Wehrli WCFab X Fleece Thermostat Housing

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

Part #: WCF100157-SGB

Overview

The Wehrli WCFab X Fleece Thermostat Housing is a premium direct replacement designed specifically for Dodge and Ram 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 diesel enthusiasts looking to enhance engine bay aesthetics and improve coolant routing flexibility, this housing is engineered to complement other WCFab and Fleece Performance Engineering upgrades.

Whether you’re restoring your truck or upgrading for better performance and reliability, this thermostat housing provides a robust and visually appealing alternative to the stock part. Its semi-gloss black powder coat finish ensures corrosion resistance while matching seamlessly with other aftermarket components.

Key Features

Designed with precision and functionality 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 plug, allowing for customizable coolant routing options
• Durable semi-gloss black powder coat finish for corrosion resistance and enhanced engine bay appearance
• Compatible with WCFab Upper Coolant Pipes, Intake Kits, and Intercooler Piping for a coordinated upgrade
• Precision-machined from high-quality materials for long-lasting durability
• Designed specifically for 5.9L and 6.7L Cummins diesel engines in Dodge Ram 2500 and 3500 models
• Improves coolant flow efficiency by replacing the restrictive OEM housing design
• Easy to install with no modifications required

Construction & Design

The thermostat housing is crafted from robust, high-grade aluminum, providing excellent heat dissipation and resistance to corrosion common in diesel engine cooling systems. Its semi-gloss black powder coat finish not only protects the housing from rust and wear but also adds a sleek, professional look under the hood. The integrated coolant port with plug offers versatility for custom coolant line setups, making it a smart choice for enthusiasts who want to optimize their cooling system layout.

Every unit undergoes precise CNC machining to ensure tight tolerances and a perfect seal with the engine block, preventing leaks and maintaining optimal coolant pressure. This attention to detail guarantees a reliable upgrade that stands up to the demands of heavy-duty diesel applications.

Installation & Fitment

The Wehrli WCFab X Fleece Thermostat Housing is designed as a direct bolt-on replacement for the OEM thermostat housing on Dodge and Ram 2500 and 3500 trucks with 5.9L and 6.7L Cummins engines from 1998 to 2018. Installation requires no special tools or modifications, making it accessible for DIY mechanics and professional installers alike. Simply remove the factory housing and replace it with this upgraded unit, ensuring all gaskets and seals are properly installed to prevent leaks.

Its precise fitment ensures compatibility across multiple model years and engine sizes, providing a hassle-free upgrade that enhances both form and function.

What's Included

• One Wehrli WCFab X Fleece Thermostat Housing in semi-gloss black
• Coolant port plug installed
• Installation hardware (if applicable)
• Detailed installation instructions

Ideal For

This thermostat housing is perfect for Dodge and Ram diesel truck owners who want to replace their aging or damaged OEM coolant elbow with a high-quality, durable, and visually appealing upgrade. It is especially suited for enthusiasts building performance cooling systems or those integrating WCFab and Fleece Performance Engineering components for a cohesive engine bay setup. Whether you’re restoring a classic Cummins-powered truck or enhancing a modern diesel rig, this thermostat housing delivers reliability and style.

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.