540 - Water Leak - Radiator? Exp Tank? Water Pump?

[windarra]

Hi folks, I have a 97' 540 E39 with 130k miles. I noticed today I have green water coming from under the middle of the engine area. The radiator and expansion tank were replaced at 120k and was done by the previous owner (I have invoices). Could this mean, my Water pump is out?

Any suggestions on what this problem is and how much it will cost me to fix it? Thanks.

[LOS]

It's really hard to tell. The only way to know for sure is to locate the leak. It could be a hose as well. Click on the link below. It shows the whole cooling system diagram.
http://realoem.com/bmw/partgrp.do?mo...88&hg=11&fg=35

They sell a green/bright stuff that you mix with the coolant and run the car. That's how they spotted & confirmed the leak coming from the water pump on my Fiero GT a few years back at the Pontiac Dealer.

LOS

[cnn]

Originally Posted by windarra

Hi folks, I have a 97' 540 E39 with 130k miles. I noticed today I have green water coming from under the middle of the engine area. The radiator and expansion tank were replaced at 120k and was done by the previous owner (I have invoices). Could this mean, my Water pump is out?

Any suggestions on what this problem is and how much it will cost me to fix it? Thanks.

Yours is 540i so a bit different but the idea is the same.

Here it is:
http://bimmerboard.com/forums/posts/199986

HTH.

cnn
98 528i 5spd 89K