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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-15-2007, 02:03 PM   #1
cjeezy
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Join Date: Aug 2006
Location: Boardman, Ohio
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Why does my car sound like a semi truck at slow speeds in the heat?

Anyone's cars ever sound really load at times when your driving at slow speeds? Mine gets very loud, almost like its sucking in a ton of wind when its hot out and I'm in stop and go traffic.

Last edited by cjeezy; 06-15-2007 at 02:46 PM.
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Old 06-15-2007, 02:07 PM   #2
BlkE4600
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It's your mechanical fan...it's triggered when your temp gets to a certain level (don't know what exactly the temp is). Mine does the same thing....slowly dissipates the higher gear ya go....usuallly is totally gone by the bottom of third....correct?

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Old 06-15-2007, 02:13 PM   #3
slog7
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I have the exact same problem...it sounds like a loud truck but right when you go past 30mph its fine.

But this only happens on really hot days(90 degrees plus)
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Old 06-15-2007, 02:26 PM   #4
cjeezy
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Yeah it goes away once the speed gets around 30 MPH or so. The car runs fime, it just sounds like truck. Hopefully the car getting that hot won't do any damage to the engine
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Old 06-15-2007, 03:08 PM   #5
jmueller
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its fine.. its getting loud for a reason.. i wish i could set the fan to run on a switch.. either auto or on.. i had this done in my maxima when i went to the track you could keep the car engine extra cool for more power
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Old 06-15-2007, 04:27 PM   #6
ms328i
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had same problem and i just recently changed my thermostat, belts, and coolant and problem solved. so far so good after a month.
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Old 06-18-2007, 04:12 PM   #7
james2538
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So this is normal?

Ugh... I thought I had a leak in the air intake.
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Old 06-18-2007, 04:48 PM   #8
yanksfan e46
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same thing here... sounds terrible but id rather have that fan go on then overheating my engine....
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Old 06-19-2007, 11:02 AM   #9
markusmark
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Automatics have a mechanical fan that has a thermally activated clutch. The noise is the fan sucking air through the AC condensor and radiator.
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