It’s easy. There is a little black box on the windshield next to the rear view mirror. It snaps onto a metal bracket glued to the windshield. You have to be very careful prying it off so as not to break the tangs. Again, the black cover snaps onto the tangs on one side and is hooked onto the plate on the other side so just pry one end or the other up carefully to see which end the tangs are on. I used a small flat head screw driver. The humidity sensor is also delicate. It just lifts out and has a small plug to unplug. I got my humidity sensor for about $59 at my Dodge dealer but they give me a discount. My service advisor printed out a two page instructions from the TSB or service manual. It probably saved a couple hundred bucks doing it myself and the recirculation and max air was back in business! Good luck!