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  #1  
Old 11-26-2013, 12:10 PM
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Quote:
Originally Posted by BimmerM3inGA View Post
Could it be remains of a dust cap from one on the serpentine belt pulleys? Can you see if any of them are missing?
The belt pulley dust caps aren't flat like that. Almost looks like some kind of silicone sealer around the circumference of that plastic as well.
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Old 11-26-2013, 12:18 PM
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could this be where it fell from? looks like some of the same material (silicone?) and the same basic size/shape. and.......what is this area/part called?
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Old 11-26-2013, 12:26 PM
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Originally Posted by x5homework View Post
could this be where it fell from? looks like some of the same material (silicone?) and the same basic size/shape. and.......what is this area/part called?
That appears to be the fan shroud. Wracking my brain for what that circular feature is though... I've had my shroud off for a couple years, and I don't remember any such feature on mine.
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2018 G02 30i
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  #4  
Old 11-26-2013, 12:27 PM
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The dust cap guess was definitely a long shot. I just can't think of anything else in the general area that is round, plastic, and about that size. It looks like it either has a bunch of black sealant goop around the edge, or melted plastic - hard to tell from the photos.

What angle was this last photo taken from? Is it looking up from underneath?
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  #5  
Old 11-26-2013, 12:28 PM
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yep last photo was from underneath.
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Old 11-26-2013, 12:29 PM
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I had my fan shroud out last week, and it doesn't have a round feature like that. The photo is taken at an odd angle and it's a little disorienting!
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Old 11-26-2013, 12:36 PM
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seems strange for a circular piece of plastic to be silicone'd to a bmw .......just get some silicone and slap it back up there? no way?! i just can't tell if this is a serious problem or??? maybe i'll pour some more distilled water into coolant tank and see if it comes out of semi triangular component.
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Old 11-26-2013, 12:45 PM
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I've been studying that photo and I can't figure out how you took it! It looks like you're looking up from underneath with your feet sticking out the front at an angle. But the radiator should be visible from that angle. The white area in the upper left corner is the sky, and I can see the fan and fan clutch but it just doesn't look "right".
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Old 11-26-2013, 12:51 PM
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What semi triangular component? Coolant leaks can be exasperating to track down. I'm chasing one in my X5 at this very moment.

When you took it to the dealer, did they specifically say the lower coolant hose was leaking? How many miles are on this car? If it's anywhere near 100K, it would be wise to replace ALL the cooling system parts (radiator, water pump, thermostat, hoses, pulleys, belts, expansion tank, and transmission thermostat (if it's an automatic)). As mentioned earlier, you DO NOT want to let the M54 engine overheat. I can speak from personal experience about the havoc that will cause.
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Old 11-26-2013, 12:57 PM
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from the front with feet sticking out at an angle is right. no sky in the shot. you recognize more than i do what we are seeing. i am just learning as we go. it looks like the leak was coming from this spot as well, since surfaces below the circular opening look wet and less dusty. above opening has residues. thanks for the input; i appreciate the feedback.
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