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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 11-02-2004, 11:24 AM   #1 (permalink)
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I've recently bought a 1990 E34 and every now and then the coolant fluid starts to spill out through the cap...the first time this happened I though it was just that I left the cap lossened, but it keeps happening over and over again. Why does this happen? can somebody help me out?

thanks..
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Old 11-02-2004, 04:33 PM   #2 (permalink)
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BAD CAP may be?
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Old 11-02-2004, 04:45 PM   #3 (permalink)
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maybe you have too much coolant in there.... when the coolants/hoses are cold to touch your coolant level (in the expansion tank under cap) is suposed to be up to KALT (cold)...
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when coolant heats up it expands and the cap is made so it opens up a bit to release excess amounts (if you have too much in there to begin with)
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Old 11-02-2004, 04:52 PM   #4 (permalink)
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JOHNBMW:but it keeps happening over and over again

As such how much excess coolant the car has?
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Old 11-03-2004, 07:47 PM   #5 (permalink)
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what kind of e-34 (m20.m30-m50 w/o vanos). is the car overheating, coolant look brown, like stop leak?? start the car cold w/ the cap off, & rev it up, does the coolant circulate in the tank, got heat..come on man give me some help.
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Old 11-04-2004, 12:53 AM   #6 (permalink)
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Maybe you should get a new cap, doesn't cost much.
I had a 95 E34 which had a recall on the radiator cap.
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