How to replace the thermostat on the 8.1L engine on GMC Sierra 3500?

The replacement of the thermostat for an 8.1L engine begins with draining the cooling system. You should move the inlet hose clamp to the water outlet before removing the inlet hose from this location. Begin by unscrewing the two water outlet bolts so you can detach the water outlet . You can then remove the thermostat for replacement. Begin the installation process by adding the thermostat then the water outlet . Set all water outlet bolts to 30 Nm (22 ft. lbs.) before reattaching the inlet hose to the water outlet ensuring the hose clamp faces the outlet. Finally, fill the cooling system.

OEM GMC Sierra 3500 Thermostat

Engine Coolant Thermostat

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5 Thermostats found

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GMC Sierra 3500 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:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC Sierra 3500 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:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC Sierra 3500 Thermostat Part Number: 12559575
$17.99 MSRP: $33.78
You Save: $15.79 (47%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 12559269, 12559573, 10210450
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
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GMC Sierra 3500 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:
- 2004-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
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GMC Sierra 3500 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:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL

GMC Sierra 3500 Thermostat

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GMC Sierra 3500 Thermostat Parts Questions & Experts Answers

Thermostat Unit
12600171
Q: How to replace the thermostat on the 8.1L engine on GMC Sierra 3500?
A:
The replacement of the thermostat for an 8.1L engine begins with draining the cooling system. You should move the inlet hose clamp to the water outlet before removing the inlet hose from this location. Begin by unscrewing the two water outlet bolts so you can detach the water outlet . You can then remove the thermostat for replacement. Begin the installation process by adding the thermostat then the water outlet . Set all water outlet bolts to 30 Nm (22 ft. lbs.) before reattaching the inlet hose to the water outlet ensuring the hose clamp faces the outlet. Finally, fill the cooling system.