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Thread: Coolant leak

  1. #1
    Join Date
    Jul 2017
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    1998 740 il

    Coolant leak

    So my thermostat went bad and I replace the entire water pump and had a leak from the hose going to the over flow tank so i took the fan and pump back off new gasket all 3 soft hoses where replaced. Put it back together drove it about 2 miles to tge parts store and started leaking when i turned the car off.

    Im at a lose

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  2. #2
    Join Date
    Jun 2015
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    Takoma Park, MD
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    01 BMW 740il
    Valley pan gasket?

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  3. #3
    Join Date
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    2001 525it
    2nd valley pan, take a look under neath intake manifold

  4. #4
    Join Date
    Jul 2017
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    1998 740 il
    No coolant in Valley

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    Last edited by Myro; 11-04-2017 at 09:48 PM.

  5. #5
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  6. #6
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    2001 740iL Prod 4/2000
    I see dripping from the hose under the waterpump in your 'over' vid......

  7. #7
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    Quote Originally Posted by oldroller View Post
    I see dripping from the hose under the waterpump in your 'over' vid......
    Me to brand new hose and i tightend the clamp w a socket so its defiantly closed

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  8. #8
    Join Date
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    E30 E38 E46 E85 F150 GTI
    Make sure the water pump is seated properly. I did this and also had a bit of an issue getting it sealed up.
    https://www.bimmerforums.com/forum/s...6#post29031626
    2000 740i Sport | 2004 330xi | 1988 325i Vert | 2003 Z4 2.5 | 1995 Ford F150 | 2018 GTI

  9. #9
    Join Date
    Nov 2016
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    Hansville, wa
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    2001 750il Chrome line
    I hate to say it but it looks like it's coming from the weep hole in the water pump where the seal is. A bad pump seal would leak quite a bit.

  10. #10
    Join Date
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    Looks like 3rd times the charm ...i hope.

    Btw anyone know which sensor report ti the temp gauge?

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  11. #11
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    Quote Originally Posted by Myro View Post
    Looks like 3rd times the charm ...i hope.

    Btw anyone know which sensor report ti the temp gauge?

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    The one on the water pump.
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  12. #12
    Join Date
    Dec 2005
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    Upstate SC
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    '00 740i
    You may have pinched one of the O-rings putting the pump back on. I know this from experience unfortunately.
    Last edited by E30SCragtop; 11-07-2017 at 02:04 PM.

  13. #13
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    Quote Originally Posted by acspecialists View Post
    I hate to say it but it looks like it's coming from the weep hole in the water pump where the seal is. A bad pump seal would leak quite a bit.
    Can I replace the seal or no

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  14. #14
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    98 740il, 00 540i,04 ZHP
    Didn't look at the videos, but just wanted to pass on a tip. Use the water pump gasket that has the black bead on the paper. You may have to buy that separately. The just paper gasket that comes with the pumps sucks.
    '98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
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  15. #15
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    1998 740 il
    Quote Originally Posted by racer2086 View Post
    Didn't look at the videos, but just wanted to pass on a tip. Use the water pump gasket that has the black bead on the paper. You may have to buy that separately. The just paper gasket that comes with the pumps sucks.
    problem wound up being the Water pump it self got a beck from adv auto good to go now


    on a side not anyone know if i can get the plug and wire for the tempature sensor without buying the whole harness ??

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