Brand new 2018 Enclave Essence, a strange sound is either coming from the air system (makes the noise with air off or on) or the motor. It doesn’t do it all the time but a lot and it’s pretty loud. Its a fluttering, tapping light knocking noise. No matter speed, air on or off, it still does it, it seems is coming from the center of the inside. It stops on it’s own but comes back. Has anyone else noticed anything similar. This car only as 400 miles on it.
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