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
$29.83 MSRP: $56.02
You Save: $26.19 (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 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
$14.60 MSRP: $27.42
You Save: $12.82 (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
$52.97 MSRP: $105.14
You Save: $52.17 (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 Intake Manifold Part Number: 24577299
$16.76 MSRP: $29.91
You Save: $13.15 (44%)
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: 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

Want to cut long-term maintenance and repair costs? Choose OEM Thermostat. Those parts deliver top durability you can trust. On our site, you'll find a huge catalog of genuine GMC C3500 parts. Prices are unbeatable, so you can keep more in your pocket. Every OEM GMC C3500 Thermostat includes a manufacturer's warranty. You can also get an easy return policy that keeps buying risk free. Fast delivery, get your car on the road quickly. It's simple to search, compare, and order. Stop guessing about quality or fit. Order today and save with parts that last.

The Thermostat is fully used for the car cooling system and it has a good reputation about its quality and efficiency. A vehicle cooling system, Thermostat is a closed-loop control mechanism that controls the desired temperature of an engine. This thorough function promotes productivity and security, which is why it plays a critical role in the GMC C3500's functionality. Satisfactory with the numerous C3500 models manufactured and released since the year 1991, the Thermostat is designed to serve the purpose that is expected of it, depending on the version of the model that is being used. It is a refined part of the car architecture and provides fast reaction in terms of protecting the engine, which is a major benefit in engine longevity. The automotive industry has been characterized by the introduction of numerous versions of Thermostat due to its tough build and engineering to allow it to serve its Clients for a long time. Special mention has to be given to the AUTOTAG feature Since the operation of this thermostat adapts well to various driving conditions GMC C3500 drivers are relieved when they are behind the wheel. Some of the other features of the Thermostat include, flexibility, safety, and efficiency, and therefore it acts as an attestation of General Motors. Whether one is driving through congested urban traffic or overworking the Thermostat for tough applications, this part is crucial for regulating the engine temperature and boosting the car's efficiency and durability.

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.