Dave, assuming you are talking about the dometic ccc2 thermostat, there is a point on the middle bottom that must be pushed in to release and then you can rotate the bottom out and push upwards to release the top clip area. The only connection to the thermostat is a four pin telephone cable. Are you sure the fan speed hasn't been changed from auto? John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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