This is my first forum post - sorry in advance if I don't provide all necessary information, but I'll do my best.

I have a 2012 XC70. Base model, AWD, not T5.

Often, after I shut the car down, the engine will whine for a few minutes. It almost sounds like a very faint whine from the horn, but I cannot be sure of the source.

This has been going on for many months, and does not seem to be negatively impacting anything else. I even brought the car into the dealer to have a belt replaced, and they either ignored the issue or could not find the cause.

Any ideas what may be causing this?