I have 03 Malibu, 95 degrees out today, ac on/recirc on for first 15 miles temp OK. Turn ac off, recirc on, no change in temperature inside car for 15 minutes, turn recirc off, humidity & temp rises in minutes. I think the recirute button overrides the ac switch, it was without adoubt running, no change switching ac button on or off, all highway so I couldn't feel it cycling but I know it was. I'll try with the 10 Impala I bet it works the same.
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