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Thread: Restoring a 2001 750iL that sat for 3 years

  1. #101
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    Took the car for a short spin, the electric fan is not running, even when blasting the A/C but the engine is not overheating.

    I also replaced both battery. Bough 2 big ones, but the top one doesn't fit. its doesnt go in, too long.

    Whats the right battery size for the top one?

    Here are the battery I got from Autozone: http://www.autozone.com/batteries-st...20339_910031_0

    BCI Cold Cranking Amps (CCA): 950
    Cranking Amps (CA): 1000

  2. #102
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    00 BMW 750


    Here is a battery chart of the batteries you can use for the lower battery. For the upper battery, it is smaller in size. I believe you can use a 48/H6 or a 94R/H7 battery.

  3. #103
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    Once you get DUDMD's cat software, you'll be able to dump the small battery or just use it for extra juice. But yea, an smaller will have to do for the top one.
    Last edited by XAlt; 02-20-2017 at 07:30 PM.

  4. #104
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    I guess I will replace the top one with a 48H6...

  5. #105
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    Auxiliary fan not turning on when A/C is turned on. Do I have to remove the front bumper in order to remove the fan?

  6. #106
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    Quote Originally Posted by masu3701 View Post
    Auxiliary fan not turning on when A/C is turned on. Do I have to remove the front bumper in order to remove the fan?
    Yes, but removal and reinstall is very easy to do.
    '01 740i Sport MKIV, Quad Brake Lights, OEM Bi-Xenon retrofit, LED Angel Eyes, HID Fogs, LED Plate Lights, Dinan 7 certification, BM53 radio, OEM Sirius, Aux Input, TCU Bluetooth, Intravee II, iPod, Strong Strut, Dinan Struts, Springs, Camber Plates, Intake, MAF, CAI, Exhaust and Throttle Body

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  7. #107
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    Quote Originally Posted by 740iSport303 View Post
    Yes, but removal and reinstall is very easy to do.

    Ok. Is that fan the same as the one on 740s?

    Also is that fan suppose to come on when a/c turned on even in the winter? Mine doesnt turn at all, but engine not overheating.

  8. #108
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    I believe the fan would be the same across both 740s and 750s.

    I would think that the fan would not be needed during winter. But I'm not sure. Lets wait for someone to chime in.

    On the bright side, the engine is not overheating now.

  9. #109
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    Aux fan is only really needed on super hot days with the A.C. running, or when the fan clutch goes out.

  10. #110
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    Quote Originally Posted by XAlt View Post
    Aux fan is only really needed on super hot days with the A.C. running, or when the fan clutch goes out.
    Thats what I was thinking, but a friend of mine thinks that its should go on whenever the a/c is turned on which made me think that my fan is bad.

  11. #111
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    Yeah, it's probably bad. Should always go on with the AC, but it's not an essential part.

  12. #112
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    Quote Originally Posted by XAlt View Post
    Yeah, it's probably bad. Should always go on with the AC, but it's not an essential part.
    What do you mean its not essential?

  13. #113
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    Quote Originally Posted by masu3701 View Post
    What do you mean its not essential?
    As in you won't overheat with it broken, but if the clutch fan goes, that won't be good.

  14. #114
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    Quote Originally Posted by XAlt View Post
    As in you won't overheat with it broken, but if the clutch fan goes, that won't be good.
    Right, right now I am trying to determine if its broken or not as the fan doesnt turn on when a/c on,
    but at the same time some people are saying it wont turn on even if a/c is on because its cold outside,
    and other are saying it should always turn on when a/c is on.

  15. #115
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    If it's above 50, it'll come in.

    Otherwise no.

  16. #116
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    Quote Originally Posted by XAlt View Post
    If it's above 50, it'll come in.

    Otherwise no.
    we are in the mid 30s

  17. #117
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    Quote Originally Posted by masu3701 View Post
    we are in the mid 30s
    There you go.

    Nothing to see here, everything's fine.

  18. #118
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    Quote Originally Posted by XAlt View Post
    There you go.

    Nothing to see here, everything's fine.
    Will see once the weather get better, but all checks out good so far. Drove the car yesturday and I cant find anything wrong with the transmission. It shifts good.
    Next I will replace all the fluid, and maybe the gaskets.

    Then will start working on replacing front and rear suspension as I can hear clunks and funny noises when driving on uneven roads.

  19. #119
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    Get an OE BMW filter for the trans, fluid drain is useless without that.

  20. #120
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  21. #121
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    Quote Originally Posted by XAlt View Post
    Get an OE BMW filter for the trans, fluid drain is useless without that.
    Was testing the transmission this evening, and notice that its jumping (hesitate to move by a short delay, then force to move) if when parked i put it in reverse, let the car start rolling back a lil bit then brake and move it to Drive.
    Its fine if I roll back in reverse, move to park then put it in drive, or from neutral to drive. It only jump if i start moving in reverse then to drive.

    Is that normal.? I hope it makes sense

  22. #122
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    Yeah, it's a delay in shifting/hesitation.

    Old fluid and a worn filter can cause that.

  23. #123
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    Quote Originally Posted by XAlt View Post
    Yeah, it's a delay in shifting/hesitation.

    Old fluid and a worn filter can cause that.
    Its more of a delay fallow by a slam. Also like wifes differential on her 04 grand cherokee.

    It only does it if i go reverse, brake, then drive. If i go reverse, brake, nuetral then drive or park then drive it will not slam into gear

  24. #124
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    Quote Originally Posted by masu3701 View Post
    Its more of a delay fallow by a slam. Also like wifes differential on her 04 grand cherokee.

    It only does it if i go reverse, brake, then drive. If i go reverse, brake, nuetral then drive or park then drive it will not slam into gear
    Maybe motor mounts, but more likely reduced fluid flow.

    Just get the filter and ATF changed and report back. That's basically the key to getting the 5HP30 to outlast the rest of the car.
    Last edited by XAlt; 02-23-2017 at 08:18 AM.

  25. #125
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    Been trying to trace a coolant leak but cant find it. I would top it off, drive for a bit, then coolant would be low next time I check it.
    Did compression test, losing pressure very slowly but cant find any leaks. Any suggestions?

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