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Thread: Strange Whine Noise - What could it be??

  1. #26
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    might want to be carefull removing drive belt from the system if the alternator is run by it the alternator may go full tilt trying to produced the volts without it spinning have seen them go up in smoke when doing this maybe carefully disconnect and don't arc the wires etc. for the alternator wiring harness first then try running without the belt....

  2. #27
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    Quote Originally Posted by chemmech View Post
    any oil leaks from the power steering pump area or seepage, the 2 hose clamps on the supply line to the reservoir maybe slightly loose allowing air to get sucked in when running maybe slightly aerating the power steering fluid etc. excessive noise not likely but the clamps can loosen up etc.
    I replaced the lines a while ago - no signs of leakage or anything of the type. Car isnít leaking anything at all right now.
    E38 1998 740iL - Arctic Silver Metallic - 175k - countless retrofits, I'll list them here someday.
    BMW CCA # 573127

  3. #28
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    Did you try turning the AC off?

  4. #29
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    Quote Originally Posted by Old525i View Post
    Did you try turning the AC off?
    Yeah, A/C off doesnít change the noise at all.

  5. #30
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    Jun 2014
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    atlanta ga
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    2001 740i
    That sounds exactly like mine did. It was the fan clutch, but it was not defective, it worked fine. It also would whine with the the fan removed. Very odd, and first clutch was no better. Second clutch did the trick. I found a belt to bypass the power steering pump as well which helped isolating the noise.

  6. #31
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    Found my old thread, if you want to bypass power steering pump only I’ve got the belt and routing shown here.
    https://www.bimmerforums.com/forum/s...ame-that-tune!

  7. #32
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    Quote Originally Posted by sdb999 View Post
    Found my old thread, if you want to bypass power steering pump only Iíve got the belt and routing shown here.
    https://www.bimmerforums.com/forum/s...ame-that-tune!
    Wow! That sounds absolutely identical. Will be ordering a fan clutch. I did the same thing as you and took the fan itself off. Will try to take the whole clutch off tomorrow and see how it goes.
    E38 1998 740iL - Arctic Silver Metallic - 175k - countless retrofits, I'll list them here someday.
    BMW CCA # 573127

  8. #33
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    Couple of updates on this one. I did a full service on my car over the weekend (just hit 170k!) and dropped the pan to find no plastic bits at all and everything in good shape. I also took pictures of the guides this time, so if anyone sees anything I can't, definitely let me know!

    I also pulled the accessory belt off and found that my belt tensioner sounded like the bearings were shot 10 years ago, so I replaced it with a new one. Starting the engine with the belt off, the noise was much better. After replacing the tensioner, the noise quieted down a bit but was still there, quieter at idle, but still there while revving the engine. I also drove around a few days without the fan clutch at all and the noise didn't change then either, so I am now pointing to the A/C compressor or the belt tensioner for that belt. Turning the A/C on and off doesn't change the noise. I will be taking that belt off in a few days and see what happens.

    Thanks everyone for your help!
    IMG_1363.jpgIMG_1367.jpgIMG_1366.jpg
    E38 1998 740iL - Arctic Silver Metallic - 175k - countless retrofits, I'll list them here someday.
    BMW CCA # 573127

  9. #34
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    My vote would be a fan clutch as well, try holding the RPM at 2500 while parked and you should hear it clutch out. If you do replace it get and E65 fan and clutch.
    01' 750il Chromeline
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  10. #35
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    Quote Originally Posted by acspecialists View Post
    My vote would be a fan clutch as well, try holding the RPM at 2500 while parked and you should hear it clutch out. If you do replace it get and E65 fan and clutch.
    The fan clutch works fine, it clutches out right at 2500rpm. Itís brand new as of January. Driving around without the clutch at all didnít get rid of the sound.
    E38 1998 740iL - Arctic Silver Metallic - 175k - countless retrofits, I'll list them here someday.
    BMW CCA # 573127

  11. #36
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    uh collapsed bottom radiator hose? trans fluid type? just some "wild cards".....

  12. #37
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    I doubt it's the bottom hose though recently changed all my radiator hoses out and the bottom hose was rock solid even had some factory paint across it "E38" think it was the original hose .....

  13. #38
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    Quote Originally Posted by chemmech View Post
    uh collapsed bottom radiator hose? trans fluid type? just some "wild cards".....

    Everything cooling system was also done in January after the cooling fan exploded and took out my tooth, haha. Transmission was done a few months ago and is all ZF Lifeguard fluid with an OEM filter. I'm honestly just about out of ideas other than just living with it.
    E38 1998 740iL - Arctic Silver Metallic - 175k - countless retrofits, I'll list them here someday.
    BMW CCA # 573127

  14. #39
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    zf lifeguard me too, actually the top hose had the paint "M 62" it unfortunately was going bad the outer rubber cover was falling off the inner part no fluid was lost though whew.....

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