Originally Posted by Interstate1
I have been an Airstream Interstate owner now for over 4 weeks. I keep noticing that when I'm driving the Mercedes Sprinter I keep hearing a howling/whistle sound when I'm accelerating at low speeds. Is this normal? I'm not sure if it's wind blowing through a loose exterior trim panel or just the diesel turbo working?
That's a rather specific condition, accelerating at low speed
. I believe it is related to the turbo. Otherwise you'd hear it when you're going at a steady speed as well as accelerating.
Don't think it would be a split hose or other damage to the turbo, though. If it was, you'd definitely notice that acceleration would be sluggish; if the turbo was leaking either exhaust or intake air, it would barely have enough power to get out of its own way and you'd default to "limp home" mode.
More likely in my opinion, what you're hearing is the turbo spooling up, which would be a normal sound. I never hear it on mine because I hardly ever drive without tunes playing, either radio, CD, or iPod. That and the fact that I have old ears that don't hear as well in some octaves. Not everyone's hearing is most sensitive in the same octave, so it could just be that you're more sensitive to sound in that particular range than others.
Still, the best advice is, if you hear a sound you aren't sure of, check with your local Sprinter dealer. Offer to take a service technician for a test-drive, and when you hear the noise, point it out to him. If you don't point out the noise yourself and instead just describe it, they may not find the specific noise you're wondering about.