SL55/63/65/R230 AMG: 2005 SL65 Hissing from AC vent?
Seems to come and go, but it even persists after the engine is off. I'm assuming it's a vacuum leak.
Anyone have an idea as to how much this would possibly cost (ballpark) and whether or not it's something I should take to the dealer to fix?
Still blowing cold. It seems to be passenger side only.



