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Old 03-26-2021, 01:57 PM   #1
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Join Date: Jun 2020
Location: Long Beach, CA
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Year: 1998
Coachwork: Blue Bird
Chassis: TC1000, 40' MPV
Engine: 5.9 Cummins/B300 trans
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Dash top fan

My BB has a 2 speed fan on the dash that sounds like a turbine when it's running. I took it all apart, cleaned and oiled it and if anything it's louder than before. Is is the metal fan blade or...?

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Old 03-26-2021, 02:58 PM   #2
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Join Date: Nov 2010
Location: Andrews,Indiana
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Year: 1991
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Chassis: AARE
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Mine do (91 AARE) They aren't really loud though. The two of them both on kind of get a harmonic going though. I think it's the pitch of the fan blade.
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Old 03-26-2021, 03:51 PM   #3
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Join Date: Jun 2020
Location: Long Beach, CA
Posts: 527
Year: 1998
Coachwork: Blue Bird
Chassis: TC1000, 40' MPV
Engine: 5.9 Cummins/B300 trans
Rated Cap: U/K
I might just try a nylon blade, although Its not too noticeable on the freeway, just around town.
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Old 03-26-2021, 11:06 PM   #4
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Join Date: Aug 2019
Location: Auburn, WA
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Year: 2000
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Chassis: 3000 / 33' Flat Nose
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Some of our buses fans are noisier than all get out. Can't hear the radio (dispatch). Others are super quiet and give off really nice air.

I did a little research and it appears that, yes, the shape of the fan does make a difference. I would also imagine how the blade flexes, not at all or a lot, can make a difference in the noise and harmonics.

I found this brand mentioned for RVs, which should be much quieter than trucks or buses, so the noise level of the fans might be lower???

maradyne 3000

I tried searching using the word "decibels" but not surprisingly, nothing came up. The manufactures probably don't want to discuss that topic much.

Best of luck.
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Old 03-26-2021, 11:27 PM   #5
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Join Date: Jun 2020
Location: Long Beach, CA
Posts: 527
Year: 1998
Coachwork: Blue Bird
Chassis: TC1000, 40' MPV
Engine: 5.9 Cummins/B300 trans
Rated Cap: U/K
I googled maradyne 3000 and came up with a bunch of fans. Most of theirs are all metal construction and they come in a variety of voltages. Thanks
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Old 03-27-2021, 06:48 AM   #6
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Join Date: May 2009
Location: Columbus Ohio
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Year: 1991
Coachwork: Carpenter
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Engine: DTA360 / MT643
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I love those metal fans!! my DEV bus still has its originals complete with the carpenter logos.. totally iconic sound of the harmonics from those running while riding the bus on rainy days as a kid..
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