Browse GMC Envoy Plate Heat Exchanger Parts & GMC Envoy Parts Of Heat Exchanger Get GMC Envoy Heater Core Replacement Parts. Ensuring the longevity of your GMC Envoy's heater core starts with routine maintenance checks and prompt attention to signs of wear, such as a sweet smell inside the vehicle or defroster inefficiency, indicating it's time for a replacement. Choose a high-quality aluminum or brass heater core, keeping in mind that aluminum offers superior heat conduction and is lightweight, while brass cores boast durability. Installation ease can be enhanced with cores that match OEM specifications. To extend its lifespan, keep your coolant system clean and free of contaminants, and ensure the core is properly sealed during installation, securing peak performance and cabin comfort. Shop with confidence online, selecting from a range of premium heater cores designed for your Envoy, backed by robust warranties and customer support.