One Stop Solutions 99031 HVAC Heater Core - Front

HVAC Heater Core for 2002 GM SUVs

This HVAC heater core from One Stop Solutions is a direct-fit replacement for select 2002 Chevrolet, GMC, and Oldsmobile applications. Part number 99031 is listed for front-position fitment and is cross-referenced to Dorman - HELP 99375 for the same application.

• HVAC heater core for front installation
• Fits 2002 Chevrolet Trailblazer, front
• Fits 2002 Chevrolet Trailblazer EXT, front
• Fits 2002 GMC Envoy, front
• Fits 2002 GMC Envoy XL, front
• Fits 2002 Oldsmobile Bravada, front

Application Details

Use this heater core when servicing the cabin heating system on 2002 Chevrolet Trailblazer, Chevrolet Trailblazer EXT, GMC Envoy, GMC Envoy XL, and Oldsmobile Bravada models with front HVAC placement. Part number 99031 is cataloged for these vehicle-specific applications and supports replacement of a leaking or restricted heater core in the heating and defrost system.

Common Reasons for Replacement

• Loss of cabin heat
• Coolant odor inside the vehicle
• Sweet smell or visible coolant seepage under the dash
• Fogging or poor defrost performance
• Restricted coolant flow through the heater circuit

Installation Notes and Tips

Verify the vehicle’s HVAC layout and front-position configuration before installation. Drain and refill coolant as required, and inspect hoses, clamps, and seals during service to help prevent repeat leaks. Confirm the replacement matches the original heater core dimensions and connection style before reassembly.

Quality Assurance

One Stop Solutions part 99031 is cataloged as an OE-style HVAC heater core replacement for the listed applications. This part cross-references Dorman - HELP 99375 for the same application.