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General E46 Forum
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Old 10-09-2014, 03:02 PM   #1
Delineation
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Need confirmation on Cooling System part

I thought it was a leak from my Return Hose, but upon further investigation I believe the Coolant is leaking from Water Connection Pipe (PN# 17111707817) from the Expansion Tank, and/or the O-ring (PN#17111711987). -Any tips, and has my trouble shooting been correct? I've attached an image for you to see what I've got here. I've already got a 1 Ltr container of BMW Coolant to top it off when needed until I receive the correct part.
Thanks!

P.S. I know where all the other dry coolant in the image came from. I spilled a bit a little while ago. I'm assuming the dried coolant on the Return Hose is from the leak mentioned above. The wet spot is the one in question.
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Old 10-09-2014, 03:05 PM   #2
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Looks like the o-rings on the expansion tank could be tweaked, yeah. but you've got stains from higher points as well. No investigation is needed though. If it's old or original, replace it.
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Old 10-09-2014, 03:08 PM   #3
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Thanks for the immediate response Mr. Mango!
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Old 10-09-2014, 03:26 PM   #4
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Just replace all 4 of those hoses. They are really cheap if your go CRP (Contitech) BMA parts has for them for $17.00 a piece. I just replaced those and all of the hard lines on the block this weekend.


Joe
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Old 10-09-2014, 05:19 PM   #5
Delineation
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Quote:
Originally Posted by SeattleLSB View Post
Just replace all 4 of those hoses. They are really cheap if your go CRP (Contitech) BMA parts has for them for $17.00 a piece. I just replaced those and all of the hard lines on the block this weekend.


Joe
Thanks. I like to go BMW when I can, or OEM. I usually use ECS because of how close I am. I get my order on Wednesday when I place it on Sundays. I've never ordered from BMA before so I'm not sure how long UPS ground will take to get to me. I used to have to wait a while when I used AutohausAZ. I suppose what I don't save on price point, I more than make up with on time. $17 isn't bad at all!
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Old 10-18-2014, 02:49 PM   #6
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So I'm about to dig in to this scenario, most likely on Wednesday, but I'm having a hard time figuring out what's what based on the realoem diagram.

http://www.realoem.com/bmw/showparts...=17&fg=05&hl=5
I went to BMW yesterday, and scooped up an O-ring. (PN#17111711987), but It doesn't look like it goes where my leak is coming from according to the diagram. Do I need to order the Coolant connection fitting as well (PN#17111707817)?
It would seem that's where the leak is dripping from. It's difficult to get a better image to show you guys because I keep getting dripped on. The leak is not coming from the hose at the bottom of the image, which I believe to be the return hose. (PN#11531436410)http://www.realoem.com/bmw/showparts...15&hg=17&fg=30 I'm also not even sure how difficult this will be. The only work I've done to the coolant system, as far as plumbing goes, is the thermostat.
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Old 10-19-2014, 08:25 PM   #7
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Well, Parts won't ship until the day before I leave town. So I'll have to update the progress after the 27th. What a bummer. I hope that my ride isn't empty on the coolant by the time I return. It's slowly getting worse. I figure I should put a bit more than I know I should since it's only going to drip out. (maybe even just add some distilled H2o.) I'll be gone for 3+ days. Also considering putting a catch pan underneath, but I don't want any neighborhood animals getting sick on my account. I ordered more BMW coolant, and a BMW ET thermostat in case the one in the ET decides it want to break upon ET removal. (I'm assuming I'll have to remove the ET to get to the O-ring I need to replace.)
Till then, folks.
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Old 10-30-2014, 12:39 PM   #8
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Wednesday I got around to removing my ET, and having a look at the leak in question. The O-ring I had got, was nowhere near anything that I needed even after using realoem. In fact, there was no O-ring at all. I inspected the opening of the ET where the Coolant Connection Fitting inserts (which is where I believe the leak to be coming from), and detected no fractures, or cracks of any kind. I also examined the Coolant Connection Fitting, and also found nothing out of sorts. I also replaced the ET Thermostat. I think that because my Radiator Support is slightly bent, that at some point the ET was jarred a bit, and the leak occurred at that point. After putting all of it back together, and having filled, and bled the system, I did not see the leak return from the area in the above image which was a steady drip. I waited several minutes, and ran the engine as well. No leak. If I see any fluid under the car when I leave work today, I will know if I've fixed the issue.
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