How to replace the thermostat in a 4.3L engine on GMC Sonoma?

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 GMC Sonoma Thermostat

Engine Coolant Thermostat

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GMC Sonoma 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:
- 1994-1995 GMC Sonoma | SL, SLE, SLS | 6 Cyl 4.3 L GAS
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GMC Sonoma 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:
- 1996-2004 GMC Sonoma | SL, SLE, SLS | 6 Cyl 4.3 L GAS
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GMC Sonoma Intake Manifold
Part Number: 24577299
$16.76 MSRP: $29.91
You Save: $13.15 (44%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat Unit; Thermostat
- Replaces: 24576634, 10182377, 24577130
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-2003 GMC Sonoma | Base, SL, SLE, SLS | 4 Cyl 2.2 L FLEX, 4 Cyl 2.2 L GAS, 6 Cyl 2.8 L GAS
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GMC Sonoma Thermostat
Part Number: 10190925
$14.31 MSRP: $26.88
You Save: $12.57 (47%)
Ships in 1-2 Business Days
ADD TO CART
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:
- 1994-1995 GMC Sonoma | SL, SLE, SLS | 6 Cyl 4.3 L GAS
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GMC Sonoma Thermostat Unit
Part Number: 24506986
$17.76 MSRP: $33.36
You Save: $15.60 (47%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
- Replaces: 03037747, 10207375, 3037747, 24500253
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 GMC Sonoma | SL, SLE, SLS | 6 Cyl 4.3 L GAS
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GMC Sonoma Thermostat
Part Number: 10207373
$11.50 MSRP: $20.54
You Save: $9.04 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-1993 GMC Sonoma | Base, SLE, SLS | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS
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GMC Sonoma Thermostat Housing
Part Number: 12511714
$43.38 MSRP: $77.46
You Save: $34.08 (44%)
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:
- 1992-1993 GMC Sonoma | Base, SLE, SLS | 4 Cyl 2.5 L GAS

GMC Sonoma Thermostat

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GMC Sonoma Thermostat Parts Questions & Experts Answers

Thermostat
12632948
Q: How to replace the thermostat in a 4.3L engine on GMC Sonoma?
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.