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7 Series DIY
Do It Yourself forum dedicated for 7 Series BMW Owners

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  #1  
Old 02-28-2015, 10:21 AM
riff riff is online now
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Location: Portsmouth, NH
 
Join Date: Oct 2009
Posts: 78
Mein Auto: 745i, 330Xi
Coolant leak on both sides of air intake manifold

Hi,

I have a 2002 745i - the only car in the world that combines power, grace, elegance, and beauty - that is approaching 100,000 and as such it's due for some maintenance. While I was perusing the engine bay I noticed coolant on either side of the forward part of the intake manifold - hidden down low in a little cubby hole. I have noticed some minor loss of coolant over the past few months so these two little puddles of coolant are somewhat concerning as they may be symptomatic of a larger issue.

The water pump feels and sounds ok and the coolant transfer pipe weep hole doesn't appear to be leaking - plus they are lower in the engine bay making it hard for it to "leak up" into these two spots (see pictures).

I appreciate any thoughts on what may be causing this. I was getting ready to do the big job of replacing coolant pipe, water pump, thermostat, and a few other items (updated valve cover , gaskets, etc.) but I am hesitant to start until I have a better idea as to what may be causing this.

Thanks for your thoughts - pictures enclosed
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  #2  
Old 03-18-2015, 06:54 AM
tony745li tony745li is offline
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Location: Wisconsin
 
Join Date: Oct 2014
Posts: 57
Mein Auto: 2003 bmw 745li
have you changed the coolent pipe yet ?
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  #3  
Old 03-18-2015, 07:02 AM
riff riff is online now
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Location: Portsmouth, NH
 
Join Date: Oct 2009
Posts: 78
Mein Auto: 745i, 330Xi
Hi Tony

No, got side tracked here plus we are back to winter again - it's going down to 8 freaking degrees today. Unbelievable.

I went to the indy to ask them what they thought of the leak. They figured it out to be the coolant pipe from the reservoir that was leaking at the heads.

I specifically took today off to get started - doing a coolant flush/drain first as the last guy put regular coolant in and then it is on to the Secondary Air/Intake Manifold removal/Coolant Pipe/Valve Cover gasket/etc massive project. Unfortunately the garage isn't quite at 30 degrees right now. Hoping for 40 degrees on Saturday.
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Old 03-21-2015, 11:24 AM
riff riff is online now
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Location: Portsmouth, NH
 
Join Date: Oct 2009
Posts: 78
Mein Auto: 745i, 330Xi
I am deep on using secondary air tool from aga. I am at the point where I am using the drill to run the brush through the galley. I've been sitting here for 15 minutes and the brush has not moved at all it just keeps spinning the same spot. I'd welcome any thoughts on what I might be doing wrong.

Last edited by riff; 03-24-2015 at 01:24 PM.
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coolant issues, coolant leak, intake manifold, water pump


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