This is more than likely a blend door issue as you have separate systems in the van.
Here are a couple guides that will help with figuring this out:
https://youtu.be/SNRb6pSwYuU
https://youtu.be/Eqf-H3COtSo
Below you will find the process from the manual that will help with replacing this.
Please run through this info and let us know if you have other questions.
Thanks
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Sunday, August 1st, 2021 AT 6:50 PM