Wehrli WCFab X Fleece Thermostat Housing

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

Part #: WCF100157-GRY

Overview

The Wehrli WCFab X Fleece Performance Engineering Thermostat Housing is a premium direct replacement upgrade 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 replaces the factory OEM coolant elbow, offering a cleaner, more durable, and highly functional solution for your cooling system. Ideal for diesel enthusiasts and professionals seeking enhanced reliability and customization, this housing improves coolant routing options while complementing other performance upgrades.

Finished in a durable grey powder coat, this thermostat housing not only resists corrosion but also matches perfectly with other WCFab components such as upper coolant pipes, intake kits, and intercooler piping. It’s engineered to fit seamlessly, making it a smart upgrade for those looking to maintain or improve their truck’s cooling efficiency and overall engine bay aesthetics.

Key Features

Designed with precision and performance in mind, the Wehrli WCFab X Fleece Thermostat Housing offers several key benefits:

• Direct OEM replacement for part number 68145495AA, ensuring perfect fitment and compatibility
• Includes a coolant port with a removable plug, allowing for customizable coolant routing and accessory integration
• Durable powder-coated finish in grey for corrosion resistance and a clean, professional appearance
• Compatible with both 5.9L and 6.7L Cummins diesel engines across multiple Dodge Ram 2500 and 3500 model years
• Engineered to work seamlessly with WCFab’s line of upper coolant pipes, intake kits, and intercooler piping for a cohesive upgrade
• Robust construction designed to withstand high temperatures and harsh diesel operating conditions
• Improves coolant flow efficiency compared to the OEM housing

Construction & Design

The thermostat housing is crafted from high-quality materials engineered to endure the demanding environment of diesel engine cooling systems. Its sturdy construction ensures long-lasting durability and resistance to cracking or warping under extreme heat cycles. The powder-coated grey finish not only enhances corrosion resistance but also provides a sleek, uniform look that complements other engine bay components.

The integrated coolant port with plug offers flexibility for custom coolant line setups, making it ideal for trucks with additional cooling needs or aftermarket accessories. Precision machining guarantees a tight seal and reliable performance, reducing the risk of leaks and coolant loss.

Installation & Fitment

Installation is straightforward as this thermostat housing is designed as a direct bolt-on replacement for the OEM part number 68145495AA. It fits the following vehicles without modification:

• 1998–2007 Dodge Ram 2500 5.9L Diesel
• 1998–2007 Dodge Ram 3500 5.9L Diesel
• 2008–2010 Dodge Ram 2500 6.7L Diesel
• 2008–2009 Dodge Ram 3500 6.7L Diesel
• 2011–2018 Ram 2500 6.7L Diesel
• 2011–2018 Ram 3500 6.7L Diesel

No special tools or modifications are required, making it an ideal upgrade for both professional mechanics and experienced DIY enthusiasts. The included coolant port plug can be removed or installed depending on your cooling system configuration.

What's Included

• Wehrli WCFab X Fleece Thermostat Housing (powder coated grey)
• Coolant port plug for customization
• Installation hardware (where applicable)

Ideal For

This thermostat housing is perfect for Dodge Ram owners looking to replace the factory coolant elbow with a more durable, customizable, and visually appealing component. It suits diesel truck enthusiasts upgrading their cooling system for improved reliability, those performing engine rebuilds, or anyone seeking to complement other WCFab performance parts for a cohesive engine bay setup. Whether for daily driving, towing, or off-road use, this housing enhances cooling system performance and longevity.

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.