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Thread: Coolant Problem....

  1. #26
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    '97 BMW 725tds e38
    Thats the Problem!....the only screw i found is Behind the bumper at the bottom of the Radiator so i guess that one's for draining. Thats a reason why im getting Desperate because im at the end of my grammar with that Car....😂

  2. #27
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    Then you will have to bleed it with the expansion tank cap - but this can only be done up to an engine temperature of 70C or so.....
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  3. #28
    Join Date
    Nov 2016
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    Hansville, wa
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    2000 740il
    Funny thing I have to chime in with. Why do european cars have such terrible cooling systems? I have dumped and refilled hundreds of US cars with no problems. Based on my limited knowledge BMW's suck, Mini's suck na Audi's suck. They suck so bad that you risk ruining your engine any time you drain the coolant. I ruined my Audi because the temp gauge was in the radiator and the idiot light was in the engine. It had a dual acting thermostat to short cycle the coolant. It failed so the engine got cooked with plenty of good coolant in the radiator and the gauge reading normal.

    I just lost a heater hose on my suburban and it got hot and I kept on driving. Got home, fixed the leak, filled her up and away I went.
    00' 740il Dinan, CAI, Romulus exhaust, Stage 2 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Track monster!
    03' 525i wagon for the wife
    98' 740i for the daughter
    Wrecked, 92' 525i with over 200k, rollover. Wrecked, 02' R1200 CLC, hit by a bus and broken in half. That one made the news!
    It's like herpes there is no cure but if treated properly you can live with it for the rest of your life

  4. #29
    Join Date
    Jan 2018
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    Lithuania
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    '97 BMW 725tds e38
    The worst Part is that each time i brought the Car to my mechanic, He badly repaired the actual Thing but Then i have another issue thats even worse! Like this year, i let him replace the rear wishbones and the Front traction Arms ( i Hope you call Them that ) and after that was replaced i got a very nice surprise! A k a my coolant Problem right now....😥 I think i need to start learning how i can do all that stuff on my own...because i Spend thousands on that Car and most of the Part due to my mechanics messy repairing.....😒

  5. #30
    Join Date
    Aug 2017
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    Wayne,PA
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    740iL (E38 '01)
    These cars have too many issues to have a mechanic fix it. Even if you found a good one it's just way too expensive. Most of the things are quite easy to fix yourself.

  6. #31
    Join Date
    Mar 2018
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    Bella Vista, Ar
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    2001 BMW 740iL
    Quote Originally Posted by acspecialists View Post
    Funny thing I have to chime in with. Why do european cars have such terrible cooling systems? I have dumped and refilled hundreds of US cars with no problems. Based on my limited knowledge BMW's suck, Mini's suck na Audi's suck. They suck so bad that you risk ruining your engine any time you drain the coolant. I ruined my Audi because the temp gauge was in the radiator and the idiot light was in the engine. It had a dual acting thermostat to short cycle the coolant. It failed so the engine got cooked with plenty of good coolant in the radiator and the gauge reading normal.

    I just lost a heater hose on my suburban and it got hot and I kept on driving. Got home, fixed the leak, filled her up and away I went.

    Yeah, my Porsche's are like nuclear science to get burped completely. I really think maintaining a nuclear reactor would be more simple. But to be honest my Acura Legend was a total pain as well. Sometimes took weeks or months to get it totally air-free. I never really had to worry about it much on any of my american cars. Fill it and go.
    2001 740iL "Silver Beauty"
    1986 Porsche 951 "Silver Bullet"
    1987 Porsche 944 NA Auto (rebuilding for my son's first car)
    https://home.doonze.net/filepage.php <- BMW/Porsche doc's and files, work in progress

  7. #32
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    Jan 2018
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    '97 BMW 725tds e38
    Quote Originally Posted by Timm View Post
    Then you will have to bleed it with the expansion tank cap - but this can only be done up to an engine temperature of 70C or so.....
    How am i supposed to do it?
    Right now im anyways Not at Home but still good to know already so that i can prepare myself for hopefully saving my Car...😅

  8. #33
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    '97 BMW 725tds e38
    Could the Thermostat be a reason for my problems? Or still Air in the system?

  9. #34
    Join Date
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    99 840ci Sport Indv
    The best way to find coolant leaks is to pressurise the system - there are loads of cheap kits to do this - and if you buy a replacement expansion tank cap you can make your own by fitting a valve to that....
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
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  10. #35
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    Mar 2018
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    2001 BMW 740iL
    Harbor freight has several. Amazon is also a good source. I'm thinking of swapping to Evans, and I'll pick one up then. Need one for my Porsche's anyways, they are just as bad as these.

    Sent from my SM-G965U using Tapatalk

    Edit:

    Sorry Timm, realized you were talking about leaks here. You can also use the pressure testing kits to get a better burp of the system, can help getting all the air out. Some guys swear by it.
    Last edited by 951Dreams; 06-14-2018 at 06:55 PM.
    2001 740iL "Silver Beauty"
    1986 Porsche 951 "Silver Bullet"
    1987 Porsche 944 NA Auto (rebuilding for my son's first car)
    https://home.doonze.net/filepage.php <- BMW/Porsche doc's and files, work in progress

  11. #36
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    Jan 2018
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    '97 BMW 725tds e38
    Alright im Back Home and Back on Track for repairing my 725....
    How exactly am i supposed to bleed the system at 70C with the Expansion Tank? Can Something Go wrong or could i make Something worse If i dont do it correctly?

    Thanks in advance!

  12. #37
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    Use the same routine:

    http://www.meeknet.co.uk/E38/E38_Ble...ing_System.htm

    ....but instead of opening the bleed screw loosen the expansion cap - but, this can only be done up to around 70C otherwise coolant will shoot out!
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

  13. #38
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    '97 BMW 725tds e38
    Alright, i have Bled the system and followed exactly each step of your instruction, First Thing i noticed right away as the Car was at its optimal temperature, the Car didnt Shake, Not a little Bit Like before my Problems. So i figured maybe my car's running again normal? Atleast i Hope so, in a couple of days i need to tow a heavy load Trailer anyways so i can tow with my BMW for Testing to see If everything works properly as it should. And after a couple of Tests nearby im going to Dare and Drive further distances But that will still need a time due to my overly scheduled Work Times 😂.
    So thanks in advance If my Car will Run normal again! 😃

  14. #39
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    '97 BMW 725tds e38
    Its me again! Lol....
    Same issue...

    I have literally removed every coolant Hose and pretty much drained the engine aswell along with the Radiator, i Tried to get Into the engine to the head gasket but since i wouldve needed to readjust the Timing Chain i have fit the engine parts Back on, refilled and Bled the cooling system, the only Problem is that i cant Test Out the Car until i get the gasket for the Vacuumpump because its leaking oil.
    My question is , could the Radiator be the issue of my coolant Problem? Because since i replaced it, my coolant was always more than normal, with that i mean that my engine is getting hotter than usual and thats the cause of my issue? I think that my mechanic Put a cheap Chinese Radiator in my 725 and maybe a to little aswell, its also lightly dented in some places.
    After i fix the oil leak, im going to Check how hot the engine really gets.
    After that i will Upgrade my Progress

    Any Help is appreciated!

  15. #40
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    Jan 2018
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    '97 BMW 725tds e38
    I should be able to fetch the gasket tomorrow, after i installed it, im going to let warm Up the Car and Check the engine temperature.
    What is the healthy Temperature Range for a 725tds? I Tried to search for it but didnt find anything useful.

    Help is appreciated in any way!
    Thanks in advance

  16. #41
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    Jan 2018
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    '97 BMW 725tds e38
    The oil leak is sealed, the Car runs Smooth Like Always except that my Car is overheating now, i let him Run til 118 C. After i let him cool down i will bleed the System once again and After that im going to try him again.
    My question now.... If the Cars still overheating After bleeding, what Other reasons could make my Car or any Car overheat? ( Except Head gasket )

    2nd question... What If the Radiator was Bad From Beginning on and the Car was Just programmed that the Temperature gauge stays in the middle? The Car also never smelled of coolant when warm, since i Got that new Radiator it Always smelled From it.

    3rd question...are the Temperatures the Same From the different engines types at the e38's? Like, whats the healthy Temperature for a 740i? And would it be the Same as to my 725tds?

    Thanks in advance!

  17. #42
    Join Date
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    99 840ci Sport Indv
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

  18. #43
    Join Date
    Jan 2018
    Location
    Lithuania
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    My Cars
    '97 BMW 725tds e38
    310 and 3 weeks later...Head gasket replaced....Car runs, pulls good Maybe better than before but while i was taking him Home i Heard weird noices coming from the engine ( occured while driving and continued Afterwards even at idling) . Turns Out that probably the Chain tensioner is Broken and needs fixing, means i need to Return him tomorrow once again ...😥

    I Wonder when my Car will Run normal again, Maybe never Maybe After this service. Who knows what will occur next.
    But i know one Thing. As much as i want to keep that Car, If it brakes one more time, i have to sell that Car.
    I spent meanwhile thousands on that Car and it never runs reliable, this year only, i nearly threw 1k out of the window for fixing that Car and it still doesnt Run.
    😒

  19. #44
    Join Date
    Aug 2017
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    Wayne,PA
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    740iL (E38 '01)
    1K EUR is nothing in a year on this car, I used to spend that on it monthly

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