We have a 2016 ACE 28.1 and the light behind the temperature control was simply that the bulb was not properly placed. If you loosen the 2 screws holding the plate that holds the control you can easily access the bulb and its wiring. As far as the AC - ours blows cold air but not cold enough to cool the coach on a hot day. I haven't had any luck talking with our dealer's service department as they want to push it off as a Ford chassis issue. I'm going to try adding freon.
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