We came down from a mountain - about 40 miles downhill, hot outside and at the bottom my car started to make a whining noise. Could it be the air conditioner?
could be anyone of the above issues. i had a nasty whine in mine, turned out to be the power steering fluid. give that a check too. and cross your fingers that its a cheap fix!
I am sorry to hear that you are experiencing a sound emanating from the bottom of your STS. I do see you are reaching out to the community to see if they have any idea what the sound could be. If you were interested in taking your vehicle to the dealership in regards to this sound, I would be more than happy to assist you in working with them. Please private message me or send me an email at socialmedia@gm.com if you would like any assistance. Thank you very much for your time.
Gregory W.
Cadillac Customer Care
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