In my trailer, if I have the fan on Auto (AU) it turns off when the A/C cycles off. If I put the fan on low or high it will continue to run accordingly.
If your t-stat is the same, maybe it's set to auto.
Mike
Im Mike Willoughby, and I approve this message.
2017 Ram 3500 CTD (aka FRAM)
2019 GrandDesign Reflection 367BHS