Help bring warmth back to the cabin with the Agility Auto Parts Heater Core 9010463, the heat exchanger that transfers engine-coolant heat into the air your blower sends through the vents. It fits many vehicles, among them the 2003-2006 Chevrolet Silverado 1500, 2003-2007 Chevrolet Silverado 2500 and 2003-2006 GMC Sierra 1500. See the Buyer's Guide tab for the full list and engine details.
Hot coolant circulates through the HVAC heater core, and air pushed across its fins picks up that heat before it reaches the cabin. Signs a heater core may need replacing include weak or no heat from the vents, a sweet coolant smell inside the vehicle, a windshield that fogs easily or a damp passenger floor. Low coolant, a stuck thermostat or a blend-door fault can cause similar signs, so diagnose the cause before replacing the core.
Interchange: 18-12342
1812342 · 8554 · 9949 · 88986627 · 99079 · 92023 · 99374
This part cross-references / interchanges with the following part numbers:
Is this the right heater core for my 2003-2006 Chevy Silverado 1500?
It is listed for the 2003-2006 Chevrolet Silverado 1500, along with the 2003-2007 Chevrolet Silverado 2500 and 2003-2006 GMC Sierra 1500. Check the Buyer's Guide tab to confirm your exact vehicle.
What does a heater core do?
It works as a small heat exchanger. Hot engine coolant flows through its tubes and fins, and the blower pushes air across it to send warm air into the cabin.
What signs suggest the heater core may need replacing?
Weak or no cabin heat, a sweet coolant smell inside, a fogging windshield or a damp floor can be signs. Low coolant or a stuck thermostat can cause similar symptoms, so diagnose the cause first.
How is this heater core quality tested?
Agility builds its heaters under ISO TS16949 quality systems and leak tests every one. Each is also fitment checked in the actual vehicle's HVAC heater module.
Is it ready to install out of the box?
Yes. Agility fitment checks its heaters in the vehicle's heater module for a drop-in fit. Follow the vehicle service information for draining, refilling and bleeding the cooling system.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
