2004 X3 3.0 Radiator Fluid & Transmission Leak Questions [Update] - Bimmerfest - BMW Forums

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Old 12-04-2012, 10:14 AM
awdrev awdrev is offline
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Location: Maryland
Join Date: Dec 2012
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Mein Auto: 2004 BMW X3 3.0 Auto Tran
2004 X3 3.0 Radiator Fluid & Transmission Leak Questions [Update]

Hello all,

I recently purchased a 2004 BMW X3 3.0 with 98k miles and an auto transmission.

I have searched tremendously before posting my question as I hate to be one of those users that posts before reading so I wanted to confirm and then ask some questions about pricing.

The car BTW does not seem to have a lot of the maintenance done, not from what I can tell from the Carfax anyways.

I am pretty sure that my coolant expansion tank needs replacement.
1) Is Turner Motorsport what most of you would recommend to get the replacement part from? I could not find a specific DIY to replace this part, is there an old one someone with pictures that could link?

2) I have heard that replacing the thermostat is also wise, is that recommended? Car heats fine as far as I know.

Now to a more serious question: when I topped off my coolant earlier (due to the leak) I noticed small brown spots... in my experience, that's usually transmission fluid leaking onto the radiator system.. but upon further inspection it seems that the oil heat exchange is actually located outside the radiator unit...

1) I am not sure how to proceed now, I mean, I can replace the coolant expansion tank but what in the world can I do about the tranmission leak? Is there a way to confirm it...

2) Is this a common occurrence or is this something else?

Thank you, I look forward to contribute to this community.


Last edited by awdrev; 12-06-2012 at 02:40 PM.
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