Wehrli WCFab X Fleece Thermostat Housing

2019–2024 Ram 2500 / 3500 6.7L Diesel

Part #: WCF100169-BC

Overview

The Wehrli WCFab X Fleece Thermostat Housing is a premium direct replacement upgrade designed specifically for the 2019–2024 Ram 2500 and 3500 equipped with the 6.7L Cummins diesel engine. This thermostat housing replaces the factory OEM coolant elbow with a more durable, visually appealing component that enhances both the cooling system’s functionality and the engine bay’s aesthetics. Ideal for diesel enthusiasts and performance builders, this housing offers improved coolant routing options and a robust construction that supports demanding applications.

Whether you are upgrading your truck for better cooling efficiency or simply want to complement other performance parts, the WCFab X Fleece Thermostat Housing provides a seamless fit and finish. It is designed to integrate perfectly with other WCFab components such as upper coolant pipes, intake kits, and intercooler piping, making it a versatile choice for comprehensive engine bay upgrades.

Key Features

This thermostat housing combines thoughtful engineering with practical features to meet the needs of diesel performance enthusiasts:

• Direct OEM replacement for the 2019–2024 Ram 6.7L Cummins thermostat housing
• Includes a coolant port with a removable plug for customizable coolant routing
• Durable powder-coated finish available in bronze chrome to match other WCFab upgrades
• Improved coolant flow design to support enhanced engine cooling
• Precision CNC-machined for exact fitment and reliable sealing
• Compatible with factory and aftermarket cooling system components
• Designed to withstand high temperatures and harsh under-hood conditions
• Enhances engine bay appearance with a sleek, performance-oriented look

Construction & Design

The Wehrli WCFab X Fleece Thermostat Housing is crafted from high-quality materials engineered for durability and longevity. The housing is CNC-machined to ensure precise dimensions and a perfect fit on the 6.7L Cummins engine. Its robust construction resists warping and corrosion, common issues with OEM plastic or cast components.

The bronze chrome powder-coated finish not only provides excellent corrosion resistance but also adds a refined, custom appearance that complements other performance parts. The integrated coolant port with plug allows for flexible coolant line configurations, enabling tailored setups for enhanced cooling efficiency or additional sensors.

Installation & Fitment

Installation of the Wehrli WCFab X Fleece Thermostat Housing is straightforward, designed as a direct bolt-on replacement for the factory thermostat housing on 2019–2024 Ram 2500 and 3500 trucks with the 6.7L Cummins diesel engine. No modifications are required, and it fits seamlessly with existing coolant hoses and mounting points.

For best results, it is recommended to replace the thermostat and use new gaskets or seals during installation to ensure a leak-free coolant system. The included coolant port plug can be removed or installed depending on your specific coolant routing needs.

What's Included

• Wehrli WCFab X Fleece Thermostat Housing (bronze chrome powder-coated)
• Coolant port plug
• Installation hardware (if applicable)
• Instructions for installation and coolant routing customization

Ideal For

This thermostat housing upgrade is ideal for Ram 2500 and 3500 owners who want to improve their diesel engine’s cooling system reliability and appearance. It suits performance enthusiasts, diesel truck modifiers, and anyone looking to replace the OEM thermostat housing with a more durable and customizable option. It is also an excellent choice for those upgrading other cooling components like WCFab upper coolant pipes, intake kits, or intercooler piping to create a cohesive, high-performance engine bay setup.

Wehrli Custom Fabrication (WCFab) is a diesel performance and metal fabrication specialist building upgraded hard parts and engineered solutions for Duramax, Cummins, and Power Stroke trucks. Known for high-quality fabrication and truck-focused product development, WCFab supports everything from tow rigs to race-oriented diesel builds where durability, airflow, and heat management matter.