Check to make sure your vent is actually hooked up. The heating and cooling for the back is under the front seats. So if it is operable it should be blowing on their feet. It has been reported more than a few times that the vent molding was not connected and therefore not really receiving any air flow. There are lots of extension pieces for these type of under seat vents that could likely be fitted to work for the bronco. I do not know of any actually made for the bronco.
95 Eddie 5.8 Windsor 2021? nope, 2022?, wait 2022.5 HOSS3.0 equipped WildTrak/LUX/Leather/MIC. 7/14 RES