How to replace the thermostat in a 4.3L engine on Chevrolet Express 2500?

To exchange a Thermostat in a 4.3l engine, first remove the air cleaner and duct assembly and also partially drain the coolant and the coolant recovery container. Unplug the Radiator Hose from the Thermostat Housing. Move the bolts secured in the Thermostat Housing to the Thermostat apart; then, remove the Thermostat Housing and the Thermostat also. Sand the gasket mating surfaces and do not install the new Thermostat. Now, connect the Thermostat Housing with the Intake Manifold and bolt it using the bolts that you tighten to a torque of 25 nm (18 ft. Lbs.). Replace the Radiator Hose onto the Thermostat Housing, replace the coolant recovery reservoir, and replace the air cleaner and duct. Top off the cooling system, bleed the air in the system, and lastly, inspect the Thermostat Housing as well as the gasket for any cracks in the cooling system due to coolant leaks.

OEM Chevrolet Express 2500 Thermostat

Engine Coolant Thermostat

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13 Thermostats found

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Chevrolet Express 2500 Thermostat Part Number: 97241129
$36.18 MSRP: $71.82
You Save: $35.64 (50%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2016 Chevrolet Express 2500 | Base, LS, LT | 8 Cyl 6.6 L DIESEL
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Chevrolet Express 2500 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:
- 1996-2006 Chevrolet Express 2500 | Base, LS | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L BI-FUEL, 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
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Chevrolet Express 2500 Thermostat Part Number: 97241130
$33.42 MSRP: $62.76
You Save: $29.34 (47%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2016 Chevrolet Express 2500 | Base, LS, LT | 8 Cyl 6.6 L DIESEL
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Chevrolet Express 2500 Thermostat Part Number: 89018168
$36.41 MSRP: $72.25
You Save: $35.84 (50%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Engine Coolant Temperature
- Replaces: 89017851
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2023 Chevrolet Express 2500 | Base, LS, LT | 6 Cyl 4.3 L FLEX, 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L FLEX, 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L GAS
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Chevrolet Express 2500 Thermostat Unit Part Number: 12600171
$24.02 MSRP: $45.12
You Save: $21.10 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
- Replaces: 12581595
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2007 Chevrolet Express 2500 | Base, LS, LT | 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
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Chevrolet Express 2500 Thermostat Housing Part Number: 24588515
$84.41 MSRP: $167.54
You Save: $83.13 (50%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat Housing Cover; Thermostat Unit; Thermostat; Thermostat, Engine Coolant Temperature
- Replaces: 12642691
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2017-2022 Chevrolet Express 2500 | Base, LS, LT | 4 Cyl 2.8 L DIESEL
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Chevrolet Express 2500 Thermostat Part Number: 19420815
$40.28 MSRP: $79.96
You Save: $39.68 (50%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Kit, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2022-2024 Chevrolet Express 2500 | Base, LS, LT | 6 Cyl 4.3 L FLEX, 6 Cyl 4.3 L GAS, 8 Cyl 6.6 L GAS
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Chevrolet Express 2500 Thermostat Part Number: 12559336
$35.26 MSRP: $66.22
You Save: $30.96 (47%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 12554977
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Express 2500 | Base, LS | 8 Cyl 6.5 L DIESEL
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Chevrolet Express 2500 Thermostat Housing Part Number: 97383583
Product Specifications
- Other Name: Housing-Engine Coolant Thermostat; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 97222428
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 Chevrolet Express 2500 | Base, LS, LT | 8 Cyl 6.6 L DIESEL
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Chevrolet Express 2500 Thermostat Housing Part Number: 12553405
Product Specifications
- Other Name: Housing, Engine Coolant Thermostat; Thermostat Housing Cover
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Express 2500 | Base, LS | 8 Cyl 6.5 L DIESEL
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Chevrolet Express 2500 Thermostat Housing Part Number: 97383685
$228.06 MSRP: $358.84
You Save: $130.78 (37%)
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2008 Chevrolet Express 2500 | Base, LS, LT | 8 Cyl 6.6 L DIESEL
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Chevrolet Express 2500 Thermostat Housing Part Number: 98082690
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009 Chevrolet Express 2500 | Base | 8 Cyl 6.6 L DIESEL
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Chevrolet Express 2500 Thermostat Housing Part Number: 12642719
$110.58 MSRP: $197.45
You Save: $86.87 (44%)
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 12637657
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2016 Chevrolet Express 2500 | Base | 8 Cyl 6.6 L DIESEL

Chevrolet Express 2500 Thermostat

Want to cut long-term maintenance and repair costs? Choose OEM Thermostat. Those parts deliver top durability you can trust. On our site, you'll find a huge catalog of genuine Chevrolet Express 2500 parts. Prices are unbeatable, so you can keep more in your pocket. Every OEM Chevrolet Express 2500 Thermostat includes a manufacturer's warranty. You can also get an easy return policy that keeps buying risk free. Fast delivery, get your car on the road quickly. It's simple to search, compare, and order. Stop guessing about quality or fit. Order today and save with parts that last.

Chevrolet Express 2500 Thermostat Parts Questions & Experts Answers

Thermostat Unit
12600171
Q: How to replace the thermostat in a 4.3L engine on Chevrolet Express 2500?
A:
To exchange a Thermostat in a 4.3l engine, first remove the air cleaner and duct assembly and also partially drain the coolant and the coolant recovery container. Unplug the Radiator Hose from the Thermostat Housing. Move the bolts secured in the Thermostat Housing to the Thermostat apart; then, remove the Thermostat Housing and the Thermostat also. Sand the gasket mating surfaces and do not install the new Thermostat. Now, connect the Thermostat Housing with the Intake Manifold and bolt it using the bolts that you tighten to a torque of 25 nm (18 ft. Lbs.). Replace the Radiator Hose onto the Thermostat Housing, replace the coolant recovery reservoir, and replace the air cleaner and duct. Top off the cooling system, bleed the air in the system, and lastly, inspect the Thermostat Housing as well as the gasket for any cracks in the cooling system due to coolant leaks.