Designed to warm the air headed to the cabin and defroster vents, the Agility Auto Parts front Heater Core, part number 9010406, is built for a drop-in fit. It fits many vehicles, among them the 2003-2009 Chevrolet Trailblazer, 2003-2009 GMC Envoy and 2003-2006 Chevrolet Trailblazer EXT. See the "Vehicles it fits" section for the full list.
A heater core works like a small radiator inside the HVAC module. Hot engine coolant flows through its tubes while the blower pushes air across the fins, warming the air on its way to the vents. If a leaking or clogged core is causing weak heat, this 2003-2009 GMC Envoy heater core is a direct-fit replacement for the listed applications.
- Fin and tube design: Agility uses its latest fin and tube technology and enhanced design features for increased thermal performance and resistance to corrosion.
- Drop-In Fit: Fitment is checked in the actual vehicle's HVAC heater module, so the core is ready to install right out of the box.
- Certified heater: Certified to match or surpass OE specifications.
- Quality assured: Engineered and manufactured under ISO TS16949 quality systems, and 100% leak tested.
Signs a heater core may need replacing include weak or no cabin heat, a sweet coolant smell inside the vehicle, a film fogging the windshield, damp front carpet, or unexplained coolant loss. Diagnose the cause before replacing the core, because thermostat, hose or blend-door problems can cause similar symptoms.
Interchange: 18-11705
8406 · 96066 · 52498633 · 98058 · 92019 · 399154 · 93058 · 1811705
This part cross-references / interchanges with the following part numbers:
8406, 96066, 52498633, 98058, 92019, 399154, 18-11705, 93058
Frequently Asked Questions
What does an hvac heater core do?
It works like a small radiator in the HVAC module. Hot engine coolant flows through its tubes, and the blower pushes air across the fins to warm the air sent to the cabin and defroster.
Is this the right 2003-2009 Chevrolet Trailblazer heater core?
It is listed for the 2003-2009 Chevrolet Trailblazer and the 2003-2006 Chevrolet Trailblazer EXT. The "Vehicles it fits" section shows every listed application.
Will it work as a 2004 Trailblazer heater core?
Yes. The 2003-2009 Chevrolet Trailblazer is a listed application, and that range includes 2004 models. The core is also listed for the 2003-2009 GMC Envoy.
How is this heater core made and tested?
Agility builds its heaters under ISO TS16949 quality systems, and every one is 100% leak tested. Fitment is checked in the actual vehicle's HVAC heater module.
What are signs the heater core may need replacing?
Common signs are weak cabin heat, a sweet coolant smell inside, a film fogging the windshield, damp front carpet, or coolant loss. Diagnose first, since other cooling or HVAC faults can cause similar symptoms.
