How to service and repair the thermostat on GMC C3500?

To carry out service and repair the Thermostat, follow the removal of coolant when the Radiator coolant level is beneath the thermostats. On the 5.7l engine, remove the bolts or studs, coolant outlet, Thermostat from the housing, and gasket if necessary. For the 7.4l, in the same way, demolish the bolts or studs and the coolant outlet, Thermostat from the casing, and if required gasket. Clean the Thermostat housing and the sealing surface of the cooling outlet. For 5.7l install the Thermostat into the housing, the gasket if required, and the coolant outlet, then install the bolts or studs and tighten it to 28 nm (21 ft. Lbs.). For the 7.4l, place the Thermostat into the housing along with any gasket and the coolant outlet, then place the bolts or studs and tighten them to 37 nm (27 ft. Lbs.) nsdictionary. Refill the coolant to the cooling system again and run the engine untill the Radiator upper hose gets hot indicating that the thermostate is open. With the engine idling, fill up the Radiator to the bottom of the filler neck and install the Radiator cap with the arrows pointing to the overflow tube. Lastly, check for leaks in the cooling system.

OEM GMC C3500 Thermostat

Engine Coolant Thermostat

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10 Thermostats found

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GMC C3500 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:
- 1996-2000 GMC C3500 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS
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GMC C3500 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:
- 1991-1995 GMC C3500 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 7.4 L GAS
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GMC C3500 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:
- 1996-2000 GMC C3500 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 7.4 L GAS
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GMC C3500 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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1991-1995 GMC C3500 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 5.7 L GAS
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GMC C3500 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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1988-1990 GMC C3500 | Sierra, Sierra SLE, Sierra SLX | 8 Cyl 5.7 L GAS, 8 Cyl 7.4 L GAS
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GMC C3500 Thermostat
Part Number: 14077122
$51.94 MSRP: $103.08
You Save: $51.14 (50%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature; Thermostat, Radiator
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1986 GMC C3500 | Base, High Sierra, Sierra Classic | 8 Cyl 6.2 L DIESEL
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GMC C3500 Thermostat
Part Number: 12559336
$35.26 MSRP: $66.22
You Save: $30.96 (47%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 12554977
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2000 GMC C3500 | Sierra SL, Sierra SLE, Sierra SLT | 8 Cyl 6.5 L DIESEL
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GMC C3500 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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1988-1995 GMC C3500 | 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 C3500 Thermostat
Part Number: 3041390
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1986 GMC C3500 | Base, High Sierra, Sierra Classic | 6 Cyl 4.8 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 7.4 L GAS
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GMC C3500 Thermostat Housing
Part Number: 23502517
Product Specifications
- Other Name: Housing-Engine Coolant Thermostat; Thermostat Housing Cover; Housing, Engine Coolant Thermostat; Housing, Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1988-1990, 1984-1986 GMC C3500 | Base, High Sierra, Sierra, Sierra Classic, Sierra SLE, Sierra SLX | 8 Cyl 6.2 L DIESEL

GMC C3500 Thermostat

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GMC C3500 Thermostat Parts Questions & Experts Answers

Thermostat
12559575
Q: How to service and repair the thermostat on GMC C3500?
A: To carry out service and repair the Thermostat, follow the removal of coolant when the Radiator coolant level is beneath the thermostats. On the 5.7l engine, remove the bolts or studs, coolant outlet, Thermostat from the housing, and gasket if necessary. For the 7.4l, in the same way, demolish the bolts or studs and the coolant outlet, Thermostat from the casing, and if required gasket. Clean the Thermostat housing and the sealing surface of the cooling outlet. For 5.7l install the Thermostat into the housing, the gasket if required, and the coolant outlet, then install the bolts or studs and tighten it to 28 nm (21 ft. Lbs.). For the 7.4l, place the Thermostat into the housing along with any gasket and the coolant outlet, then place the bolts or studs and tighten them to 37 nm (27 ft. Lbs.) nsdictionary. Refill the coolant to the cooling system again and run the engine untill the Radiator upper hose gets hot indicating that the thermostate is open. With the engine idling, fill up the Radiator to the bottom of the filler neck and install the Radiator cap with the arrows pointing to the overflow tube. Lastly, check for leaks in the cooling system.

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