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Old 01-30-2023, 09:38 PM   #1
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Name that noise

We have a 2022 Entegra Accolade 37k on the S2RV chassis. When at highway speeds I hear a faint ďwhirringĒ motor type noise for about 20 seconds every 5 minutes or so.

* Itís quiet but audible to me. Unfortunately my wife says she canít hear it.

* Iíve never heard it at lower speeds or when stopped.

* Iím pretty sure itís not the air system as that makes more of a clacka-clacka noise and I canít hear that any longer once we get rolling

* This is about the pitch of the whirring of the blade on a big cabinet-style table saw

* it sounds to me like itís coming from right behind and to my right, but can say positively as Iím driving so canít exactly get up and move around to better identify the location.

Iím fairly sure itís a normal noise as it has happened since we got the rig, just would like to know what it is as Iíve identified every other sound (e.g., turbo, fan, air compressor) that occurs when underway.

Any ideas?
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Old 01-31-2023, 11:25 PM   #2
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It's not the cooling fan from the radiator kicking on at about 200į?

Mine is not very faint, but the frequency can be similar
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Old 02-01-2023, 04:16 PM   #3
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Good question, but definitely not the cooling fan. When that turns on, thereís no mistaking the jet engine trying to escape the hood.

Much like to cooling fan, however, this noise does indeed seem to be either event driven (when X happens it turns on) or time driven (every Y minutes).
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Old 02-01-2023, 04:59 PM   #4
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Does it happen when you are stationary? Ask because we have some noise with the cabinetry near the sink rubbing against something that creates a similar noise while driving. We also have a load crackling noise that was the cab separating but that came mostly from the left of the driver. We started to hear some noise from the top of the bunk as well.
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Old 02-01-2023, 05:10 PM   #5
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Sounds like a there may be an electric cooling fan. Once the engine hits a certain temperature, the fan will engage. Once cooling is achieved, it will stop until the temp rises again.


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Old 02-01-2023, 05:22 PM   #6
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Is it possibly the turbo? I notice mine at high speeds but it is fairly consistent when I am driving doesnít cycle on and off as you describe. But it comes on when I put the pedal down and I am already driving 60+.
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Old 02-01-2023, 09:03 PM   #7
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All good questions.

Definitely not the turbo. Much like the cooling fan, that has a very unique sound which was one of the first things I noticed.

Iíve never noticed it when at slow speed or stopped, only fairly consistent highway speeds (55 or higher). Not saying it doesnít occur, just never heard it.

It does sound fan, turbine or motor-like. As I said above, the tone/pitch/speed reminds me of the sound of the whir of the blade in a cabinet table saw.

I suspect itís something unique to the Freightliner S2 or diesel coaches in general.
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