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Old 11-06-2012, 10:31 PM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
Posts: 3,891
Mein Auto: 2004 X3 2.5i
Originally Posted by hyksos View Post
The fan was not working at all, but the X3 does not overheat easily, even with the fan not working at all, the engine was keeping normal temperature 99% of the time, I only saw overheat when I was stuck in traffic for long time.
Don't be misled by the BMW temp. gauge.

It is damped more than the average so that owners don't complain to dealerships about small fluctuations in operating temp.

You will notice when warming up that the temp. gauge moves to the middle and stays there.
In fact, the the full operating temp. is not achieved until several miles or minutes after that.
But the temp. gauge doesn't show you that.

Similarly, if you have a coolant leak, or your cooling fan stops working, the temp. gauge will not alert you to that right away.

Quite a few owners have commented how the gauge can quite rapidly go from the center to the red.

So I think you were overheating when the fan failed and power loss certainly follows.

The power loss could come and go as the natural air flow to the engine changed with speed.

Or maybe your fan was in fact failing intermittently before completely dying.

You maybe dodged a bullet there and caught it just in time.
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