WEHRLI CUSTOM FAB WCF100157 1998.5-2018 5.9L & 6.7L CUMMINS WCFAB X FLEECE THERMOSTAT HOUSING

Product Description

wehrli custom fab wcf100157, cummins thermostat housing upgrade, fleece thermostat housing cummins, 5.9 cummins coolant elbow upgrade, 6.7 cummins billet thermostat housing, dodge ram cooling system upgrade, cummins -8an coolant port housing, wcfab fleece cooling parts

The WEHRLI CUSTOM FAB WCF100157 WCFAB X FLEECE THERMOSTAT HOUSING is a high-quality cooling system upgrade designed for 1998.5-2018 Dodge Ram Cummins 5.9L and 6.7L engines. Developed through a collaboration between Wehrli Custom Fab and Fleece Performance Engineering, this thermostat housing replaces the restrictive and visually unappealing factory unit with a precision fabricated solution built for durability, performance, and customization.

This upgraded coolant elbow features a -8 AN O-ring auxiliary port with plug, allowing builders to add accessories or customize coolant routing for performance builds, compound turbo systems, or auxiliary cooling modifications. The housing is powder coated in multiple color options to match other WCFab components like upper coolant pipes, intake kits, and valve covers.

Whether you are refreshing your cooling system during an engine rebuild or adding supporting components to a high performance Cummins build, the WCF100157 thermostat housing delivers improved durability, cleaner engine bay appearance, and additional coolant routing flexibility.

Key Features:

• Direct replacement for the factory Cummins thermostat housing
• Integrated -8 AN auxiliary port with plug for coolant routing accessories
• High quality fabricated housing with durable powder coated finish
• Improves engine bay appearance compared to stock cast housing
• Perfect upgrade when installing WCFab coolant pipes or other cooling components
• Designed in partnership with Fleece Performance Engineering
• Made in the USA
• Replacement for OEM thermostat housing part number 68145495AA

Fitment:

• 1998.5–2002 Dodge Ram 2500 5.9L Cummins
• 1998.5–2002 Dodge Ram 3500 5.9L Cummins
• 2003–2007 Dodge Ram 2500 5.9L Cummins
• 2003–2007 Dodge Ram 3500 5.9L Cummins
• 2007.5–2018 Ram 2500 6.7L Cummins
• 2007.5–2018 Ram 3500 6.7L Cummins

Installation Notes:

• Direct replacement for factory thermostat housing
• 2007.5–2012 trucks may require additional installation hardware depending on configuration
• Compatible with factory or upgraded cooling components

FAQ

What does the -8 AN auxiliary port do?

The integrated -8 AN port allows builders to add coolant routing accessories such as temperature sensors, auxiliary cooling loops, turbo coolant feeds, or custom cooling modifications.

Is this thermostat housing a direct bolt-on replacement?

Yes. The WCF100157 is designed as a direct replacement for the factory Cummins thermostat housing and installs using the OEM mounting location and coolant routing.

What engines does this thermostat housing fit?

This housing fits 1998.5-2018 Dodge Ram trucks equipped with the 5.9L or 6.7L Cummins diesel engine.

Do I need tuning after installing this part?

No tuning is required. This component is part of the cooling system and does not affect engine calibration.

Why upgrade the factory thermostat housing?

The OEM housing is known for corrosion and limited flexibility for custom builds. The WCFab x Fleece housing improves durability while adding additional coolant routing options.