DK1
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I have a 2018 JL with auto climate control. Running a/c in auto mode, every few minutes heat will come from under the dash. A/C continues to blow cold from dash vents, but heated air comes from under the dash. Service Mgr at my dealer says this is normal, as it is trying to maintain set temp. I also have a 2019 Ram 1200 with ATC that doesn't do that. ATC should use a blend door to mix warm and cold air to maintain cabin set temp, not give you a blast of hot air. Is this a fact of life with a JL?
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