How to replace the thermostat in a 4.3L engine on Chevrolet Blazer?

The replacement process for the 4.3l engine Thermostat begins when you drain part of the cooling system. Start by removing the outlet duct from the air cleaner before unscrewing all throttle body bracket nuts to relocate the bracket. The procedure starts by discarding the lower Intake Manifold water outlet housing mounting bolts before separating this housing from the manifold to set it safely aside. First clean both sealing surfaces of the water outlet housing and lower Intake Manifold before you put the new gasket or o-ring and Thermostat into place. All installation parts require complete cleaning to avoid leakage between sealing surfaces. Attach the Thermostat with either a new gasket or o-ring before connecting the water outlet housing to the lower Intake Manifold using the directions in fastener notice in service precautions. Fasten water outlet housing mounting bolts to 19 nm (14 ft. Lbs.) before reattaching the throttle body bracket which requires bracket nuts to be tightened to 10 nm (89 inch lbs.). Before you finish you must fill the cooling system while inspecting it for leakages.

OEM Chevrolet Blazer Thermostat

Engine Coolant Thermostat

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8 Thermostats found

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Chevrolet Blazer Thermostat Unit Part Number: 24505924
$24.47 MSRP: $48.56
You Save: $24.09 (50%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant (W/Gasket); Thermostat; Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 Chevrolet Blazer | Base, LT | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Thermostat Part Number: 12632948
$29.83 MSRP: $56.02
You Save: $26.19 (47%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 12257859, 12563335, 12557859, 12597583, 12551472
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2005 Chevrolet Blazer | Base, LS, LT, Trailblazer, Xtreme, ZR2 | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Thermostat Part Number: 10190925
$14.60 MSRP: $27.42
You Save: $12.82 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 10147886, 10190927
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-1995 Chevrolet Blazer | Base, Cheyenne, Silverado, Silverado Sport | 6 Cyl 4.3 L GAS, 8 Cyl 5.7 L GAS
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Chevrolet Blazer Thermostat Part Number: 14077122
$52.97 MSRP: $105.14
You Save: $52.17 (50%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature; Thermostat, Radiator
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1987 Chevrolet Blazer | Custom Deluxe, Silverado | 8 Cyl 6.2 L DIESEL
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Chevrolet Blazer Thermostat Housing Part Number: 25201447
$67.81 MSRP: $139.32
You Save: $71.51 (52%)
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Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Thermostat Gasket; Thermostat; Thermostat Cover; Water Inlet; Housing, Engine Coolant Thermostat
- Replaces: 12651603
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 Chevrolet Blazer | Base, L, LT | 4 Cyl 2.5 L GAS
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Chevrolet Blazer Thermostat Part Number: 12559338
$39.32 MSRP: $70.21
You Save: $30.89 (44%)
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 10154622, 12551496
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994 Chevrolet Blazer | Base, Silverado, Silverado Sport | 8 Cyl 6.5 L DIESEL
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Chevrolet Blazer Thermostat Part Number: 3041390
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1987 Chevrolet Blazer | Custom Deluxe, Silverado | 8 Cyl 5.0 L GAS
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Chevrolet Blazer Thermostat Housing Part Number: 23502517
Product Specifications
- Other Name: Housing-Engine Coolant Thermostat; Thermostat Housing Cover; Housing, Engine Coolant Thermostat; Housing, Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1987-1990 Chevrolet Blazer | Custom Deluxe, Scottsdale, Silverado | 8 Cyl 6.2 L DIESEL

Chevrolet Blazer Thermostat

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The Chevrolet Blazer Thermostat is a part of the vehicle cooling system found often around the area of the radiator. It main use is to control the temperature of the engine to make sure the temperature is ideal for the engine. Thermostats are control gadgets that determine and regulate temperatures that are enclosed and which have a desired point these are crucial in homes as well as industries. Different kinds of thermostats have been used in the past years mechanical thermostat include bimetallic strip, wax pellets, pneumatic thermostats include control tube containing air. Such innovations have contributed to better management of temperature in Chevrolet Blazer cars making the cars more comfortable as well as increasing their performance.

Chevrolet Blazer Thermostat Parts and Q&A

Thermostat
12632948
Q: How to replace the thermostat in a 4.3L engine on Chevrolet Blazer?
A:
The replacement process for the 4.3l engine Thermostat begins when you drain part of the cooling system. Start by removing the outlet duct from the air cleaner before unscrewing all throttle body bracket nuts to relocate the bracket. The procedure starts by discarding the lower Intake Manifold water outlet housing mounting bolts before separating this housing from the manifold to set it safely aside. First clean both sealing surfaces of the water outlet housing and lower Intake Manifold before you put the new gasket or o-ring and Thermostat into place. All installation parts require complete cleaning to avoid leakage between sealing surfaces. Attach the Thermostat with either a new gasket or o-ring before connecting the water outlet housing to the lower Intake Manifold using the directions in fastener notice in service precautions. Fasten water outlet housing mounting bolts to 19 nm (14 ft. Lbs.) before reattaching the throttle body bracket which requires bracket nuts to be tightened to 10 nm (89 inch lbs.). Before you finish you must fill the cooling system while inspecting it for leakages.