Got my 2018 SES new in June 19 and since the weather has turned cold, I'm getting a sound that is like a teapot whistle until it runs for about a mile or two. It disappears by the time I get to the dealer and they look at me oddly when I describe it... Happens above 5mph, is not affected by revs or if it's in gear or brakes. As the car slows to under 5mph, it fades also like a teapot taken off the fire...pitch stays the same. No effect on performance and no trouble light...