Could it be anything besides the heater core?

I took several pictures when I changed my heater core and evap core a few years ago. I had to do mine over several days due to my work schedule so I was worried I’d forget where some connectors went and some hardware. I put painters tape on each side of a connector and started labeling all of them with letters that way I knew where everything connected. I also put screws in ziplock bags and labeled them accordingly. I wasn’t really hard to do, just time consuming.

Hope this helps a little.

https://wranglertjforum.com/threads/another-heater-core-replacement-and-a-c-evap-core.15568/
 
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