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Classic Bimmers
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Old 02-01-2011, 02:43 PM
RVongles RVongles is offline
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Location: Tampa, Fl
Join Date: Feb 2011
Posts: 1
Mein Auto: 1986 525i
Cooling System - 1986 535i

I am looking for some help or suggestions on how to fix my newest coolant issue. I've replaced all the hoses that i can see, flushed the system on a few separate occasions, even had to fix the nipple on the radiator and the cool tank. Prior to this batch of fixes the car was sitting in the garage for about a year.

I'm the second owner of this car and the first owner was a bmw mechanic for 20+ years. Needless to say some things dont exactly conform to any Haynes, Chiltons or any other form of manual. The engine is from an M5, the electrical system, drive train, front end are all also "home made". I don't consider myself an expert when it comes to autos but I'm great at following directions to fix something i just cant find any solutions to my issue.

After my initial repairs, the car ran fine without any incident for 3 days. In the three days i made 4 trips down the highway at about 20 miles each way. I also did some in town driving, again with no incident. The latest incident occurred when arriving at my job which is why i make the 20 mile highway drive.

In this photo you can see a basic overview of the area where i think the issue is located. (evidence by the radiator fluid everywhere)

When replacing one of the old damaged hoses, the nipple that held the hose to the radiator (plastic) snapped off. I "repaired" this by drilling out the area and inserting a metal nipple and sealing the outside with high-temp RTV sealant.

Bellow are a few more pictures i thought may or may not be helpful:

I use this car as my main transportation. Any help would be greatly appreciated.
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Old 02-19-2011, 01:05 PM
John in VA John in VA is offline
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Location: Leesburg, VA
Join Date: Feb 2006
Posts: 321
Mein Auto: '74 tii / E28s / '03 530i
I doesn't look like an M5 engine from those pix. There is a hose from the coolant reservoir that goes to the nipple that was broken on the radiator; the other hose just allows any overflowing coolant to drip onto the ground, and is routed back near the firewall and down into the driver's wheel well, exiting where you can see the metal brake lines.
BMW sells a repair kit for the broken nipple, but you've already "modified" that area - 17 11 9 055 593. Others have used JB Weld to repair any cracks.
The coolant on top of the reservoir can be due to a leaky coolant level sensor or a faulty radiator cap.
I'm just seeing your message today - get over to http://www.mye28.com/ for realtime help!
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