2004 Yukon Denali w/dual automatic climate control

[98Z]

So I've stopped getting good heat out of my dash. Now that it's winter in Iowa, I'd really like to have heat.

I had a local shop check things over (friend's place) and they originally thought maybe it just needed a good coolant system bleeding. They thought about pressurizing the system to push air out, but there is evidence of leak stop being in the system, so we've decided against the pressurizing for the time being.

They've suggested replacing the heater core and evaporator in the air box.

A scan of the system says that the blend door actuator has an issue and that needs to be replaced. What they wanted to do was replace all the actuators with new and get everything all done at one time.

Completely disassemble the dash and pull the heater box. Replace the core and evaporator and all actuators. Roughly a $1200 all day job.

That's a large chunk of change that I really don't have. So, I kind of want to attempt this myself. I'm not afraid of tearing things apart. I just want to make sure I purchase the right items. Does anyone have any info on part numbers for all these parts?

[igor@af]

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.