How to replace the thermostat on a 4.2L engine on GMC Envoy?

Start by draining necessary coolant from the Radiator when replacing the Thermostat on a 4.2l engine. Next, remove the generator. Deploy hose clamp pliers (J 38185) to unscrew the outlet hose clamp at the Thermostat Housing before you remove the outlet hose. After removing the bolted Thermostat Housing the technician should separate the housing from the engine block. You must completely clean both the Thermostat Housing surfaces and the engine block's sealing area. Secure the Thermostat Housing onto the engine block then follow the fastener notice before attaching the Thermostat Housing bolts until they achieve 10 n.m (89 lb in) of torque. Before installing the outlet hose onto the Thermostat Housing apply engine coolant to the inside of the Radiator Hose. Close the hose to the Thermostat Housing by tightening the clamp. Affix the generator while you add the instructed coolant and dilution rate into the cooling system. Perform an inspection for fluid leaks from all sealing surfaces when the engine begins operation.

How to replace the engine coolant thermostat (LLV/LLR) (2.9L/3.7L) on GMC Canyon?

Engine coolant Thermostat (LLV/LLR) (2.9L/3.7L) replacement requires cooling system draining before beginning. After raising the vehicle to an appropriate height for access through the wheelhouse you can remove the left wheelhouse liner. You must disconnect the radiator inlet hose from the Thermostat Housing using j 38185 hose clamp pliers. First remove the Thermostat Housing bolts before taking the housing off the engine block. Both the Thermostat Housing and engine block's sealing surface need to be cleaned and inspected. Place the Thermostat Housing onto the engine block before installing its bolts to a torque of 10 nm (89 lb in). By using j 38185 hose clamp pliers the radiator inlet hose can be reconnected to the Thermostat Housing before reinstalling the left wheelhouse liner and lowering the vehicle. The system should be filled with fluid followed by leak detection on all sealing surfaces after the engine operates normally.

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

Starting the replacement process requires removal of the Thermostat Housing. Next, take out the Thermostat. During installation place the new Thermostat into its position before reinstalling the Thermostat Housing.

OEM GMC Thermostat

Engine Coolant Thermostat

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47 Thermostats found

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GMC Thermostat
Part Number: 12514334
$13.52 MSRP: $24.14
You Save: $10.62 (44%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat 195 Degree, Engine Coolant Temperature
Fits the following GMC Models:
- C1500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- C2500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- C3500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.7 L GAS, 8 Cyl 7.4 L GAS
- K1500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- K2500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- K3500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.7 L GAS, 8 Cyl 7.4 L GAS
- Safari | 1987-1990 | Base | 4 Cyl 2.5 L GAS
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GMC Thermostat Unit
Part Number: 24506986
$17.76 MSRP: $33.36
You Save: $15.60 (47%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
- Replaces: 03037747, 10207375, 3037747, 24500253
Fits the following GMC Models:
- Sonoma | 1995 | SL, SLE, SLS | 6 Cyl 4.3 L GAS
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GMC Thermostat Housing
Part Number: 12620112
$56.23 MSRP: $115.56
You Save: $59.33 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 12567750, 12572988, 12602913
Fits the following GMC Models:
- Envoy | 2002-2009 | Denali, SLE, SLT | 6 Cyl 4.2 L GAS, 8 Cyl 5.3 L GAS
- Envoy XL | 2002-2006 | SLE, SLT | 6 Cyl 4.2 L GAS
- Envoy XUV | 2004-2005 | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC 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
Fits the following GMC Models:
- C2500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 7.4 L GAS
- C2500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 7.4 L GAS
- C3500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 7.4 L GAS
- K2500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 7.4 L GAS
- K2500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 7.4 L GAS
- K3500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 7.4 L GAS
- Savana 3500 | 1996-2002 | Base, SLE, SLT | 8 Cyl 7.4 L GAS, 8 Cyl 8.1 L GAS
- Sierra 2500 HD | 2001-2006 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
- Sierra 2500 HD Classic | 2007 | SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
- Sierra 3500 | 2001-2006 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
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GMC Intake Manifold
Part Number: 24577299
$16.76 MSRP: $29.91
You Save: $13.15 (44%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat Unit; Thermostat
- Replaces: 24576634, 10182377, 24577130
Fits the following GMC Models:
- C2500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 7.4 L GAS
- C2500 Suburban | 1992-1995 | Base, SLE, SLT | 8 Cyl 7.4 L GAS
- C3500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 7.4 L GAS
- G3500 | 1992-1996 | Magnavan, Rally, Rally Camper Special, Rally STX, Vandura, Vandura Special | 8 Cyl 7.4 L GAS
- K2500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 7.4 L GAS
- K2500 Suburban | 1992-1995 | Base, SLE, SLT | 8 Cyl 7.4 L GAS
- K3500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 7.4 L GAS
- Sonoma | 1992-2003 | 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 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
Fits the following GMC Models:
- C1500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX, Sierra Special | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- C1500 Suburban | 1992-1995 | Base, SLE, SLT | 8 Cyl 5.7 L GAS
- C2500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
- C2500 Suburban | 1992-1995 | Base, SLE, SLT | 8 Cyl 5.7 L GAS
- C3500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 5.7 L GAS
- G1500 | 1992-1995 | Rally, Rally STX, Vandura | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- G2500 | 1992-1995 | Rally, Rally STX, Vandura | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- G3500 | 1992-1996 | Magnavan, Rally, Rally Camper Special, Rally STX, Vandura, Vandura Special | 6 Cyl 4.3 L GAS, 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
- Jimmy | 1994-1995 | Base, SL, SLE, SLS, SLT | 6 Cyl 4.3 L GAS
- K1500 | 1991-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLS, Sierra SLT, Sierra SLX, Sierra Special, Sierra Sport | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
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GMC 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
Fits the following GMC Models:
- C1500 | 1996-1999 | Sierra GT, Sierra SL, Sierra SLE, Sierra SLT, Sierra Special | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- C1500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 5.7 L GAS
- C2500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
- C2500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 5.7 L GAS
- C3500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
- Jimmy | 1996-2001 | Base, Diamond Edition, Envoy, SL, SLE, SLS, SLT | 6 Cyl 4.3 L GAS
- K1500 | 1996-1999 | Sierra SL, Sierra SLE, Sierra SLT, Sierra Special | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
- K1500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 5.7 L GAS
- K2500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
- K2500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 5.7 L GAS
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GMC 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
Fits the following GMC Models:
- Jimmy | 1994-1995 | Base, SL, SLE, SLS, SLT | 6 Cyl 4.3 L GAS
- Safari | 1992-1995 | Base, GT, SL, SLE, SLT, SLX | 6 Cyl 4.3 L GAS
- Sonoma | 1994-1995 | SL, SLE, SLS | 6 Cyl 4.3 L GAS
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GMC Thermostat
Part Number: 12680456
$22.05 MSRP: $41.40
You Save: $19.35 (47%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
Fits the following GMC Models:
- Sierra 2500 HD | 2017-2024 | AT4, AT4X, Base, Denali, Denali Ultimate, Pro, SLE, SLT | 8 Cyl 6.6 L DIESEL
- Sierra 3500 HD | 2017-2024 | AT4, Base, Denali, Denali Ultimate, Pro, SLE, SLT | 8 Cyl 6.6 L DIESEL
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GMC Thermostat Housing
Part Number: 12618159
$72.33 MSRP: $129.16
You Save: $56.83 (44%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Housing, Engine Coolant Thermostat; Engine Coolant Thermostat Housing; Thermostat Housing Cover
Fits the following GMC Models:
- Terrain | 2010-2017 | Denali, SL, SLE, SLT | 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS
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GMC Thermostat
Part Number: 12559336
$35.26 MSRP: $66.22
You Save: $30.96 (47%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 12554977
Fits the following GMC Models:
- C1500 | 1996-1997 | Sierra GT, Sierra SL, Sierra SLE, Sierra SLT, Sierra Special | 8 Cyl 6.5 L DIESEL
- C1500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- C2500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 6.5 L DIESEL
- C2500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- C3500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 6.5 L DIESEL
- K1500 | 1996-1998 | Sierra SL, Sierra SLE, Sierra SLT, Sierra Special | 8 Cyl 6.5 L DIESEL
- K1500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- K2500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 6.5 L DIESEL
- K2500 Suburban | 1996-1999 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- K3500 | 1996-2000 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 6.5 L DIESEL
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GMC Thermostat Housing
Part Number: 12689039
$73.35 MSRP: $150.72
You Save: $77.37 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 12651113
Fits the following GMC Models:
- Terrain | 2010-2017 | Denali, SLE, SLT | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS, 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS
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GMC Thermostat
Part Number: 10207373
$11.50 MSRP: $20.54
You Save: $9.04 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
Fits the following GMC Models:
- C1500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 6 Cyl 4.3 L GAS
- C2500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 6 Cyl 4.3 L GAS
- G1500 | 1992 | Rally, Rally STX, Vandura | 6 Cyl 4.3 L GAS
- G2500 | 1992 | Rally, Rally STX, Vandura | 6 Cyl 4.3 L GAS
- G3500 | 1992 | Vandura, Vandura Special | 6 Cyl 4.3 L GAS
- Jimmy | 1992-1993 | Base, SLE, SLS, SLT | 6 Cyl 4.3 L GAS
- K1500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 6 Cyl 4.3 L GAS
- K2500 | 1988-1990 | Sierra, Sierra SLE, Sierra SLX | 6 Cyl 4.3 L GAS
- Safari | 1985-1992 | Base, SL, SLE, SLT, SLX | 6 Cyl 4.3 L GAS
- Sonoma | 1992-1993 | Base, SLE, SLS | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS
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GMC Thermostat Housing
Part Number: 12642720
$118.58 MSRP: $214.62
You Save: $96.04 (45%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
Fits the following GMC Models:
- Sierra 2500 HD | 2011-2016 | Base, Denali, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
- Sierra 3500 HD | 2011-2016 | Base, Denali, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC Thermostat Housing
Part Number: 24588515
$91.99 MSRP: $164.26
You Save: $72.27 (44%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat Housing Cover; Thermostat Unit; Thermostat; Thermostat, Engine Coolant Temperature
- Replaces: 12642691
Fits the following GMC Models:
- Canyon | 2016-2022 | All Terrain, AT4, Denali, Elevation, SLE, SLT | 4 Cyl 2.8 L DIESEL
- Savana 2500 | 2017-2022 | Base, LS, LT | 4 Cyl 2.8 L DIESEL
- Savana 3500 | 2017-2022 | Base, LS, LT | 4 Cyl 2.8 L DIESEL
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GMC Thermostat
Part Number: 12559337
$28.06 MSRP: $52.70
You Save: $24.64 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 12551497
Fits the following GMC Models:
- G2500 | 1994-1995 | Rally, Rally STX, Vandura | 8 Cyl 6.5 L DIESEL
- G3500 | 1994-1996 | Magnavan, Rally, Rally Camper Special, Rally STX, Vandura, Vandura Special | 8 Cyl 6.5 L DIESEL
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GMC Thermostat
Part Number: 12572866
$12.00 MSRP: $21.42
You Save: $9.42 (44%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant
Fits the following GMC Models:
- Acadia | 2007 | SLE, SLT | 6 Cyl 3.6 L GAS
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GMC Thermostat Housing
Part Number: 12673413
$101.54 MSRP: $208.66
You Save: $107.12 (52%)
ADD TO CART
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Water Inlet; Thermostat Unit; Housing, Engine Coolant Thermostat
- Replaced by: 25205818
Fits the following GMC Models:
- Terrain | 2018-2024 | AT4, Denali, SL, SLE, SLT | 4 Cyl 1.5 L GAS
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GMC 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
Fits the following GMC Models:
- Savana 2500 | 2006-2008 | Base | 8 Cyl 6.6 L DIESEL
- Savana 3500 | 2006-2008 | Base | 8 Cyl 6.6 L DIESEL
- Sierra 2500 HD | 2007 | SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
- Sierra 3500 HD | 2007 | SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC 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
Fits the following GMC Models:
- C1500 | 1988-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX, Sierra Special | 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL
- C1500 Suburban | 1995 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- C2500 | 1988-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL
- C2500 Suburban | 1994-1995 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- C3500 | 1988-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL
- K1500 | 1988-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLS, Sierra SLT, Sierra SLX, Sierra Special, Sierra Sport | 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL
- K1500 Suburban | 1995 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- K2500 | 1988-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL
- K2500 Suburban | 1994-1995 | Base, SLE, SLT | 8 Cyl 6.5 L DIESEL
- K3500 | 1988-1995 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL
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GMC Thermostat Parts Questions & Experts Answers

Thermostat Unit
12600171
Q: How to replace the thermostat on a 4.2L engine on GMC Envoy?
A: Start by draining necessary coolant from the Radiator when replacing the Thermostat on a 4.2l engine. Next, remove the generator. Deploy hose clamp pliers (J 38185) to unscrew the outlet hose clamp at the Thermostat Housing before you remove the outlet hose. After removing the bolted Thermostat Housing the technician should separate the housing from the engine block. You must completely clean both the Thermostat Housing surfaces and the engine block's sealing area. Secure the Thermostat Housing onto the engine block then follow the fastener notice before attaching the Thermostat Housing bolts until they achieve 10 n.m (89 lb in) of torque. Before installing the outlet hose onto the Thermostat Housing apply engine coolant to the inside of the Radiator Hose. Close the hose to the Thermostat Housing by tightening the clamp. Affix the generator while you add the instructed coolant and dilution rate into the cooling system. Perform an inspection for fluid leaks from all sealing surfaces when the engine begins operation.
Thermostat Housing
12622316
Q: How to replace the engine coolant thermostat (LLV/LLR) (2.9L/3.7L) on GMC Canyon?
A: Engine coolant Thermostat (LLV/LLR) (2.9L/3.7L) replacement requires cooling system draining before beginning. After raising the vehicle to an appropriate height for access through the wheelhouse you can remove the left wheelhouse liner. You must disconnect the radiator inlet hose from the Thermostat Housing using j 38185 hose clamp pliers. First remove the Thermostat Housing bolts before taking the housing off the engine block. Both the Thermostat Housing and engine block's sealing surface need to be cleaned and inspected. Place the Thermostat Housing onto the engine block before installing its bolts to a torque of 10 nm (89 lb in). By using j 38185 hose clamp pliers the radiator inlet hose can be reconnected to the Thermostat Housing before reinstalling the left wheelhouse liner and lowering the vehicle. The system should be filled with fluid followed by leak detection on all sealing surfaces after the engine operates normally.
Thermostat
89018168
Q: How to replace the engine coolant thermostat on GMC Sierra 1500?
A: Starting the replacement process requires removal of the Thermostat Housing. Next, take out the Thermostat. During installation place the new Thermostat into its position before reinstalling the Thermostat Housing.