A lack of sufficient air flow thru the coils will ice it up when the temp setting doesn't allow the unit to cycle off. Crank up the fan setting and completely open the louvers and see if it doesn't get down to your temp setting.
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Frank and Marilyn
2014 3402RL, Sailun S637/Disc Brakes
2015 F350 CC LWB SRW 6.7L PSD FX4
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