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  1. Cold Air Blowing When Heat is On & Humming Noise When Car Shut Off

    Hello! I have a 2014 Armada. Yesterday when I turned on the heat, only cold air came out. I checked the coolant level and it is fine. There was also a strange humming sound that lasted about 10 seconds after turning the car off. Any thoughts on what the noise could be? Are the 2 related?