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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Chevrolet Blazer Thermostat Unit
Part Number: 24505924
$23.98 MSRP: $47.60
You Save: $23.62 (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
$29.24 MSRP: $54.92
You Save: $25.68 (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
$14.31 MSRP: $26.88
You Save: $12.57 (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
$51.94 MSRP: $103.08
You Save: $51.14 (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
$66.48 MSRP: $136.58
You Save: $70.10 (52%)
Ships in 1-2 Business Days
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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

Our website offers an extensive catalog of genuine Chevrolet Blazer Thermostat at unbeatable prices. Every OEM Chevrolet Blazer Thermostat comes with a manufacturer's warranty, an easy return policy, and rapid delivery service. Don't miss out on this great opportunity!

Chevrolet Blazer Thermostat Parts Questions & Experts Answers

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.

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