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Old 03-09-2021, 03:47 PM
andrewwynn's Avatar
Join Date: Jun 2015
Location: Racine, WI
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Originally Posted by Fifty150hs View Post
+1 on this. Used UV dye to find a leak that I was chasing for a month. It was the temp sensor o ring on the right side of the radiator. Leaked from there, hit the splash shield then ran out wherever it was easiest. Not where the actual leak was.

Mainly just like that but it was a large leak and made a big puddle in about an hour. I made a “temporary“ fix using Teflon tape in January 2018. I bought a pack O-rings to fix it proper and never had to use it. You can do fix without draining any coolant if you do it fast enough. I lost navy one cup of coolant
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
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Old 03-09-2021, 03:49 PM
Join Date: Feb 2013
Location: nyc
Posts: 1,825
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How good is your fluid system.
Mine has always disappeared coolant here and there...
All hoses relaced. Valley Pan. The cover plate by the bellhousing....
She still tends to disappear some coolant now and then. Just topped off 12oz while I have the hood open the other day
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Old 03-09-2021, 08:59 PM
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Location: Little Elm,Texas. (40 minutes North of Dallas)
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I don't recall ever having to do more than safely jack it up and start from the bottom with a bright narrow flashlight beam and trace the coolant leak up to the source. A leak showing on drivers side could be a coolant hose.

After you shut off the engine from operating temp the coolant temp increases as does the pressure. That likely why you are not seeing a leak all the time.

Most auto parts stores will rent a pressure tester and return the amount of the rental fee when the tester is returned.
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
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Old 03-10-2021, 12:01 PM
Join Date: Sep 2019
Location: Cyprus
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I have recently had to source a non obvious coolant leak on my facelift 3.0d. It turned out to be a tiny crack in the plastic return pipe on the neck of the second bleed screw. so it would only leak under pressure. I have sourced a replacement pipe but I managed to stop the leak by using a hose clamp on the neck of the bleed screw which seems to be doing the job until I can get time to change the pipe
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Old 07-02-2021, 11:19 AM
Join Date: Feb 2019
Location: Chicago
Posts: 19
Sae85409 is on a distinguished road
Found my leak. I caught it in the act. Coming from bottom of the expansion tank and the expansion tank connector (17111438820).

Doubt it is O ring on the expansion tank because less than 2 years old. Will have to take apart to see if expansion tank connector is cracked.
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