» Site Navigation | | » Recent Threads | | | ![](http://www.318ti.org/forum/clear.gif) | ![Reply](http://www.318ti.org/forum/images/buttons/reply.gif) | ![Share/Bookmark](http://static.addtoany.com/buttons/share_save_171_16.png) | 05-18-2019, 09:01 AM | #1 | Senior Member Join Date: Jul 2017 Location: Stuttgart, Germany Posts: 118 | M44 strange water leak from rear?? Hi guys, so I have been doing a lot of work on my 318ti last week and I have noticed some loss of coolant just behind the power steering rack. I have some 10 - 20 ml lost a day. Its something that I didn't see till a week ago after doing some work relocating my battery to the trunk with all the wires and stuff I messed around with may have made the leak more prominent and I dont think its the windshield wiper lines either. I think on the M44 the rear coolant connector is known to leak (part number 11531743679).Maybe its the side one (11531709232)? I will replace both and hopefully it ought to solve it. Any ideas? Edit: I did have to tuck around with the heater control valve, wonder if that is leaking? Might band aid with a few turns of the wrench and later doing it right when I do the two hose connectors on the side and rear? Last edited by MisterM52; 05-18-2019 at 10:17 PM. | | | 05-19-2019, 01:38 AM | #2 | Junior Member Join Date: Dec 2011 Location: Lexington, VA, USA Posts: 20 | That y pipe on the back of the head was the downfall of two of my three M44s, I'd replace it immediately. Sent from my SCH-I545 using Tapatalk | | | 05-19-2019, 03:53 AM | #3 | Senior Member Join Date: Jul 2017 Location: Stuttgart, Germany Posts: 118 | Yea, I am getting a replacement one along with the pipe on the side of the engine. when installing I see some folks use Red High Temp RTV around that part, I should too I guess? Any other possible sources? | | | 05-19-2019, 05:18 AM | #4 | Senior Member Join Date: May 2013 Location: Seattle Posts: 513 | I don't use any RTV. A little lube on the rubber gasket so it seats properly and that's that. ..Your heater core valve looks a little suspect there, I don't know how far I'd trust that thing. | | | 07-25-2019, 04:05 PM | #5 | Junior Member Join Date: Jul 2019 Location: ohio Posts: 7 | Quote: Originally Posted by BRADESTAR I don't use any RTV. A little lube on the rubber gasket so it seats properly and that's that. ..Your heater core valve looks a little suspect there, I don't know how far I'd trust that thing. | that's it right there. I found that rtv, is for inexperienced fixes. | | | 05-19-2019, 09:53 AM | #6 | Senior Member Join Date: Jul 2017 Location: Stuttgart, Germany Posts: 118 | remarkably there isnt a leak to be found under today! might still just replace those 2 as preventive measure. that heater core, gonna watch that a bit... | | | 05-20-2019, 09:09 PM | #7 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | Replace those immediately. I dont suggest even driving the car until those are replaced. You can blow those to peices easily and cause an overheat. Then u might even cause head damage. You cant take chances on cooling components with these cars, they arent forgiving at all. Sent from my iPhone using Tapatalk | | | 05-20-2019, 09:46 PM | #8 | Senior Member Join Date: Jul 2017 Location: Stuttgart, Germany Posts: 118 | Yea, I ordered those two hoses, I am not used to the 4 cylinder BMW's, have mostly owed 6 cyl ones and know what goes wrong with them, the 4 cyl seems just as prone, specially with the connections in the back. | | | 05-30-2019, 09:47 AM | #9 | Senior Member Join Date: Jul 2017 Location: Stuttgart, Germany Posts: 118 | I found the source of the small leak, it was the windshield washer reservoir. it was leaking from the little pump fitting, a bit wiggling sorted that out. I think I am losing a little bit coolant though. Must be a leak on those 2 hoses. I received the 2 replacement hoses the other day in the mail. Going to do them some day next week, will do the RTV method though, just as insurance. | | | 06-18-2019, 12:59 PM | #10 | Senior Member Join Date: Jul 2017 Location: Stuttgart, Germany Posts: 118 | A little update, while doing some maintenance I found that my bottom radiator hose was not fully inserted, and when I blew in the radiator and pressurized it with my mouth, it would leak from there. I cleaned it up and inserted it properly that and added a new hose clamp, I also found my top bleeding screw on the radiator was not going in fully as well as the radiator cap was broken. I think those were slowly leaking coolant out. So if anyone in the future have a slow coolant loss, be sure to check these lines too! | | | ![Reply](http://www.318ti.org/forum/images/buttons/reply.gif) | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |