Wehrli WCFab X Fleece Thermostat Housing

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

Part #: WCF100157-IP

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 more durable and visually appealing solution that enhances both engine cooling efficiency and under-hood aesthetics.

Ideal for diesel enthusiasts and professionals seeking reliable cooling system upgrades, this thermostat housing features a built-in port with a plug, allowing for customizable coolant routing tailored to your specific setup. Finished in a striking Illusion Purple powder coat, it complements other WCFab components such as upper coolant pipes, intake kits, and intercooler piping, making it a perfect match for performance builds and show trucks alike.

Key Features

Engineered for durability and customization, the Wehrli WCFab X Fleece Thermostat Housing offers the following key features:

• Direct OEM replacement for part number 68145495AA, ensuring perfect fitment and compatibility
• Integrated coolant port with plug for flexible coolant routing options
• High-quality powder coat finish in Illusion Purple for corrosion resistance and enhanced appearance
• Designed to complement WCFab’s full line of cooling and intake upgrades
• Precision CNC-machined for consistent sealing and leak-free operation
• Compatible with both 5.9L and 6.7L Cummins diesel engines across multiple model years
• Improves coolant flow efficiency compared to the OEM plastic housing
• Robust construction to withstand high-temperature diesel engine environments

Construction & Design

The thermostat housing is crafted from premium-grade aluminum, providing superior strength and heat dissipation compared to the original plastic OEM component. Its CNC-machined design ensures precise tolerances for a secure fit and reliable sealing against coolant leaks. The powder-coated Illusion Purple finish not only adds a vibrant custom look but also protects the housing from corrosion and wear caused by harsh engine bay conditions.

Attention to detail in the engineering process guarantees that this housing integrates seamlessly with factory cooling system components while offering enhanced durability and customization potential for performance applications.

Installation & Fitment

Installation is straightforward, as this thermostat housing is a direct bolt-on replacement for the OEM part number 68145495AA. No modifications to the vehicle’s cooling system are required, making it an ideal upgrade for both professional mechanics and DIY enthusiasts. The included coolant port plug allows users to tailor coolant routing without additional fabrication.

This housing fits the following vehicles:

• 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

What's Included

• Wehrli WCFab X Fleece Thermostat Housing in Illusion Purple powder coat
• Coolant port plug for customization
• Installation hardware (as required)

Ideal For

This thermostat housing is perfect for Dodge Ram owners looking to upgrade their cooling system with a durable, customizable, and visually striking component. It suits diesel performance enthusiasts, off-roaders, and anyone performing engine bay upgrades who demands reliability and style. It also pairs seamlessly with other WCFab cooling and intake products to create 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.