After getting home with my new XRS I heard a strange ticking sound coming from under the hood. I checked and it sounded like a fast sucking/clicking from the top right corner. I buzzed back to the dealer and there tech had no idea what it was. When i got back home the noise was gone. Since then i have heard this noise a few times, but each time i take it to the dealer it isnt clicking. anyone out there have any ideas?