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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 06-01-2010, 11:35 AM   #1 (permalink)
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Massive Coolant leak-2001 540i

Yesterday I was passing someone and got the engine revs way up while doing so. After coming to a stop light I noticed steam and smelled coolant. I went to accelerate and the traction control came on as I drove away! After that everything seemed fine and I went home so I thought maybe coolant went through an overflow of some kind?

The next day I drove it and it steamed again and the temp went to redline, then back down again, then redline, etc. It then stayed at redline and I pulled over. Eventually limped home and about 6 blocks from home I drove it on redline (I know-stupid to do)!

The leak appears to be coming from near the transmission fluid lines, underneath the car towards the drivers side. Any ideas what I am up against here? Thanks for any help you can give.
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Old 06-01-2010, 11:45 AM   #2 (permalink)
OMFG another one!?
 
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That could be a leak associated with the heater core.
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Old 06-01-2010, 11:47 AM   #3 (permalink)
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I was thinking the same thing. There is the hose that runs right through there to the heater core I think?
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Old 06-01-2010, 12:38 PM   #4 (permalink)
OMFG another one!?
 
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Have a look at realoem.com
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Old 06-01-2010, 12:49 PM   #5 (permalink)
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I'll give that site a look. I just hope I didn't fry the engine!
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Old 06-02-2010, 03:19 AM   #6 (permalink)
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I would be looking more at the radiator where the trans line connect to....
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Old 06-02-2010, 09:27 AM   #7 (permalink)
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Radiator

There does appear to be some dried up coolant in that area. But when I popped the hood during the overheat, it did appear that most of the steam was coming from the area of the firewall, in front of the drivers side. But when I looked in there yesterday, I did not see any obvious sign of a problem there at all. Not sure what the heck is going on but at this point I'm bringing it in. If it was something I could see, then fine, I can probably handle it. But I can't find anything that sticks out as being the problem. Sucks!
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