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#1
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Help me identify this strange N52 whine noise! (E70 X5 30i)
Have a listen to this video, you can really hear the noise well at the 2:00 minute mark. Thanks for your help! video link: https://youtu.be/-RhC8lShuMQ |
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#2
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I feel like this might be the AC compressor or compressor pulley failing. Has anyone replaced the pulley alone?
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#3
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I don't hear anything crazy, but I'm sure it's worse in person. You could pull the AC belt to diag that pulley/compressor specifically. Though, I think it's a stretch belt so that kinda sucks. Have you tried a mechanic's stethoscope? Those have worked out well for me in the past when diagging pulleys or random noises.
Side note, congrats on almost 35k subs. Went ahead and subbed for an assist.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#4
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The literal last thing I fixed on a car was the AC belt tensioner. The quickest way to test is a sharp knife and remove the belt
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#5
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Quote:
I haven't used one in years, but I may have to pick up a stethoscope to add to my tool kit. Not a bad idea! |
#6
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I'm thinking it may be AC compressor (pulley on the compressor itself) or someone mentioned in the comments to check the DISA valves. The DISA noise videos sound very similar. |
#7
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DISA failure chatter/clicking sound. Having had that failure on both of our e53 it didn't remind me of that sound at all.
Were that my car in winter that AC belt would have a very short rest of its life. FYI razor blade was the removal method used for my afformentioned repair (because I didn't want to have to deal with removing serp belt to confirm my diagnoses). Instantly the noise went away.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#8
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Before cutting the AC belt first pull the oil fill cap. Somebody had a similar noise from a vacuum problem sucking air through a broken part. You can unplug disa to eliminate.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#9
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Figured this was going to be that pcv valve noise Im dealing with on my parents 535ix. When the valve fails it blows by the main seals but that requires a turbo involved and that's definitely not the noise you have
Mine made similar noises when I had a bad idler pulley on the main belt. So I would imagine it could be the a/c idler pulley.
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Just BMW's - All cars and trucks was two pages long 1994 318is 1997 528i 2000 323i 2001 X5 3.0 auto 2005 X5 3.0 auto 2011 535xi auto 2013 X5 xdrive35 Turbo More are at my website Aftermarket E53 Radio Install |
#10
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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? |
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n52 noise |
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