Product Description
The WEHRLI CUSTOM FAB WCF100169 WCFAB X FLEECE THERMOSTAT HOUSING FOR 2019-2023 6.7L CUMMINS is a premium cooling system upgrade engineered to replace the factory plastic thermostat housing found on late-model Ram Cummins trucks. Designed through a collaboration between Wehrli Custom Fabrication and Fleece Performance Engineering, this billet aluminum housing dramatically improves durability while providing a clean and professional engine bay appearance.
The factory plastic housing can become brittle over time due to heat cycles and coolant exposure. The WCFab x Fleece billet housing eliminates this weak point with CNC-machined aluminum construction that is far more resistant to cracking, warping, or coolant leaks. This upgrade is ideal for trucks that tow, work hard, or operate under higher power levels where cooling system reliability is critical.
Designed as a direct bolt-on replacement, the housing installs using factory mounting points and connections, allowing a straightforward upgrade without major modifications. Whether you're maintaining a work truck or building a high-performance Cummins setup, the WCF100169 provides long-term cooling system reliability.
Key Features
- CNC-machined billet aluminum thermostat housing
- Developed in collaboration with Fleece Performance Engineering
- Direct replacement for the factory plastic thermostat housing
- Improves long-term cooling system durability
- Designed for heavy-duty towing, performance builds, and daily drivers
- Precision sealing surfaces to help prevent coolant leaks
- Direct bolt-on installation using factory connections
- Made in the USA
Fitment
- 2019 Ram 2500 6.7L Cummins
- 2020 Ram 2500 6.7L Cummins
- 2021 Ram 2500 6.7L Cummins
- 2022 Ram 2500 6.7L Cummins
- 2023 Ram 2500 6.7L Cummins
- 2019 Ram 3500 6.7L Cummins
- 2020 Ram 3500 6.7L Cummins
- 2021 Ram 3500 6.7L Cummins
- 2022 Ram 3500 6.7L Cummins
- 2023 Ram 3500 6.7L Cummins
FAQ
Why replace the factory thermostat housing?
The factory housing on many modern Cummins trucks is made from plastic. Over time heat cycles can cause cracking or warping. The billet aluminum WCFab housing provides a stronger long-term solution.
Is this a direct replacement for the OEM thermostat housing?
Yes. The WCF100169 is engineered as a direct replacement for the factory housing and installs using the factory mounting points and hose connections.
Do I need tuning or other modifications to install this part?
No tuning is required. This is a mechanical cooling system upgrade designed to bolt directly onto stock or modified trucks.
Is this upgrade recommended for towing trucks?
Yes. Trucks that tow frequently or operate under higher load benefit from the improved durability and reliability of a billet aluminum thermostat housing.
Who manufactures this thermostat housing?
This product is manufactured by Wehrli Custom Fabrication and developed in collaboration with Fleece Performance Engineering, two well-known brands in the diesel performance industry.
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100169 |
| Product Type | Billet Thermostat Housing |
| Material | CNC Machined Billet Aluminum |
| UPC | Not publicly listed |
| GTIN | Not publicly listed |
| Shipping Info | Estimated shipping weight 2-3 lbs. Ships via UPS or FedEx. |
| Country of Origin | United States |
| Prop 65 | This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. See www.P65Warnings.ca.gov |
