Interesting post... After installing the ACS, we noticed a wierd sound coming from the dash-back engine area. Would notice at slow speeds,hitting bumps or uneven road.. Took it back to shop and had them retighten and check everything.. Noise still there, looked at every option for the noise and never found anything??? Does the noise you all are hearing sound similar to this?? I have actually just tried to ignore it since, but this noise issue makes me curious...
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