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Russian Bimmer
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Discussion Starter #1
hey guys ,
couple of days ago , i was parking home and i found that the temp. of the car on the dashboard went too high till the red zone, i switched the car immediately off and opened the hood and found lots of vapor and the water kept going out from the cap, i changed the thermostat since the car already took too long to be warm and the heating inside the car started to be up-normal .

after that temperature started to be normal but i found a leaking in the end of that bottle which is connected to the radiator itself ,i went to the service center , they said i need to buy a new radiator , but as i noticed that the water only comes out from the meeting point between the bright bottle (Expansion tank) and the black part , i don't know the names since my old car just had a one piece old radiator ( Chevrolet)

as i noticed when buying a radiator , when i searched on the internet with the word ( radiator ) , the results are everything except this bottle which the leaking is from
so should i buy only that bottle or what ?

because when i asked them , does this part( i mean the bottle) is separated, they said no


thanks in advance
 

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You might want to list your year of 520i and country in your profile so people can give you the correct advice on parts without reading through your other posts.

I had to look back at your 12 other posts to find your VIN. The radiator 17111740699 and expansion tanks 17111712835 are sold separately and would change the tank first before the more expensive radiator. BUT, since all parts are plastic, if one fails, many here will say spend the money on a cooling system overhaul since the rest may start leaking soon too

This is the parts I can find based on your VIN bn63605
http://www.realoem.com/bmw/enUS/showparts?id=DD11-EUR-05-1998-E39-BMW-520i&diagId=17_0099

I'm not sure you are in the USA but it is less than $20 here:
https://www.rmeuropean.com/Make/PartNumberSearch.aspx?pnsearch=17111712835

Now that you've updated your profile with Russia, I have no idea how easy it is to find the parts there. Good luck.
 

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Russian Bimmer
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290 Posts
Discussion Starter #3 (Edited)
You might want to list your year of 520i and country in your profile so people can give you the correct advice on parts without reading through your other posts.

I had to look back at your 12 other posts to find your VIN. The radiator 17111740699 and expansion tanks 17111712835 are sold separately and would change the tank first before the more expensive radiator. BUT, since all parts are plastic, if one fails, many here will say spend the money on a cooling system overhaul since the rest may start leaking soon too

This is the parts I can find based on your VIN bn63605
http://www.realoem.com/bmw/enUS/showparts?id=DD11-EUR-05-1998-E39-BMW-520i&diagId=17_0099

I'm not sure you are in the USA but it is less than $20 here:
https://www.rmeuropean.com/Make/PartNumberSearch.aspx?pnsearch=17111712835

Now that you've updated your profile with Russia, I have no idea how easy it is to find the parts there. Good luck.
thanks alot for your help,we have a website www.emex.ru and i found this part which goes with my model ( Trucktec 0819147) it's German made , so i will give it a try and hope it works and i don't have to replace the whole radiator since the water only leaks from the side of the Expansion tank
 

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You sure that fits? That picture of the Vaico expansion tank does not look like the one in your first post or the ones in the links to the USA sellers though.
 

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Russian Bimmer
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Discussion Starter #5
You sure that fits? That picture of the Vaico expansion tank does not look like the one in your first post or the ones in the links to the USA sellers though.
i also noticed that but the details were as in the photo below
 

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Russian Bimmer
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Discussion Starter #7
i would double check another supplier with part number 17111712835. Does not look anything like the original one on the car. But if it doesn't fit, hopefully that place offers refunds.

https://www.google.com/search?q=Tru...gAhUIk1kKHTHLDaMQsAR6BAgCEAE&biw=1680&bih=922

https://www.google.com/search?q=171...gAhXSjVkKHdctDnQQsAR6BAgAEAE&biw=1680&bih=922
found this one under the same number

Hans Pries 500789755
https://www.google.com/search?q=Han...wa_gAhXhxqYKHZfSB7YQ_AUIDigB&biw=1366&bih=577
 

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Yes, that looks more like a match. But also notice it is only the white part of the tank, you may have to re-use the top and bottom black part.

If the black part is leaking and if that is attached to the radiator, the tank won't help.

If between the white and black, it might just be the rubber seals. You really need to identify if something is cracked or the rubber is dried out.

If the rubber is dried out, you can just buy the rubber part #3 17111712965 or #4 17111712966

http://www.realoem.com/bmw/enUS/showparts?id=DD11-EUR-05-1998-E39-BMW-520i&diagId=17_0099

https://www.google.com/search?q=172...xa_gAhVruVkKHZFOBFQQ_AUIDigB&biw=1680&bih=922

Basically, if you want to minimize the immediate cost, you need to figure out which part is causing the leak then look to the RealOEM diagram and find if that part is sold separately (#2-14) or part of the whole radiator (#1). Make sense?
 

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Russian Bimmer
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Discussion Starter #9
Yes, that looks more like a match. But also notice it is only the white part of the tank, you may have to re-use the top and bottom black part.

If the black part is leaking and if that is attached to the radiator, the tank won't help.

If between the white and black, it might just be the rubber seals. You really need to identify if something is cracked or the rubber is dried out.

If the rubber is dried out, you can just buy the rubber part #3 17111712965 or #4 17111712966

http://www.realoem.com/bmw/enUS/showparts?id=DD11-EUR-05-1998-E39-BMW-520i&diagId=17_0099

https://www.google.com/search?q=172...xa_gAhVruVkKHZFOBFQQ_AUIDigB&biw=1680&bih=922

Basically, if you want to minimize the immediate cost, you need to figure out which part is causing the leak then look to the RealOEM diagram and find if that part is sold separately (#2-14) or part of the whole radiator (#1). Make sense?
well, i guess i will order the tank + the rubber seals and if the leaking kept running , so it's time to change the radiator too, i guess if the radiator itself has leaking , so i guess the tank also will start to leak
 

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I think the new tank includes the rubber seals. I was suggesting just the rubber seals if the tank itself is not leaking or cracked. And the cheapest solution.
 

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Russian Bimmer
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Discussion Starter #11
another irrelevant question, do you have any idea do i have timing rubber belt or chain ?
 

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Russian Bimmer
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Discussion Starter #13

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Just search for BMW M52 timing
 

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Russian Bimmer
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Discussion Starter #17
i've replaced the radiator and it came with it's own expansion , installed it and the most strange thing happened , the water came out the same place, and even more that the old radiator
 

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Russian Bimmer
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Discussion Starter #18
so an Update:
i bought a new radiator , and the car worked just fine, i've noticed that i have to fill it every day in the morning , but i didn't notice any leaking at all ,so i kept filling it everyday till the strangest thing happened,
one time i found the temp. got very high and after i took the car home and let it rest for the night , the next day i filled the car to see where is the leakage , i found that it's from under the cap, so i bought another one and had to bleed the system since it of course got air in it , but after that, the water doesn't leaking from under the cap, but ONLY when i start the car, a leaking happens from the bottom of the radiator, what is there to check , of course the obvious answer is a leaking in the radiator, but if so, it should be leaking as soon as i fill the radiator which is not the case i have
 

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so an Update:
i bought a new radiator... but ONLY when i start the car, a leaking happens from the bottom of the radiator, what is there to check , of course the obvious answer is a leaking in the radiator, but if so, it should be leaking as soon as i fill the radiator which is not the case i have
When you say new, was it actually new or used? Are you sure it's from the bottom of the radiator or there a water line coming from somewhere higher and then dripping at the bottom?

IF dripping at the same spot as previous radiator, I suspect leak is coming from above somewhere. As likelihood of 2 radiators dripping from the same spot is unlikely.


If new radiator and in fact leaking from radiator body itself, it may already be defective and needs to be exchanged.
 
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