Wehrli WCFab X Fleece Thermostat Housing

1998–2018 Dodge Ram 2500/3500 5.9L & 6.7L Diesel

Part #: WCF100157-GB

Overview

The Wehrli WCFab X Fleece Performance Engineering Thermostat Housing is a premium direct replacement designed specifically for Dodge Ram 2500 and 3500 trucks equipped with 5.9L and 6.7L Cummins diesel engines from 1998 through 2018. This thermostat housing upgrade replaces the factory OEM coolant elbow, offering a cleaner, more durable, and customizable solution for your cooling system. Ideal for enthusiasts looking to enhance engine bay aesthetics while improving coolant routing flexibility, this part is engineered to complement other WCFab cooling and intake upgrades.

Whether you are restoring your truck or upgrading for better performance and reliability, this thermostat housing provides a robust alternative to the stock component, ensuring optimal coolant flow and temperature regulation under demanding conditions.

Key Features

The Wehrli WCFab X Fleece Thermostat Housing combines functional design with high-quality finishes to meet the needs of diesel performance enthusiasts. Key features include:

• Direct OEM replacement for Chrysler part number 68145495AA
• Compatible with 1998–2007 5.9L and 2008–2018 6.7L Cummins engines in Dodge Ram 2500 and 3500 models
• Integrated coolant port with plug for customizable coolant routing options
• Durable powder-coated finish available in gloss black to resist corrosion and complement engine bay upgrades
• Designed to work seamlessly with WCFab Upper Coolant Pipes, Intake Kits, and Intercooler Piping
• Precision-engineered for a perfect fit and reliable sealing to prevent leaks
• Improves engine bay appearance by replacing the OEM’s less attractive plastic housing

Construction & Design

Manufactured with high-grade materials and finished with a tough powder coat, the Wehrli WCFab thermostat housing offers superior durability compared to the original plastic OEM part. The robust construction withstands high temperatures and pressure fluctuations common in diesel cooling systems. The gloss black powder coating not only enhances corrosion resistance but also provides a sleek, professional look that pairs well with other performance components.

The housing’s design incorporates a strategically placed coolant port with a removable plug, allowing users to tailor coolant flow paths to their specific setup. This flexibility is particularly beneficial for custom cooling system configurations or when integrating aftermarket cooling accessories.

Installation & Fitment

Installation is straightforward as this thermostat housing is a direct bolt-on replacement for the OEM coolant elbow. It fits perfectly on Dodge Ram 2500 and 3500 trucks equipped with 5.9L engines from 1998 to 2007 and 6.7L engines from 2008 to 2018. No modifications are necessary, making it an ideal upgrade for both professional mechanics and DIY enthusiasts. The included port plug allows for easy customization without additional machining or adapters.

What's Included

• Wehrli WCFab X Fleece Thermostat Housing (Gloss Black)
• Coolant port plug for customization
• Installation hardware (as required)

Ideal For

This thermostat housing is perfect for Dodge Ram 2500 and 3500 owners seeking a reliable, visually appealing upgrade to their cooling system. It suits diesel performance enthusiasts, truck restorers, and anyone looking to improve coolant routing flexibility while enhancing engine bay aesthetics. It also pairs well with other WCFab cooling and intake components for a cohesive, high-performance 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.