WEHRLI CUSTOM FAB WCF100699 GM BILLET HEATER CORE FITTING KIT W/ HOSE

Product Description

Replace the weak factory plastic heater core fittings on your Duramax truck with the WEHRLI CUSTOM FAB WCF100699 GM BILLET HEATER CORE FITTING KIT WITH HOSE. Designed and manufactured by Wehrli Custom Fabrication, this kit eliminates a common failure point in the GM cooling system by replacing the brittle OEM plastic fittings with durable CNC-machined billet aluminum components.

Factory heater core connections are known to crack or leak over time due to heat cycles and coolant pressure. The Wehrli billet replacement fittings provide a long-lasting upgrade that improves reliability and prevents unexpected coolant leaks. The included high-quality hose ensures proper routing and compatibility with the factory heater core system.

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Key Features

• CNC machined billet aluminum heater core fittings
• Eliminates fragile factory plastic heater fittings
• Includes high-quality heater hose for installation
• Improves cooling system reliability
• Direct replacement design
• Corrosion resistant billet aluminum construction
• Designed and manufactured by Wehrli Custom Fabrication

Fitment

• 2001-2004 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
• 2004.5-2005 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LLY
• 2006-2007 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LBZ
• 2007.5-2010 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LMM
• 2011-2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2001-2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax

Frequently Asked Questions

Why upgrade the factory heater core fittings?

The OEM fittings are made from plastic and commonly crack or break over time. Billet aluminum replacements eliminate this weak point and significantly improve durability.

Is this a direct replacement for factory fittings?

Yes. The Wehrli billet fittings are designed to replace the factory heater core connections while maintaining proper hose routing.

Does the kit include hose?

Yes. The WCF100699 kit includes the necessary heater hose for proper installation.

Is installation difficult?

Installation is straightforward and can typically be completed with basic hand tools. Draining a small amount of coolant may be required.

Will this improve cooling performance?

This kit primarily improves reliability by eliminating the plastic failure point. While it does not increase cooling capacity, it ensures the heater core circuit remains leak-free.

Specifications for WEHRLI CUSTOM FAB WCF100699