When you press the mode button and stop it at fan the + and – should offer you Low, High, or Auto. Once you select Low you should push the mode button again to go to Cool and then the + and – should change the temperature setting.
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Bob and Joyce
2013 CC Silverback 29RL
2010 Ford F250 XL Crew Cab 6.4 liter diesel
ATU Local 788
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