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  #11  
Old 01-02-2022, 11:46 AM
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I have rear climate control but I dont have the 3rd row seating. I didnt have to have a special tool to do my ac belt on my 2013.
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  #12  
Old 01-02-2022, 11:59 AM
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Crystalworks was right, it is a stretch belt on this model. My last N52 (07 328i) just had one single serpentine belt that went around all components. This later updated version has two belts, AC being a stretch belt with no tensioner. I've not seen that before.

This seems helpful:

https://www.xbimmers.com/forums/show....php?t=1035648
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  #13  
Old 01-02-2022, 11:59 AM
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Quote:
Originally Posted by richardb View Post
On a whim I decided to check out the belt on FCP euro. It appears there is a special BMW tool number 83300496084 required to remove/install the AC belt on models with 4-zone climate control (I have this option).

That tool is roughly $150 and will take some time to receive it once ordered. Is that tool necessary for changing an AC belt?

Look on YouTube etc. People have fashioned their own tool out of scrap at home. I would prob use some tire changing levers and hand crank the motor to turn a stretch belt on vs. buy the official tool I'll use twice in the life of the car.


I'd be sad if I pulled=cut the belt and the sound didn't go away.

Harbor freight has the mechanic stethoscope.
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Old 01-02-2022, 06:22 PM
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Put a large screwdriver handle to your ear as you poke around to better identify where the sound is coming from. By chance, when you do that, does it sound like it's coming from the oil filter housing? I'm having trouble deciphering the noise in your video, but oil pumps can sound like what I THINK I'm hearing. It'll sound like it's coming out of the OFH.

AM.
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Old 01-02-2022, 06:45 PM
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I can definitely see oil pump making that sound.
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  #16  
Old 01-02-2022, 08:47 PM
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Listen to the vid from 2:20 to 2:34 you can hear a distinct whine. It kind of sounds like an alternator with bad bearings. Or sometimes you see a junk old GM car with a whiny transmission sound like that.

Very tempted to snip that AC belt off. But I also think it might be DISA related? IDK.
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  #17  
Old 01-02-2022, 09:22 PM
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Unplug disa and confirm unrelated. Or remove disa and look at the flap.

DISA makes a distinct plastic click sound I didn't hear.

Use a stick or large screwdriver to listen for the source. (or FFT app).
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  #18  
Old 01-03-2022, 06:16 PM
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Hey everyone, check out this other video I found: https://youtu.be/k0DDbmPvt0Q

This is exactly what it sounds like. The comment section not really clear on what the final fix was, either AC pulley or vacuum pump.

This is the vacuum pump: https://www.fcpeuro.com/products/bmw...44-11667558345

Thoughts?
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Old 01-03-2022, 06:54 PM
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The stethoscope/long screwdriver will tell you. So would cutting the AC belt. Installing them without a tool sucks. I ordered the Lisle 59370 tool for our E70 diesel for a reasonable cost. Maybe you can find one suitable for the N52 in your 35i?
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  #20  
Old 01-03-2022, 07:08 PM
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Yes yes, I will order the Lisle stethoscope haha.

Ok, it's 26 degrees out and I was desperate enough to hack off the AC belt. Easiest way forward considering it's a stretch belt.

I cut the belt off and.... the noise is still there!!!

So it's not the alternator, power steering pump, or AC compressor.

Could this be the vacuum pump?
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