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2001 BMW 330i
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11 Posts
Discussion Starter · #1 ·
It’s a nice day and I decided to do a visual inspection underneath my 330i. I noticed this hose which looks like it connects to the back of the alternator but with nothing attached from the front. Is something missing or does the car come like this?
932010
 

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2004 325i automagic
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3,411 Posts
From what I remember I want to say yes there should be a duct connecting to the left air "tunnel" that routes air toward the brake rotor ... but not 100% sure ... mine doesn't have that.

Edit: leaving it like that won't hurt anything, just clear out any leaves or nests that are in there.

Look up parts diagrams at www.realoem.com
Enter last 7 digits of VIN to bring up your car
 

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2001 BMW 330i
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11 Posts
Discussion Starter · #4 ·
From what I remember I want to say yes there should be a duct connecting to the left air "tunnel" that routes air toward the brake rotor ... but not 100% sure ... mine doesn't have that.

Edit: leaving it like that won't hurt anything, just clear out any leaves or nests that are in there.

Look up parts diagrams at www.realoem.com
Enter last 7 digits of VIN to bring up your car
Yeah I figured it was to cool the alternator but wanted to make sure.
 

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2001 BMW 330i
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11 Posts
Discussion Starter · #7 ·
I'd be more intersted in the coolant on the blue drain plug, and teh dried coolant spots.
BTW, looks like alt duct.
Not coolant, It’s oil. I suspect is coming from the oil filter housing. The entire coolant system was replaced about 8 months ago.
 

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1,434 Posts
It’s a nice day and I decided to do a visual inspection underneath my 330i. I noticed this hose which looks like it connects to the back of the alternator but with nothing attached from the front. Is something missing or does the car come like this?
You are missing this. I guess it helps to keep water, leaves and other road debris away from the back of your alternator which is a useful thing to do.

 

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BMW 320i 2002 e46 5spd manual RHD
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631 Posts
Mine is also like that, and have no opening in my brake duct to connect an exta duct to, so i dont know if all of them came with the extra duct
 

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OEM ///PLUS
2003 M3 6MT Slicktop
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23,819 Posts
yeah unless something changed you should have a duct running to the brake air inlet ducting.
as mentioned it’s for cooling the alternator. early in the forum days some people reported having removed it only to have alternator prematurely fail. it’s hard to say if one directly caused the other since they were tracking the cars. but it sure seemed to correlate a cause and affect.
I would replace. make sure the belt doesn’t hit it.
 

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49 Posts
Definatly fine the other piece as oil dust leaves and heat kill the alternator, cooler air front front. Also good idea when doing repairs that expose alternator, remove it and the plastic cover and blowout all the built-up crud
 

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2004 325i automagic
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3,411 Posts
Mine is also like that, and have no opening in my brake duct to connect an exta duct to, so i dont know if all of them came with the extra duct
Fwiw, if you have the alternator duct but no opening in the brake duct, it's possible that one of the two was replaced at some point with the "wrong" part.
 

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What happen to me is ducking dislodged very rainy day and battery light came on/off then on, when I pulled the regulator off the bushes had burned up and to finish the core it melted the stator(contact point copper coating). everything coated with wet slugs
 
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