooler More Names
Description: RX330. More Info
Notes: Included with evaporator assembly. More Notes
MSRP $25.14
$19.66
MSRP $25.14
$19.66

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