24/7 Customer service
USD
To make aftermarket auto parts an afterthought.
Add your vehicle
Address
Login
Cart
Item
$0.00
Add your vehicle to ensure fitment/Choose a yearRequired Fields
Select a different vehicle
Make/Model
VIN
Save

Chevrolet Trailblazer Thermostat

12 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
  • Placement on Vehicle
  • Brand
  • Material
  • Color
  • Warranty
Thermostat Housing Assembly for Cadillac Escalade Chevrolet Silverado 1500 GMCThermostat Housing Assembly for Cadillac Escalade Chevrolet Silverado 1500 GMC
A-Premium®Part # APTHA0128
Thermostat Housing Assembly for Cadillac Escalade Chevrolet Silverado 1500 GMC
4.692 Reviews
$22.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2003 - 2003 Cadillac Escalade ESV, 2003 - 2003 Chevrolet Express 1500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Silverado 1500, 2003 - 2003 Chevrolet SSR, 2003 - 2003 Chevrolet Trailblazer EXT, 2003 - 2003 Chevrolet W3500 Tiltmaster, 2003 - 2003 Chevrolet W4500 Tiltmaster, 2003 - 2003 GMC Envoy XL, 2003 - 2003 GMC Savana 1500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 3500, 2003 - 2003 GMC Savana 3500
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
MaterialAluminum
ConditionNew
item #10027T01
Show less
Thermostat Housing Assembly for Chevrolet Silverado 1500 GMC Canyon Sierra 1500
A-Premium®Part # APTHA0203
Thermostat Housing Assembly for Chevrolet Silverado 1500 GMC Canyon Sierra 1500
4.692 Reviews
$20.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2022 - 2022 Chevrolet Express 4500, 2022 - 2022 Chevrolet Silverado 1500 LTD, 2022 - 2022 Chevrolet Silverado 1500 LTD, 2022 - 2022 GMC Savana 4500, 2022 - 2022 GMC Sierra 1500 Limited, 2022 - 2022 GMC Sierra 1500 Limited, 2021 - 2022 Cadillac Escalade, 2021 - 2022 Cadillac Escalade ESV, 2021 - 2022 Chevrolet Express 2500, 2021 - 2022 Chevrolet Express 3500, 2021 - 2022 Chevrolet LCF 3500, 2021 - 2022 Chevrolet Suburban, 2021 - 2022 Chevrolet Suburban, 2021 - 2022 Chevrolet Tahoe, 2021 - 2022 Chevrolet Tahoe, 2021 - 2022 GMC Savana 2500, 2021 - 2022 GMC Savana 3500, 2021 - 2022 GMC Yukon, 2021 - 2022 GMC Yukon, 2021 - 2022 GMC Yukon XL
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
Installation PositionWater Pump
ConditionNew
item #1000W523
Show less
A-Premium APTHE031 Engine Coolant Thermostat
A-Premium®Part # APTHE031
A-Premium APTHE031 Engine Coolant Thermostat
4.692 Reviews
$21.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2022 - 2023 Chevrolet Corvette, 2021 - 2023 Cadillac Escalade, 2021 - 2023 Cadillac Escalade ESV, 2021 - 2023 Chevrolet Silverado 2500 HD, 2021 - 2023 Chevrolet Silverado 3500 HD, 2021 - 2023 Chevrolet Suburban, 2021 - 2023 Chevrolet Suburban, 2021 - 2023 Chevrolet Tahoe, 2021 - 2023 Chevrolet Tahoe, 2021 - 2021 Chevrolet Express 2500, 2021 - 2021 Chevrolet Express 3500, 2019 - 2023 Chevrolet Silverado 1500, 2019 - 2023 Chevrolet Silverado 1500, 2019 - 2021 Chevrolet Silverado 1500, 2018 - 2021 Chevrolet Express 2500, 2018 - 2021 Chevrolet Express 3500, 2017 - 2019 Chevrolet Suburban, 2016 - 2020 Chevrolet LCF 3500, 2016 - 2019 Chevrolet LCF 4500, 2016 - 2019 Chevrolet Suburban 3500 HD
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
MaterialMetal and Rubber
ConditionNew
item #1005V2VZ
Show less
Thermostat Housing for Chevrolet Silverado 1500 GMC Sierra 1500 Buick Cadillac
A-Premium®Part # APTHA0198
Thermostat Housing for Chevrolet Silverado 1500 GMC Sierra 1500 Buick Cadillac
4.692 Reviews
$22.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2011 - 2012 Workhorse Custom Chassis W62, 2008 - 2009 Pontiac G8, 2007 - 2011 Workhorse W62, 2007 - 2007 Chevrolet Silverado 1500 Classic, 2007 - 2007 Chevrolet Silverado 1500 HD Classic, 2007 - 2007 Chevrolet Silverado 2500 HD Classic, 2007 - 2007 Chevrolet Silverado 3500 Classic, 2007 - 2007 Chevrolet Silverado 3500 HD, 2007 - 2007 GMC Sierra 1500 Classic, 2007 - 2007 GMC Sierra 1500 HD Classic, 2007 - 2007 GMC Sierra 2500 HD Classic, 2007 - 2007 GMC Sierra 3500 Classic, 2006 - 2012 Workhorse Custom Chassis W42, 2006 - 2011 Workhorse W42, 2006 - 2006 Chevrolet Trailblazer, 2005 - 2006 Chevrolet Silverado 1500 HD, 2005 - 2006 GMC Envoy, 2005 - 2006 GMC Sierra 1500 HD, 2005 - 2006 Saab 9-7x, 2005 - 2005 Workhorse FasTrack FT1261
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
ColorNatural
ConditionNew
item #1015204K
Show less
Thermostat Housing Assembly for Chevrolet Silverado 1500 1999-2003 GMC Cadillac
A-Premium®Part # APTHA0129
Thermostat Housing Assembly for Chevrolet Silverado 1500 1999-2003 GMC Cadillac
4.692 Reviews
$23.99
Low stock: Only 5 left
Edit ZIP code
2-year warranty
90 days free return
Fits 2003 - 2003 Cadillac Escalade ESV, 2003 - 2003 Chevrolet Express 1500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Silverado 1500, 2003 - 2003 Chevrolet SSR, 2003 - 2003 Chevrolet Trailblazer EXT, 2003 - 2003 Chevrolet W3500 Tiltmaster, 2003 - 2003 Chevrolet W4500 Tiltmaster, 2003 - 2003 GMC Envoy XL, 2003 - 2003 GMC Savana 1500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 3500, 2003 - 2003 GMC Savana 3500
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
MaterialAluminum
ConditionNew
item #10027QWE
Show less
Thermostat Housing Assembly for Chevy Silverado 1500 Avalanche 1500 Camaro Buick
A-Premium®Part # APTHA0131
Thermostat Housing Assembly for Chevy Silverado 1500 Avalanche 1500 Camaro Buick
4.692 Reviews
$35.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2011 - 2012 Workhorse Custom Chassis W62, 2008 - 2009 Buick Allure, 2008 - 2009 Buick LaCrosse, 2008 - 2008 Chevrolet Corvette, 2007 - 2007 Chevrolet Silverado 1500 Classic, 2007 - 2007 Chevrolet Silverado 1500 Classic, 2007 - 2007 Chevrolet Silverado 1500 Classic, 2007 - 2007 Chevrolet Silverado 1500 HD Classic, 2007 - 2007 Chevrolet Silverado 2500 HD Classic, 2007 - 2007 Chevrolet Silverado 3500 Classic, 2007 - 2007 Chevrolet Silverado 3500 HD, 2006 - 2012 Workhorse Custom Chassis W42, 2006 - 2010 Workhorse Custom Chassis W42, 2006 - 2009 Chevrolet Impala, 2006 - 2008 Chevrolet Corvette, 2006 - 2007 Cadillac CTS, 2006 - 2007 Chevrolet Monte Carlo, 2006 - 2006 Chevrolet Suburban 1500, 2006 - 2006 Chevrolet Trailblazer, 2006 - 2006 Chevrolet Trailblazer
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
ConditionNew
item #10021TUK
Note
This item comes with a Cover.
Show less
Engine Coolant Thermostat Housing Assembly for Chevrolet 99-03 GMC Sierra 1500
A-Premium®Part # APTHA0109
Engine Coolant Thermostat Housing Assembly for Chevrolet 99-03 GMC Sierra 1500
4.692 Reviews
$18.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2003 - 2003 Cadillac Escalade ESV, 2003 - 2003 Chevrolet Express 1500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 2500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Express 3500, 2003 - 2003 Chevrolet Silverado 1500, 2003 - 2003 Chevrolet Sonora, 2003 - 2003 Chevrolet SSR, 2003 - 2003 Chevrolet Trailblazer EXT, 2003 - 2003 Chevrolet W3500 Tiltmaster, 2003 - 2003 Chevrolet W4500 Tiltmaster, 2003 - 2003 GMC Envoy XL, 2003 - 2003 GMC Savana 1500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 2500, 2003 - 2003 GMC Savana 3500
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
ColorNatural
ConditionNew
item #1005DY14
Note
Engine Coolant Thermostat Housing Assembly -- With Water Pump Casting No. 12562459, Includes 186 Fahrenheit Degree Thermostat.
Show less
Thermostat Housing Assembly for Chevy Blazer Trailblazer GMC Envoy Buick Olds
A-Premium®Part # APTHA0084
Thermostat Housing Assembly for Chevy Blazer Trailblazer GMC Envoy Buick Olds
4.692 Reviews
$34.99
Low stock: Only 4 left
Edit ZIP code
2-year warranty
90 days free return
Fits 2005 - 2009 Saab 9-7x, 2004 - 2007 Buick Rainier, 2004 - 2005 GMC Envoy XUV, 2002 - 2009 Chevrolet Trailblazer, 2002 - 2009 GMC Envoy, 2002 - 2006 Chevrolet Trailblazer EXT, 2002 - 2006 GMC Envoy XL, 2002 - 2004 Oldsmobile Bravada, 2002 - 2002 Chevrolet Blazer
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
ColorNatural
ConditionNew
item #1005GR5U
Show less
Thermostat Housing Assembly with Thermostat for Chevy Blazer GMC Envoy Buick 180°F
A-Premium®Part # APTHA0127
Thermostat Housing Assembly with Thermostat for Chevy Blazer GMC Envoy Buick 180°F
4.692 Reviews
$40.99
Low stock: Only 1 left
Edit ZIP code
2-year warranty
90 days free return
Fits 2005 - 2009 Saab 9-7x, 2004 - 2007 Buick Rainier, 2004 - 2005 GMC Envoy XUV, 2002 - 2009 Chevrolet Trailblazer, 2002 - 2009 GMC Envoy, 2002 - 2006 Chevrolet Trailblazer EXT, 2002 - 2006 GMC Envoy XL, 2002 - 2004 Oldsmobile Bravada, 2002 - 2002 Chevrolet Blazer
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
ConditionNew
item #1000W7A0
Note
This item comes with a Cover.
Show less
Engine Coolant Thermostat Housing Assembly for Chevy Blazer GMC Buick Oldsmobile
A-Premium®Part # APTHA0130
Engine Coolant Thermostat Housing Assembly for Chevy Blazer GMC Buick Oldsmobile
4.692 Reviews
$41.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2005 - 2009 Saab 9-7X, 2004 - 2007 Buick Rainier, 2004 - 2005 GMC Envoy XUV, 2002 - 2009 Chevrolet Trailblazer, 2002 - 2009 GMC Envoy, 2002 - 2006 Chevrolet Trailblazer EXT, 2002 - 2006 GMC Envoy XL, 2002 - 2004 Oldsmobile Bravada, 2002 - 2002 Chevrolet Blazer
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
ConditionNew
item #1002LQXW
Note
Thermostat Housing Assembly -- 160 Degrees Fahrenheit, with a Cover.
Show less
ÜRO Parts GM0718508 Engine Coolant Thermostat Housing, Upper
ÜRO PartsPart # GM0718508
ÜRO Parts GM0718508 Engine Coolant Thermostat Housing, Upper
52 Reviews
$27.99
Edit ZIP code
3-year warranty
90 days free return
Fits 2011-2012 Workhorse Custom Chassis W62, 2008-2009 Pontiac G8, 2008-2008 GMC Sierra, 2007-2012 Workhorse Custom Chassis W42, 2007-2011 Workhorse W42, 2007-2011 Workhorse W62, 2007-2009 Chevrolet Silverado 2500, 2007-2007 Chevrolet Silverado 1500 Classic, 2007-2007 Chevrolet Silverado 1500 Classic, 2007-2007 Chevrolet Silverado 1500 Classic, 2007-2007 Chevrolet Silverado 1500 HD Classic, 2007-2007 Chevrolet Silverado 2500 HD Classic, 2007-2007 Chevrolet Silverado 3500 Classic, 2007-2007 Chevrolet Silverado 3500 HD, 2007-2007 GMC Sierra, 2007-2007 GMC Sierra 1500 Classic, 2007-2007 GMC Sierra 1500 Classic, 2007-2007 GMC Sierra 1500 Classic, 2007-2007 GMC Sierra 1500 HD Classic, 2007-2007 GMC Sierra 2500 HD Classic
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
Installation PositionUpper
ColorSilver
item #1000ZS32
Show less
Engine Coolant Thermostat - Mahle TI 226 88
MahlePart # TI 226 88
Engine Coolant Thermostat - Mahle TI 226 88
51 Reviews
$46.99
Edit ZIP code
3-year warranty
90 days free return
Fits 2006-2009 Chevrolet Trailblazer, 2005-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2004-2007 Buick Rainier, 2004-2005 GMC Envoy XUV, 2003-2006 Chevrolet Trailblazer EXT, 2003-2006 GMC Envoy XL, 2002-2005 Chevrolet Trailblazer, 2002-2004 GMC Envoy, 2002-2004 Oldsmobile Bravada, 2002-2002 Chevrolet Trailblazer EXT, 2002-2002 GMC Envoy XL
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet Trailblazer
Item LocatedUnited States
Quantity1
Part interchange
TI 226 88, 33939, 14659, 413-192, TI22688, 12602913, 12620112
item #1000XQX8
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