C32 AMG, C55 AMG (W203) 2001 - 2007

High pitched whine - voltage regulator?

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Old 04-06-2011, 11:10 PM
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High pitched whine - voltage regulator?

When I first start up the car, I get a high pitched whine for a little bit. It eventually goes away. It also sometimes comes back when I come to a stoplight.

I wonder if this is the voltage regulator? And if so, is it on it's way out? I haven't noticed (at least I don't think) any power blips. The regulator is a pretty common problem on these cars, I'm just wondering if I should go ahead and buy a spare just in case and put it on the shelf.
Old 04-06-2011, 11:22 PM
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I have this exact same thing, usually upon startup and every so often at stop lights when the engine has not reached running temp yet. Any insight here is much appreciated.
Old 04-06-2011, 11:23 PM
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Originally Posted by Viper98912
When I first start up the car, I get a high pitched whine for a little bit. It eventually goes away. It also sometimes comes back when I come to a stoplight.

I wonder if this is the voltage regulator? And if so, is it on it's way out? I haven't noticed (at least I don't think) any power blips. The regulator is a pretty common problem on these cars, I'm just wondering if I should go ahead and buy a spare just in case and put it on the shelf.
i talked to my mechanic regarding the same thing and someone correct me if i'm not wording right, but that's some sort of pump blowing cold air. it's pretty loud normally. as in don't worry about it IMO.

Last edited by MIKESV8; 04-06-2011 at 11:29 PM.
Old 04-07-2011, 12:37 AM
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air pump. mine's loud too. my oil pump is really loud also.
Old 04-07-2011, 05:43 AM
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It's not the air pump, the air pump lasts longer during startup only and sounds like a loud broken bearing. This is a very high pitched whine, similar but louder than HID ballast whine.
Old 04-07-2011, 05:46 AM
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How long does it last? I have something as well but it lasts a few seconds..
Old 04-07-2011, 07:03 AM
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Originally Posted by mikekuriger
air pump. mine's loud too. my oil pump is really loud also.
My dealer and I came to the conclusion that my oil pump is loud also. A little nervous about that, but no abnormal metals or anything found in oil analysis so I guess it's ok.
Old 04-07-2011, 09:43 AM
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Originally Posted by Viper98912
It's not the air pump, the air pump lasts longer during startup only and sounds like a loud broken bearing. This is a very high pitched whine, similar but louder than HID ballast whine.
Again, spot on description Viper. The reason this thread struck a chord with me was because I was hearing this very noise on the way home from work yesterday.
Old 04-07-2011, 11:23 PM
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I guess it just seems like it's been sounding louder and longer lately, so I was just curious to know if anyone who's had a VR replaced noticed any issues before it went out.

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