Wehrli WCFab X Fleece Thermostat Housing

2019–2024 Ram 2500 / 3500 6.7L Diesel

Part #: WCF100169-FB

Overview

The Wehrli WCFab X Fleece Thermostat Housing is a premium direct replacement for the factory thermostat housing on 2019 to 2024 Ram 2500 and 3500 trucks equipped with the 6.7L Cummins diesel engine. Designed to upgrade the OEM coolant elbow, this housing not only improves the engine bay’s appearance with a sleek flat black powder-coated finish but also enhances functionality with a customizable coolant routing port. It is an ideal upgrade for diesel enthusiasts seeking both style and performance improvements in their cooling system.

Built to complement other WCFab cooling and intake components, this thermostat housing integrates seamlessly with WCFab upper coolant pipes, intake kits, and intercooler piping, allowing for a cohesive and high-quality engine bay setup. Whether you are upgrading for better cooling efficiency or aesthetic appeal, this housing offers a reliable and durable solution.

Key Features

This thermostat housing combines thoughtful engineering with practical features designed for diesel performance applications:

• Direct OEM replacement for the 2019–2024 Ram 2500/3500 6.7L Cummins thermostat housing
• Includes a coolant port with a plug for customizable coolant routing options
• Durable powder-coated finish in flat black for corrosion resistance and enhanced appearance
• Precision-machined for a perfect fit and reliable sealing
• Compatible with WCFab upper coolant pipes, intake kits, and intercooler piping for system upgrades
• Improves engine bay aesthetics by replacing the stock, less attractive OEM part
• Designed to withstand the rigors of diesel engine cooling systems

Construction & Design

The Wehrli WCFab X Fleece Thermostat Housing is crafted from high-quality materials engineered to endure the demanding environment of a diesel engine’s cooling system. The housing is precision-machined to ensure exact fitment and optimal sealing against leaks. Its robust construction resists warping and corrosion, providing long-lasting durability.

The flat black powder-coated finish not only protects the housing from rust and wear but also offers a clean, professional look that complements other performance upgrades under the hood. The integrated coolant port with plug allows for flexible coolant line configurations, enabling custom setups tailored to your specific cooling needs.

Installation & Fitment

Installation is straightforward as this thermostat housing is designed as a direct bolt-on replacement for the factory unit on 2019–2024 Ram 2500 and 3500 trucks with the 6.7L Cummins diesel engine. No modifications are required, making it suitable for both professional installers and experienced DIY enthusiasts. The included coolant port plug can be removed or left in place depending on your coolant routing preferences.

What's Included

• Wehrli WCFab X Fleece Thermostat Housing (flat black powder-coated)
• Coolant port plug for customization
• Installation hardware (if applicable)

Ideal For

This thermostat housing is perfect for Ram 2500 and 3500 owners who want to upgrade their cooling system components with high-quality, durable parts that improve both performance and appearance. It is especially suited for diesel enthusiasts who run upgraded intake and intercooler setups and desire a cohesive, professional engine bay look. Whether you are building a daily driver, work truck, or performance rig, this housing offers a reliable and stylish solution.

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.