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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 08-31-2014, 03:05 PM
alabama750il alabama750il is offline
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My bulletproof 750il

I recently acquired a 750il that has the factory protection package to resist small arms fire. It runs but coolant goes everywhere. As I find out more I will probably have lots of questions. Click image for larger version

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  #2  
Old 08-31-2014, 05:48 PM
sealbeach740 sealbeach740 is online now
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Protection package or not, the cooling systems are a weak point on E38s/E39s.
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2000 740iS. MKIV, 16x9, DDEs controlled by Euro fog light switch, reversed steptronic +/- pattern, paddle shifters, clear corners, Basslink, iPod video with stereo audio, TV tuner, gauge rings, ///M pedals, backup camera with 'on demand' switch, quad brake lights, Dinan engine & tranny software, windows/sunroof close via remote.

2003 540iS. MKIV, 16x9, PDC, CWP, TV tuner, backup camera with 'on demand' switch, paddle shifters, windows/sunroof close via remote, iPod video & audio.
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  #3  
Old 08-31-2014, 06:27 PM
alabama750il alabama750il is offline
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Does anybody know anything about these secondary water pump/heater control things?


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  #4  
Old 08-31-2014, 06:54 PM
Mayorchuck Mayorchuck is offline
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Heater control valve. What about it? I know on the 740's the hoses that come off of it are often a source of failure.
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  #5  
Old 08-31-2014, 06:59 PM
alabama750il alabama750il is offline
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I heard from the person who had it before that it is likely the cause of the coolant leak. Is this a common failure?


Montgomery, AL
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  #6  
Old 08-31-2014, 07:06 PM
Mayorchuck Mayorchuck is offline
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More likely a split hose. They are know to stick but not to leak. They certainly can but more likely to be a split hose. It's sits on the firewall on drivers side on the 740. Believe it's the same for the 750. Check the small hoses that come off the pump.
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  #7  
Old 08-31-2014, 09:48 PM
JasonSC540ia JasonSC540ia is offline
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This was the condition of my heater valves at 80,000 miles.

http://www.bimmerfest.com/forums/sho...d.php?t=741314
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  #8  
Old 08-31-2014, 09:53 PM
alabama750il alabama750il is offline
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Laying under my car. Got it up to operating temp. Was spewing hot coolant everywhere the whole time from somewhere over here.


Montgomery, AL
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  #9  
Old 08-31-2014, 10:31 PM
alabama750il alabama750il is offline
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ID:	461965 Instrument cluster has some dead pixels and the radio has not shown me an image.


Montgomery, AL
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  #10  
Old 09-01-2014, 05:50 AM
chrisn7 chrisn7 is online now
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The secondary water pump is on the right side of the engine, looking at it, between the suspension turret and engine. The hoses are all clipped on and very unlikely to come off. The valves can corrode to the point where they do not operate, but only if the incorrect coolant is used. If you suspect it, its very easy to remove.

The set up is that there is one hose from the block to the pump, after which it splits into two hoses, one each for the driver and passenger side of the heater matrix, with connections at the centre of the firewall, top of engine. The third hose from there is the return flow to the block.

The system IMHO is more likely to leak from somewhere at the front. On the V12 there is one short hose, from the water pump, that passes behind the drive belt to the expansion tank. The belt runs so close, that BMW had to mould the hose to achieve some clearance. However, it can balloon with time, when the belt rubs a hole in it. You have to remove the black metal air pump tube to see it

Last edited by chrisn7; 09-01-2014 at 06:00 AM.
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  #11  
Old 09-01-2014, 09:44 AM
alabama750il alabama750il is offline
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ID:	462026 I managed to get it out. What is this hole on the bottom of it? It appears to be leaking from here.


Montgomery, AL
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  #12  
Old 09-01-2014, 09:45 AM
alabama750il alabama750il is offline
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Montgomery, AL
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  #13  
Old 09-03-2014, 01:22 PM
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QSilver7 QSilver7 is offline
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Quote:
Originally Posted by alabama750il View Post
Attachment 462027


Montgomery, AL
Don't know what the hole is for...but that is the aux water pump which is connected to the water valves (the other section on top).

You can see in another image below found simply googling "BMW E38 aux water pump"...that the hole looks like it's supposed to be there. Now...is it supposed to leak...or is it a designed drain hole?



If you need to replace...you can purchase the water valve/aux pump together (use item #1 part nbr)...or you can but the aux pump separately (see item #2 in the diagram and part nbr index):

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  #14  
Old 09-20-2014, 12:00 PM
BAD750IL BAD750IL is offline
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I had the dash pixels repaired for $160.00 so everything is real nice & legible, but I still have the same problem with the radio / nav display screen going blank from time to time. Did you find out anything from anyone on that issue?
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