Product Description:
Hawks Motorsports is pleased to offer our clients the following.
GM Genuine Parts 12674634 combines the engine-coolant thermostat and water-pump outlet housing for compatible LT-engine applications. Match the exact housing configuration and VIN before selecting this cooling-system service assembly.
| Producer | GM Genuine Parts |
| Condition | New |
| Correct GM number | 12674634 |
| ACDelco reference | 15-11113 |
| Component | Water-pump outlet housing with thermostat |
| Start-to-open temperature | 194 degrees F / 90 degrees C |
| Gasket | One manufacturer-listed sealing gasket |
| Year | Verified application / required configuration |
|---|---|
| 2016 | Camaro SS LT1 6.2L; Cadillac CTS-V LT4; VIN / housing configuration verification required |
| 2017 | Camaro SS LT1 6.2L / ZL1 LT4; Cadillac CTS-V LT4; Corvette LT1 / LT4; VIN / housing configuration verification required |
| 2018 | Camaro SS LT1 6.2L / ZL1 LT4; Cadillac CTS-V LT4; Corvette LT1 / LT4; VIN / housing configuration verification required |
| 2019 | Camaro SS LT1 6.2L / ZL1 LT4; Cadillac CTS-V LT4; Corvette LT1 / LT4 / LT5 ZR1; VIN / housing configuration verification required |
| 2020 | Camaro SS LT1 6.2L / ZL1 LT4 / LT1 trim; VIN / housing configuration verification required |
| 2021 | Camaro SS LT1 6.2L / ZL1 LT4 / LT1 trim; VIN / housing configuration verification required |
| 2022 | Camaro SS LT1 6.2L / ZL1 LT4 / LT1 trim; Cadillac CT5-V Blackwing LT4; VIN / housing configuration verification required |
| 2023 | Camaro SS LT1 6.2L / ZL1 LT4 / LT1 trim; Cadillac CT5-V Blackwing LT4; VIN / housing configuration verification required |
| 2024 | Camaro SS LT1 6.2L / ZL1 LT4 / LT1 trim; Cadillac CT5-V Blackwing LT4; VIN / housing configuration verification required |
| 2025 | Cadillac CT5-V Blackwing LT4; VIN / housing configuration verification required |
| 2026 | Cadillac CT5-V Blackwing LT4; VIN / housing configuration verification required |
Match the housing configuration and VIN. CT5 coverage is CT5-V Blackwing, and CTS-V coverage is the LT4 generation. The Corvette table retains the narrower 2017-2019 Hawks application.
- One water-pump outlet assembly with thermostat
- One manufacturer-listed gasket
The black housing and thermostat form a service assembly at the coolant outlet. Compare the hose connection, mounting flange and thermostat configuration with the original.
GM lists a 194 degrees F / 90 degrees C start-to-open temperature. This is not a promise that coolant temperature will stay fixed at that value.
Allow the cooling system to cool fully before service. Use the GM procedure for draining, housing installation and fastener tightening.
Refill and bleed with the specified coolant. Verify thermostat operation, heater performance and leak-free sealing.
What is the thermostat assembly number?
The confirmed GM thermostat and outlet housing number is 12674634.
Is the thermostat part of the assembly?
Yes. This is the water-pump outlet housing with thermostat.
What is the opening specification?
GM lists a 194 degrees F / 90 degrees C start-to-open temperature.
Does it fit every CT5?
No. The stated CT5 application is the LT4-powered CT5-V Blackwing, subject to VIN confirmation.
What should be compared before installation?
The exact service number, mounting flange, outlet connection and original thermostat configuration.
