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Old 11-25-2019, 09:42 AM   #1
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2014 Interstate Coach
Arroyo Grande & Central Point , California & Oregon
Join Date: Sep 2011
Posts: 624
Whistling noise from engine

On a recent 700mile trip towing a very light (2600#) towd, we experienced a whistling noise that appeared to come from the front of vehicle. It rose and fell with engine rpm. This morning on the way to the Mercedes dealer to have it checked out, the noise wasn't there. Even after warm up on the highway. Anyone else have such an experience?

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Old 11-25-2019, 10:15 AM   #2
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2018 Tommy Bahama Interstate
Orlando , Florida
Join Date: Sep 2017
Posts: 2,567
Turbo hose leak? Turbo wastegate leak...

Without having heard it, I would start by checking the condition of all the turbo hoses...
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2018 Airstream Interstate 3500 Lounge EXT Tommy Bahama w/ARS
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Old 11-25-2019, 11:24 AM   #3
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2018 Atlas
Milford , Ontario
Join Date: Aug 2018
Posts: 8
I had a whistle which I thought was from the engine. Came on louder at about 50mph.
Diagnosis at Mercedes determined that it was actually from the back axle. Axle was replaced (warranty) and now no whistle.
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