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Old 08-10-2019, 02:30 PM
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New Coolant Expansion Tank but Need Help Identifying Other Parts



So I replaced my ruptured Coolant Expansion Tank and Automatic Transmission Thermostat with the great help of this forum. But while I was removing the intake filter, these parts fell down by the fan. For the life of me, I cannot figure out where they came from.

The black tube is very brittle and breaks easily. I donít even know if both parts are related, although Iím sure they are. Anyone have any ideas?

Thanks in advance!


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Old 08-10-2019, 02:34 PM
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Just realized I didnít include this:
This is a 2001 BMW X5 3.0 Automatic.
Itís my first BMW. And, my first post about it!


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Old 08-10-2019, 03:13 PM
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I could be wrong but the black tubular item looks like the spark plug socket. Check this website for more details https://www.realoem.com/bmw/enUS/sho...diagId=12_1051
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Old 08-10-2019, 03:23 PM
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Judging from the pattern on the wipe behind the objects, these are way smaller than a spark plug socket. They are tiny... Maybe like 25mm (1") long each...

That right, daveinrome?
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Old 08-10-2019, 03:46 PM
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Ok. Here is another photo. I didnít realize that the tube was completely split and only was held together by the ring of plastic. It almost like it was an overflow tube of some sort. Maybe an oil vent tube that I accidentally broke? Maybe something that the PO had repaired? It may have even blown out of the inside of the Expansion Tank and just fell down when I started moving things around for the replacement.

The diameter of the tube was 3/8Ē to 1/2Ē.

I have no idea about the white part, though.


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Old 08-10-2019, 03:47 PM
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White part looks a little like the holder for the radiator.


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Old 08-10-2019, 05:12 PM
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Especially since you mentioned your tank ruptured, those parts look very similar (although different) to the float and float guide shown clearly in this great thread:
https://xoutpost.com/983445-post3.html

Could be that the difference between your photos and those in that thread are due to OE vs. aftermarket.

Does the white thing float? Is that dark ring at one end magnetic?

If this theory is correct, you don't need to worry about anything - the replacements for those parts are already in the expansion tank you bought.
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Old 08-10-2019, 05:16 PM
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The white part certainly could be a holder for the radiator. I had to pull on the hoses to work them loose, although I tried to be as careful as possible.

Do the radiator holders go on the bottom, top, or sides?

Iíll take a look tomorrow around the radiator to see if I can see other similar holders that should still be in place. Iíll use that information to guide me with finding a place for this one and Iíll post back here with what I find.


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Old 08-10-2019, 11:09 PM
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Radiator holders on the side most likely just in front of the coolant reservoir. (Not really expansion tank it's a closed system not a suck and blow system like domestic cars). If the old tank blew up that black tube looks like where the magnetic level sensor goes and the white part as suggested above looks like the float that goes over it.


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Old 08-10-2019, 11:12 PM
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Agreed, looks like part of the float and float stop, that little collar that was around the tube, and the float guide with the magnet at the far end. I would venture to say that you are safe to replace the expansion tank and probably be good to go.
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