24/7 Customer service
USD
To make aftermarket auto parts an afterthought.
Add your vehicle
Address
Login
Cart
Item
$0.00
A-Premium Labor Day Deals Up to 15% OFFA-Premium Labor Day Deals Up to 15% OFF
Add your vehicle to ensure fitment/Choose a yearRequired Fields
Select a different vehicle
Make/Model
VIN
Save

Lexus LS430 Thermostat

3 items

Upgrade your vehicle's thermostat with A-Premium's high-quality options. Choose reliability and durability for a smoother ride.

  • All filters
  • Sort By
  • Year
  • Price
  • Brand
  • Material
  • Warranty
A-Premium APTHE001 Engine Coolant ThermostatA-Premium APTHE001 Engine Coolant Thermostat
A-Premium®Part # APTHE001
A-Premium APTHE001 Engine Coolant Thermostat
4.692 Reviews
$23.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2020 - 2020 Nissan Armada, 2019 - 2020 Mitsubishi Outlander, 2016 - 2016 Nissan Frontier, 2016 - 2016 Nissan NV1500, 2016 - 2016 Nissan NV2500, 2016 - 2016 Nissan NV3500, 2015 - 2015 INFINITI Q70L, 2014 - 2016 INFINITI QX80, 2014 - 2015 INFINITI Q70, 2014 - 2014 INFINITI QX70, 2013 - 2015 Acura RDX, 2012 - 2017 Nissan NV2500, 2012 - 2017 Nissan NV3500, 2012 - 2012 Honda Crosstour, 2011 - 2013 INFINITI M56, 2010 - 2014 Acura TSX, 2010 - 2013 Acura ZDX, 2010 - 2011 Honda Accord Crosstour, 2010 - 2011 Mitsubishi Endeavor, 2009 - 2014 Acura TL
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Lexus LS430
Item LocatedUnited States
Quantity1
MaterialMetal and Rubber
ConditionNew
item #1005V2X1
Show less
Beck/Arnley 143-0789 Engine Coolant Thermostat
Beck/ArnleyPart # 143-0789
Beck/Arnley 143-0789 Engine Coolant Thermostat
52 Reviews
$34.99
Edit ZIP code
3-year warranty
90 days free return
Fits 2008-2009 Toyota Sequoia, 2003-2009 Lexus GX470, 2003-2009 Toyota 4Runner, 2002-2010 Lexus SC430, 2001-2007 Lexus GS430, 2001-2007 Toyota Sequoia, 2001-2006 Lexus LS430, 2000-2009 Toyota Tundra, 1998-2007 Lexus LX470, 1998-2000 Lexus GS400, 1998-2000 Lexus LS400, 1998-2000 Lexus SC400, 1997-1997 Lexus LS400, 1996-1997 Lexus LX450, 1993-2007 Toyota Land Cruiser
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Lexus LS430
Item LocatedUnited States
Quantity1
Part interchange
143-0789
item #1000XLEH
Show less
Engine Coolant Thermostat - Mahle TX 148 82
MahlePart # TX 148 82
Engine Coolant Thermostat - Mahle TX 148 82
51 Reviews
$32.99
Edit ZIP code
3-year warranty
90 days free return
Fits 2008-2009 Toyota Sequoia, 2003-2009 Lexus GX470, 2003-2009 Toyota 4Runner, 2002-2010 Lexus SC430, 2001-2007 Lexus GS430, 2001-2007 Toyota Sequoia, 2001-2006 Lexus LS430, 2000-2009 Toyota Tundra, 1998-2007 Lexus LX470, 1998-2000 Lexus GS400, 1997-2000 Lexus LS400, 1997-2000 Lexus SC400, 1992-2007 Toyota Land Cruiser
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Lexus LS430
Item LocatedUnited States
Quantity1
Part interchange
TX 148 82, 33878, 14128, TX14882, 302-180, 90916-03100, 90916-03117, 90916-03138
item #1000XSGZ
Show less

What is an engine thermostat?

 While all engines can become too hot, if your thermostat isn't working correctly, your engine's well-being is at serious risk. The engine thermostat, often simply referred to as a thermostat, regulates the engine's operating temperature within an optimal range (typically around 195 to 220 degrees Fahrenheit).

How does a car thermostat work?

As a temperature-sensitive valve within the cooling system, a car thermostat responds to changes in coolant temperature. Understanding how it works by the following breakdown steps:

  • Closed position (cold start)

Initially closed to help the engine warm up quickly.

  • Heating up

The engine generates heat during operation.

  • Opening the thermostat

A temperature-sensitive element (usually wax) causes the thermostat to open gradually.

  • Coolant flow

When open, coolant flows from the engine to the radiator.

  • Maintaining optimal temperature

Adjusts coolant flow to maintain the ideal engine temperature.

  • Temperature regulation

Continuously adjusts to prevent overheating and ensure efficient operation.

Signs of a bad thermostat

  1. Overheating: The engine becomes excessively hot due to a stuck-closed thermostat.
  2. Low or fluctuating temperature: A thermostat stuck open results in a cooler engine, affecting fuel efficiency and heating.
  3. Temperature warning light: Illuminates to indicate engine overheating due to a faulty thermostat.
  4. Poor fuel efficiency: Stuck-open thermostat reduces fuel efficiency as the engine operates less efficiently at lower temperatures.
  5. Inadequate cabin heating: Insufficient cabin heating in cold weather with a thermostat that's stuck open.
  6. Coolant leaks: Gasket or sealing issues can lead to coolant leaks.
  7. Rapid temperature fluctuations: The gauge shows rapid swings between hot and cold.
  8. Engine running hot at idle: Higher engine temperature during idle or in traffic due to restricted coolant flow.
  9. Slow or inconsistent warm-up: Longer-than-normal warm-up times, even in moderate weather.
  10. Inconsistent heater operation: This affects the performance of the vehicle's heater, causing inconsistent or inadequate heating in cold weather.

Related Blogs

Why Does Coolant Boil After You Turn the Engine Off?

Learn why coolant boils or bubbles after you turn the engine off, how heat soak affects the cooling system, and how to diagnose leaks, trapped air, cap, thermostat, fan, water pump, or head gasket problems.

Jul 29, 2026