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7 Series - E38 (1995 - 2001)

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  #1  
Old 01-04-2010, 11:57 PM
Mr Rumblur Mr Rumblur is offline
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Location: Wichita, KS
 
Join Date: Oct 2009
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Mein Auto: 2000 740 iL Dinan 7
E38 coolant leak

Coolant level was down on our 2000 740iL. I noticed some coolant crust on the upper radiator hose 'elbow' connector that I'm pointing to in pic. I decided to keep an eye on it and filled (possibly overfilled) the system. A couple of days later the hose blew off the T-connector (also in pic). Is the apparent seamless clamp reusable or do I just replace it with a standard hose clamp? Also, to address the leak, how does the connector remove from the aluminum neck? I removed the electrical connector type retainer wire. The connector wiggles but seems to be retained by a plastic stem similar to a rivet. Is replacing this leaking 'elbow' connector my only option? Thanks in advance!
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Last edited by Mr Rumblur; 01-05-2010 at 03:02 AM.
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  #2  
Old 01-05-2010, 07:57 PM
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M.Wong M.Wong is offline
E38 E91 (R56 E30 E39)
Location: Seattle WA
 
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Best to just replace the entire hose.

Once you remove the clamp wire, the hose slides off. Try not to wiggle it too hard, you don't want to strain the radiator neck.
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  #3  
Old 01-06-2010, 12:23 PM
Mr Rumblur Mr Rumblur is offline
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Thanks!

Thanks much for this and the tip for bleeding procedure
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  #4  
Old 01-08-2010, 07:06 PM
AwesomeIsLuke AwesomeIsLuke is offline
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Location: New Jersey
 
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Mein Auto: '97 740iL
Quote:
Originally Posted by M.Wong View Post
Best to just replace the entire hose.

Once you remove the clamp wire, the hose slides off. Try not to wiggle it too hard, you don't want to strain the radiator neck.
Yes, be very careful about the radiator neck, especially when retightening that clamp! I tightened mine a bit too much when I replaced the hose and cracked the neck. I needed to buy a new radiator.
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  #5  
Old 05-27-2010, 08:22 AM
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PETER NEWMAN PETER NEWMAN is offline
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Location: RAINHAM KENT UK
 
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Mein Auto: BMW 635 CSi BMW 730i E38
BMW's all models, over heating and coolant loss

This applies to all BMW's
Over heating and coolant and expasion tanks blowing out are caused by viscause fan couplings failing and head gasket failure. In my forty years of working on BMW's I find CONSTANTLY that the cylinder head stretch bolts loosen off which causes the head gasket s to fail. I have seen this on cars less than two years old with around 15'000 miles.
Some six cylinder engines 1992 till 1996 ish had plastic water pump impellers which failed which also causes over heating problems but a skilled BMW technician will spot this by an erratic temp gauge.
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  #6  
Old 05-27-2010, 06:52 PM
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CodyItaliano CodyItaliano is offline
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Location: Corpus Christi, TX
 
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Mein Auto: 2001 740i
i had almost the same thing happen around the same time of year too. i replaced both upper and lower hoses along with the temperature sensor that is located in the lower hose. was about $90 for parts.
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  #7  
Old 05-28-2010, 06:03 AM
OJ's DNA OJ's DNA is offline
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Location: Temecula, CA
 
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Mein Auto: 2001 740iL Sport
Could someone post the proper bleed procedure if available? I'm new to my 2001 740iL and the first thing I replaced were the two hoses and thermostat - the expansion tank was leaky and cracked and had a broken bobber inside. But now I see the coolant level go down in about 7-10 days and starting to wonder? Anyway knowing the proper way to bleed the air would be helpful - thanks.
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  #8  
Old 05-28-2010, 08:19 AM
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PETER NEWMAN PETER NEWMAN is offline
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Location: RAINHAM KENT UK
 
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Mein Auto: BMW 635 CSi BMW 730i E38
Hi there, You will see a bleed screw facing upwards in the radiator area, It is best to do this with a cold engine, Undo the screw and top up the header tank until coolant air bubbles stop coming out of the bleed screw hole, refit the screw and top up the header tank until the bobble is level with the top of the header tank screw thread. Run the engine until hot and then let it cool right down and re check the level wich should be as before. Again I will say that over heating and coolant loss, Fractured header tanks and blown out radiators is due to fan coupling failure and loose cylinder head boltsleading to gasket failure.
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