2007 impala, when I turn the ac off....a loud clicking/rapping noise comes from the fan area, stops after a few minutes.
I would inspect the AC belt and any idler wheels on it. Maybe when the AC compressor unloads it causes the belt tension to change and somehow make that noise.
Make sure the fan is not hitting the cowling. All bolts/screws in place and shroud not loose. That's what it sounds like to me
blend door motor under dash is on its way out, get a new one, easy to change youtube
common problem on impalas
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