How to replace the engine coolant thermostat (LU3) on GMC Sierra 1500?

Engine coolant Thermostat (LU3) replacement starts with the water outlet tube removal followed by the water outlet and Thermostat removal. The installation process begins with cleaning both the water outlet surface and intakes manifold surface and removing the existing o-ring seal for disposal. Start Thermostat replacement by mounting a fresh o-ring seal before adding the Thermostat component. Follow this order for installation by adding the water outlet tube followed by the water outlet and finishing with the water outlet tube.

OEM GMC Sierra 1500 Thermostat

Engine Coolant Thermostat

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5 Thermostats found

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GMC Sierra 1500 Thermostat Housing
Part Number: 12674639
$57.18 MSRP: $120.68
You Save: $63.50 (53%)
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Product Specifications
- Other Name: Outlet Assembly-Water Pump (W/Thermostat); Engine Coolant Thermostat Housing; Thermostat Housing Cover; Water Outlet; Thermostat; Outlet, Engine Coolant Pump
- Replaced by: 19474058
- Replaces: 12666569, 12671393, 12657137
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2019 GMC Sierra 1500 | AT4, Base, Denali, Elevation, SLE, SLT | 6 Cyl 4.3 L FLEX, 6 Cyl 4.3 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 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:
- 1999-2013 GMC Sierra 1500 | Base, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS
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GMC Sierra 1500 Thermostat
Part Number: 89018168
$39.67 MSRP: $78.71
You Save: $39.04 (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:
- 2019-2023, 2007-2013 GMC Sierra 1500 | AT4, AT4X, Base, Denali, Denali Ultimate, Elevation, Hybrid, Pro, SL, SLE, SLT, WT, XFE | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Thermostat Unit
Part Number: 12600171
$22.45 MSRP: $42.18
You Save: $19.73 (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 1500 | Base, Denali, Hybrid, SL, SLE, SLT, WT | 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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GMC Sierra 1500 Thermostat
Part Number: 19420815
$39.50 MSRP: $78.40
You Save: $38.90 (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:
- 2022-2023 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS

GMC Sierra 1500 Thermostat

Our website offers an extensive catalog of genuine GMC Sierra 1500 Thermostat at unbeatable prices. Every OEM GMC Sierra 1500 Thermostat comes with a manufacturer's warranty, an easy return policy, and rapid delivery service. Don't miss out on this great opportunity!

GMC Sierra 1500 Thermostat Parts Questions & Experts Answers

Thermostat
89018168
Q: How to replace the engine coolant thermostat (LU3) on GMC Sierra 1500?
A: Engine coolant Thermostat (LU3) replacement starts with the water outlet tube removal followed by the water outlet and Thermostat removal. The installation process begins with cleaning both the water outlet surface and intakes manifold surface and removing the existing o-ring seal for disposal. Start Thermostat replacement by mounting a fresh o-ring seal before adding the Thermostat component. Follow this order for installation by adding the water outlet tube followed by the water outlet and finishing with the water outlet tube.