Global Parts 8231671 HVAC Heater Core - Rear

Rear HVAC Heater Core for Trailblazer and Envoy

Global Parts 8231671 is a specific-fit rear HVAC heater core built for vehicles that use a rear heat exchanger in the climate control system. It transfers heat from engine coolant into the cabin air stream, helping restore rear passenger heat in the Chevrolet Trailblazer, GMC Envoy, Buick Rainier, and related applications.

Key Features

• Specific-fit HVAC heater core for confirmed rear applications
• Aluminum construction for efficient heat transfer
• Direct replacement format for service on rear climate systems
• Fits 2002-2009 Chevrolet Trailblazer, rear
• Fits 2002-2009 GMC Envoy, rear
• Fits 2004-2007 Buick Rainier, rear
• Part number 8231671 for catalog and service matching

Product Details

This heater core is designed for rear HVAC service where coolant flow through the core provides cabin heat. The aluminum construction supports thermal transfer in the heating circuit, while the specific-fit design helps match the original rear heater core layout on supported vehicles. Global Parts 8231671 is listed for 2002-2009 Chevrolet Trailblazer rear, 2002-2009 GMC Envoy rear, 2004-2007 Buick Rainier rear, 2002-2006 Chevrolet Trailblazer EXT rear, 2002-2006 GMC Envoy XL rear, and 2004-2005 GMC Envoy XUV rear. This part cross-references UAC HT2002C for the same application.

Common Repair Uses

• Restores rear cabin heat when the original core is restricted or leaking
• Addresses coolant odor or dampness from a failed heater core
• Helps correct weak or uneven rear heat output
• Supports repair of a clogged or corroded rear HVAC heat exchanger
• Replaces a worn unit in Trailblazer, Envoy, and Rainier rear HVAC systems

Installation Notes

Verify rear HVAC fitment by year, make, model, and position before installation. Drain and recover coolant according to service procedures, then inspect hoses, seals, and related HVAC components for wear or contamination. Because this is a specific-fit aluminum heater core, confirm pipe orientation and system routing against the vehicle’s original part before reassembly. Part number 8231671 should be matched to the vehicle application listed above.

Quality Assurance

Global Parts supplies this heater core as a specific-fit replacement for the listed rear applications. The aluminum core construction and application-specific design support service replacement for vehicles requiring rear cabin heat restoration.