I have owned my S60 2.4T for 1 1/2 month and, this morning, I went to the
dealer for a minor problem of bad odour coming from the AC. I asked about
this hissling noise that I also hear and the master tech of the shop told me
that it is normal and explained what does this.
He first asked me if it happens only a couple of times after I start the AC (this is exactly what happens) and described the noise better than I did.
He then gave me a lenghty technical explanation, that I would be unable to repeat, and reassured me that there is nothing wrong.
I must add that if the radio is playing or if I am talking with somebody, I hardly notice it.
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