Whistle sound?

E90Company · 08-23-2012, 02:56 PM

Hey guys,

I have this high pitch whine/whistle sound coming from the front of the car, every time I switch the AC on. It happens when you hear the fan kick on. Any ideas on what this could be? Here is a video:

Thanks.
Nick

E90Company · 08-30-2012, 07:23 PM

Bumpy

spool twice · 08-30-2012, 08:32 PM

Do you have a BT tool? It could either be the A/C compressor or anything else that turns on with the A/C compressor comes on (like the engine fan and related parts)

pits200 · 08-30-2012, 08:34 PM

Sounds like the pulley bearing is not doing that great.

E90Company · 08-30-2012, 08:42 PM

Quote:

Originally Posted by spool twice

Do you have a BT tool? It could either be the A/C compressor or anything else that turns on with the A/C compressor comes on (like the engine fan and related parts)

I don't. I did scan for codes, and didn't have any (if that helps)

Quote:

Originally Posted by pits200

Sounds like the pulley bearing is not doing that great.

What does it mean?

spool twice · 08-30-2012, 08:45 PM

BT tool can read more than OBD-II codes, it can read BMW specific diagnostic codes, run diagnostic tests on just about anything on the car, and test what seems like a ton of things to see what really is the problem.

spool twice · 08-30-2012, 08:46 PM

Quote:

Originally Posted by E90Company

I don't. I did scan for codes, and didn't have any (if that helps)

What does it mean?

Pulley bearing is on the ACC belt system. You can try to open your hood and put your ear (or video camara) close to any part of the engine (while it's on) to see if you can determine where it's at.

pits200 · 08-30-2012, 08:47 PM

Quote:

Originally Posted by E90Company

I don't. I did scan for codes, and didn't have any (if that helps)

What does it mean?

Meaning it may need to be changed before it seizes up. Once again, this is all speculation. Look near the serpentine belts and see if you notice abnormal wobble.

E90Company · 08-30-2012, 08:49 PM

Quote:

Originally Posted by spool twice

Pulley bearing is on the ACC belt system. You can try to open your hood and put your ear (or video camara) close to any part of the engine (while it's on) to see if you can determine where it's at.

I hear the issue at either the fan or pulley with the hood open. When the AC is on max, as soon as the fan kicks up to full it starts. Only happens at max speed of the fan.

E90Company · 08-30-2012, 08:50 PM

Quote:

Originally Posted by pits200

Meaning it may need to be changed before it seizes up. Once again, this is all speculation. Look near the serpentine belts and see if you notice abnormal wobble.

Thanks, I will check. See if it's wobbling at idle?

E90Company · 08-30-2012, 10:17 PM

Anyone else? Is this a huge issue that I should bring to the dealer right away or something minor?

E90Company · 08-31-2012, 07:44 AM

Ok. This morning I went out to check the serpentine belt, and there appears to be a slight wobble on it that is very minor. The sound only occurs though when it's hot outside and the air is on MAX. This morning it didn't occur because it was a little cooler, even with the air on MAX

pits200 · 08-31-2012, 08:10 AM

Quote:

Originally Posted by E90Company

Ok. This morning I went out to check the serpentine belt, and there appears to be a slight wobble on it that is very minor. The sound only occurs though when it's hot outside and the air is on MAX. This morning it didn't occur because it was a little cooler, even with the air on MAX

You probably know this but make sure you don't perceive a wobble for dirt which creates and optical illusion of a wobble.

It can't hurt to take it into the dealer, its probably nothing urgent if it only happens intermittently. We all know what will happen though, the problem wont show when at the dealership and they'll send you home.

Best thing to do is take a video of when it happens at home and show the dealership when you take it in so they can see what you mean in regard to the issue.

Goodluck

E90Company · 08-31-2012, 08:16 AM

Quote:

Originally Posted by pits200

You probably know this but make sure you don't perceive a wobble for dirt which creates and optical illusion of a wobble.

It can't hurt to take it into the dealer, its probably nothing urgent if it only happens intermittently. We all know what will happen though, the problem wont show when at the dealership and they'll send you home.

Best thing to do is take a video of when it happens at home and show the dealership when you take it in so they can see what you mean in regard to the issue.

Goodluck

Thanks for the help man. You might be right about the dirt, I just looked at it real fast when the car was already on.

I think i'll probably end up leaving it, and bring it up when I am at the dealer for scheduled service in December.

Slops · 08-31-2012, 09:04 AM

when i read the title, it reminded me of this vid....

E90Company · 08-31-2012, 09:19 AM

Lol!

benzy89 · 08-31-2012, 09:59 AM

Thought you got banned??

Since you don't have a BT Tool, you could go to an AutoZone/NAPA (or any other parts place with an OBD Scan Tool) and see if you can get a fault code (if there is one)

ihc95 · 08-31-2012, 10:28 AM

Quote:

Originally Posted by Slopp

when i read the title, it reminded me of this vid....

wtf did I just watch

E90Company · 08-31-2012, 06:51 PM

So I looked over all of the pulley's when I was at idle, everything appeared to be perfectly "on" except for this one pulley. I made a video of it here:

In the video, the air was on MAX but wasn't making the noise. I noticed the whine only when the fan kicks on to full.

E90Company · 08-31-2012, 08:55 PM

E90Company · 09-01-2012, 04:58 PM

bumpy

08-23-2012, 02:56 PM	#1
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Whistle sound? Hey guys, I have this high pitch whine/whistle sound coming from the front of the car, every time I switch the AC on. It happens when you hear the fan kick on. Any ideas on what this could be? Here is a video: Thanks. Nick
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08-30-2012, 07:23 PM	#2
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Bumpy
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08-30-2012, 08:32 PM	#3
spool twice Rainbow Racer 1008 Rep 2,539 Posts Drives: BMW M4cs Join Date: Sep 2010 Location: Tampa Bay, FL Area iTrader: (7) Garage List 2019 M4cs [0.00]	Do you have a BT tool? It could either be the A/C compressor or anything else that turns on with the A/C compressor comes on (like the engine fan and related parts) __________________ -Loe P.- Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU \| Pullies + basic bolt-on mods \| 10.861@127.90mph ] Current Car: F82 M4cs \| TT-RS \| On Order: i4 M50
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08-30-2012, 08:34 PM	#4
pits200 Colonel 547 Rep 2,590 Posts Drives: 09 335i X-Drive Black Sapphire Join Date: Mar 2010 Location: Pittsburgh iTrader: (1)	Sounds like the pulley bearing is not doing that great.
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08-30-2012, 08:45 PM	#6
spool twice Rainbow Racer 1008 Rep 2,539 Posts Drives: BMW M4cs Join Date: Sep 2010 Location: Tampa Bay, FL Area iTrader: (7) Garage List 2019 M4cs [0.00]	BT tool can read more than OBD-II codes, it can read BMW specific diagnostic codes, run diagnostic tests on just about anything on the car, and test what seems like a ton of things to see what really is the problem. __________________ -Loe P.- Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU \| Pullies + basic bolt-on mods \| 10.861@127.90mph ] Current Car: F82 M4cs \| TT-RS \| On Order: i4 M50
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08-30-2012, 10:17 PM	#11
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Anyone else? Is this a huge issue that I should bring to the dealer right away or something minor?
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08-31-2012, 07:44 AM	#12
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Ok. This morning I went out to check the serpentine belt, and there appears to be a slight wobble on it that is very minor. The sound only occurs though when it's hot outside and the air is on MAX. This morning it didn't occur because it was a little cooler, even with the air on MAX
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08-31-2012, 09:04 AM	#15
Slops Major General 188 Rep 5,417 Posts Drives: 2005 C55 AMG Join Date: Jan 2011 Location: Oxford iTrader: (2)	when i read the title, it reminded me of this vid....
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08-31-2012, 09:19 AM	#16
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Lol!
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08-31-2012, 09:59 AM	#17
benzy89 Banned 79 Rep 2,396 Posts Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ iTrader: (3) Garage List 2008 BMW 335i [7.50]	Thought you got banned?? Since you don't have a BT Tool, you could go to an AutoZone/NAPA (or any other parts place with an OBD Scan Tool) and see if you can get a fault code (if there is one)
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08-31-2012, 06:51 PM	#19
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	So I looked over all of the pulley's when I was at idle, everything appeared to be perfectly "on" except for this one pulley. I made a video of it here: In the video, the air was on MAX but wasn't making the noise. I noticed the whine only when the fan kicks on to full.
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08-31-2012, 08:55 PM	#20
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)
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09-01-2012, 04:58 PM	#21
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	bumpy
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