Heater core removal

I am attaching the process from the manual on how to remove and install the heater core from the HVAC housing.

Also, here is a guide that will help with figuring out how to do this. Clearly this is not on your vehicle but it does give a little more general information that can help.

https://www.2carpros.com/articles/replace-heater-core

Let us know if you need more help. If you do get some pictures of what you are dealing with and we can go from there. Thanks