Consult your owner's manual: Sometimes, the owner's manual may include part numbers for specific components.
Visit GM Parts website: You can look up parts for your vehicle using GM's official parts website (
https://www.gmpartsgiant.com/). Input your vehicle's information, and you should be able to find the parts you need, along with their part numbers.
Contact a GM dealership: You can call your local GM dealership and provide them with your vehicle's VIN number. They should be able to look up the exact part numbers you need for your heater core, evaporator, and blend door actuators.
Use online parts catalogs: There are several online auto parts catalogs that allow you to search for parts based on your vehicle's information. Websites like RockAuto (
https://www.rockauto.com/) and AutoZone (
https://www.autozone.com/) can help you find the correct parts for your vehicle.
Before attempting the repair yourself, make sure you have access to a repair manual or online resources that can guide you through the process. It's important to follow the correct steps and precautions to avoid damaging your vehicle or its components. Additionally, ensure that you have the necessary tools and workspace to complete the repair.
Keep in mind that working on your vehicle's heating and cooling system can be complex, so if you're unsure about any aspect of the repair, it's best to consult with a professional mechanic.