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2003 GMC Sierra 3500
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OEM (Genuine) 2003 GMC Sierra 3500 Inlet Assembly
PartNumber: 12600172
Product Specifications- Notes: 4.8, 5.3 & 6.0 Liter
- Item Dimensions: 6.4 x 4.2 x 4.2 inches
- Item Weight: 0.90 Pounds
- Fitment Type: Direct Replacement
- Replaces: 12581594
- Part Description: 2003 GMC Sierra 3500 Inlet Assembly
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
$43.57 MSRP:$82.23You Save: $38.66 (48%)
Dorman® Engine Coolant Thermostat Housing Assembly for 2003 GMC Sierra 3500
PartNumber: 902-2836Product Specifications- Notes: wo/Water Pump Casting# 12562459; Use If Original Water Pump Replaced w/Later Design; Includes Thermostat
- OE Part Number: 12600172, 12581594, 12568911, 8125815940, 8125689110, 8126001720
- Package Contents: 1 Thermostat Housing
- UPC: 889245054883
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing Assembly
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
$39.33
Gates® Engine Coolant Water Outlet for 2003 GMC Sierra 3500
PartNumber: CO34923Product Specifications- Notes: Thermostat Cover; W/GM Updated Replacement Water Pump
- By-Pass Holes: No
- Material: Cast Aluminum
- Number of Bolt Holes: 2
- Number of Gaskets: 0
- Number of Seals: 0
- OE Exact: Yes
- Outlet Inside Diameter 1: 1.194"
- Outlet Outside Diameter 1: 1.565"
- Type: Coolant Outlet
- UPC: 770075795179
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Water Outlet
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
$24.06
OEM (Genuine) 2003 GMC Sierra 3500 Thermostat Unit
PartNumber: 12571261
Product Specifications- Notes: All Models; 4.8l, 5.3l, 6.0l; Includes Thermostat
- Other Names: Thermostat Housing, Thermostat Unit
- Item Dimensions: 6.5 x 4.3 x 4.2 inches
- Item Weight: 1.10 Pounds
- Fitment Type: Direct Replacement
- Replaces: 12561157, 12562740
- Part Description: 2003 GMC Sierra 3500 Thermostat Unit
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
$41.61 MSRP:$78.51You Save: $36.90 (48%)
Four Seasons® Engine Coolant Water Outlet W O Thermostat for 2003 GMC Sierra 3500
PartNumber: 85253Product Specifications- Notes: Outlet
- Bolt Hole Center To Bolt Hole Center: 3.125
- Gasket or Seal Included: Not Included
- Inlet Dia. IN: 2.003
- Material: Aluminum
- Maximum Height: 2.507
- Meets / Exceeds OEM: Yes
- Mnt Flange Width IN: 0.791
- Style: w/o Thermostat
- Symetrical Base: No
- Thermostat Included: Not Included
- UPC: 096361852532
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Water Outlet W O Thermostat
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.6L
$64.13
Dorman® Engine Coolant Thermostat Housing for 2003 GMC Sierra 3500
PartNumber: 902-2068Product Specifications- Notes: Cover
- Air Vent (Bleeder Valve): Yes
- Bolt Hole Diameter: 0.313"
- Bolt Hole Quantity: 4
- Bolts Included: No
- Color/Finish: Natural
- Material: Metal
- O Rings Included: Not Required
- OE Part Number: 97225886
- Outlet Diameter: 2"
- Thermostat Included: No
- UPC: 885484546646
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.6L
$37.06
OEM (Genuine) 2003 GMC Sierra 3500 Thermostat Housing
PartNumber: 12578330
Product Specifications- Notes: All Models; 8.1l; Engine Cooling Pipe
- Other Names: Thermostat Housing
- Item Dimensions: 48.3 x 11.6 x 7.3 inches
- Item Weight: 15.30 Pounds
- Fitment Type: Direct Replacement
- Replaces: 12573197
- Part Description: 2003 GMC Sierra 3500 Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
$205.37 MSRP:$326.07You Save: $120.70 (38%)
Four Seasons® Engine Coolant Thermostat Housing W O Thermostat for 2003 GMC Sierra 3500
PartNumber: 85254Product Specifications- Notes: w/o Thermostat
- Bolt Hole Center To Bolt Hole Center: 3.000
- Flange Thickness: 0.395
- Gasket or Seal Included: Included
- Inlet Port Diameter: 1.307
- Material: Aluminum
- Meets / Exceeds OEM: Yes
- Overall Height IN: 2.51
- Style: w/o Thermostat
- Symetrical Base: Yes
- Thermostat Included: Not Included
- UPC: 096361852549
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing W O Thermostat
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
$30.40
Four Seasons® Engine Coolant Water Outlet W O Thermostat for 2003 GMC Sierra 3500
PartNumber: 85191Product Specifications- Notes: Outlet
- Bolt Hole Center To Bolt Hole Center: 2.375
- Gasket or Seal Included: Included
- Material: Aluminum
- Meets / Exceeds OEM: Yes
- Style: w/o Thermostat
- Symetrical Base: Yes
- Thermostat Included: Not Included
- UPC: 096361851917
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Water Outlet W O Thermostat
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 8.1L
$24.98
OEM (Genuine) 2003 GMC Sierra 3500 Thermostat Cover
PartNumber: 97225886
Product Specifications- Notes: 6.6 Liter Turbo Diesel
- Other Names: Thermostat Cover
- Item Dimensions: 6.6 x 3.5 x 3.9 inches
- Item Weight: 1.10 Pounds
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Thermostat Cover
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
$343.18 MSRP:$544.88You Save: $201.70 (38%)
Dorman® Engine Coolant Thermostat Housing for 2003 GMC Sierra 3500
PartNumber: 902-2701Product Specifications- Notes: Incls Thermostat; w/Water Pump Casting# 12562459; w/Thermostat Retainer Brackets; 160 Degrees Fahrenheit
- Bleeder Hole: No
- Bolt Hole Center To Bolt Hole Center: 3"; 0.87"
- Bolt Hole Quantity: 3
- Color/Finish: Natural
- Flange Length: 4.39"
- Flange Thickness: 0.4"
- Flange Width: 2.701"
- Gasket Type: Gasket
- Grade Type: Regular
- Inside Diameter: 1.236"
- Material: Metal
- Mounting Hardware Included: No
- OE Part Number: 12571261, 8125712610
- Outlet Port Quantity: 1
- Thermostat Included: No
- Thermostat Opening Temperature (F): 160 Degrees
- UPC: 889245054906
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
$22.81
Dorman® Engine Coolant Thermostat Housing for 2003 GMC Sierra 3500
PartNumber: 902-836Product Specifications- Notes: Cover; Does Not Incl Thermostat; wo/Water Pump Casting# 12562459; Use If Original Water Pump Replaced w/Later Design
- Air Vent (Bleeder Valve): No
- Bolt Hole Diameter: 0.313"
- Bolt Hole Quantity: 2
- Bolts Included: No
- Color/Finish: Natural
- Gasket or Seal Included: No
- Housing Neck Angle (°): 30 Degree
- Material: Metal
- O Rings Included: Not Required
- OE Part Number: 12600172, 12581594, 12568911
- Outlet Diameter: 1.64"
- Thermostat Included: No
- UPC: 037495607070
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
$17.55
Dorman® Engine Coolant Thermostat Housing for 2003 GMC Sierra 3500
PartNumber: 902-2060Product Specifications- Notes: Cover
- Air Vent (Bleeder Valve): No
- Bolt Hole Diameter: 0.313"
- Bolt Hole Quantity: 3
- Bolts Included: No
- Color/Finish: Natural
- Housing Neck Angle (°): 180 Degree
- Material: Metal
- O Rings Included: Not Required
- OE Part Number: 12559861
- Outlet Diameter: 1.5"
- Thermostat Included: No
- UPC: 885484546486
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 8.1L
$20.43
Dorman® Engine Coolant Thermostat Housing for 2003 GMC Sierra 3500
PartNumber: 902-700Product Specifications- Notes: w/Water Pump Casting# 12562459; w/Thermostat Retainer Brackets; Incls 186 Fahrenheit Degree Thermostat
- Bleeder Hole: No
- Bolt Hole Center To Bolt Hole Center: 2.726"; 3.547"
- Bolt Hole Quantity: 2
- Color/Finish: Natural
- Flange Length: 4.39"
- Flange Thickness: 0.399"
- Flange Width: 2.701"
- Gasket Type: Gasket
- Grade Type: Regular
- Inside Diameter: 1.236"
- Material: Metal
- Mounting Hardware Included: No
- OE Part Number: 12571261
- Outlet Port Quantity: 1
- Thermostat Opening Temperature (F): 186 Degrees
- UPC: 037495708449
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
$13.19
Dorman® Engine Coolant Thermostat Housing for 2003 GMC Sierra 3500
PartNumber: 902-2700Product Specifications- Notes: Incls Thermostat; w/Water Pump Casting# 12562459; w/Thermostat Retainer Brackets; 180 Degrees Fahrenheit
- Bleeder Hole: No
- Bolt Hole Center To Bolt Hole Center: 3"
- Bolt Hole Quantity: 3
- Color: Natural
- Flange Length: 4.376"
- Flange Thickness: 0.35"
- Flange Width: 2.75"
- Gasket or Seal Included: Yes
- Gasket Type: O Ring
- Grade Type: Regular
- Inside Diameter: 1.3"
- Material: Aluminum
- Mounting Hardware Included: No
- Outlet Port Quantity: 1
- Package Contents: 1 Thermostat Housing; 1 Thermostat; 1 O-Ring
- Thermostat Included: Yes
- Thermostat Opening Temperature: 180 Deg. F
- UPC: 889245055224
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Thermostat Housing
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.0L
OEM (Genuine) 2003 GMC Sierra 3500 Housing-Engine Coolant Thermostat
PartNumber: 97383583
Product Specifications- Notes: All Models; 6.6l; 6.6 Liter Turbo Diesel
- Other Names: Thermostat Housing
- Item Dimensions: 21.0 x 7.2 x 5.7 inches
- Item Weight: 2.80 Pounds
- Fitment Type: Direct Replacement
- Replaces: 97222428
- Part Description: 2003 GMC Sierra 3500 Housing-Engine Coolant Thermostat
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
OEM (Genuine) 2003 GMC Sierra 3500 Engine Coolant Outlet
PartNumber: 12559861
Product Specifications- Notes: All Models; 8.1l; Water Outlet; 8.1 Liter Gas
- Other Names: Thermostat Housing, Thermostat Outlet
- Item Dimensions: 4.4 x 4.5 x 4.2 inches
- Item Weight: 0.70 Pounds
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Engine Coolant Outlet
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
FAQ for Thermostat Housing Repair
Q: How to install the thermostat housing?
A:
You can install the thermostat and thermostat housing to the water pump, the thermostat housing bolts, and the radiator outlet hose.
By Bob
GM Specialist
01/11/2022Q: How to remove the thermostat housing?
A:
You can remove the radiator outlet hose, the water pump inlet bolts, and the water pump inlet and thermostat from the water pump.
By Bob
GM Specialist
01/11/2022Q: What is the recommended bolt torque for the thermostat housing?
A:
The recommended bolt torque is 15 Nm (11 ft. lbs.).
By Bob
GM Specialist
01/11/2022