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  #31  
Old 03-12-2019, 11:01 AM
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Every expansion tank will fail. Over filling is the number one cause of premature failure. The cooling systems in the E53/E39 etc uses the expansion tank as part of the water flow as opposed to other systems where it is only used to bleed off excessive pressure and then return the volume on cool downs. In the BMW engineering it is used to hold X amount with the expansion capacity built in, hence the failures due to over filling.

Pressure test your cooling system, replace the expansion tank if there are ANY leaks, replace your cap. Double check the vent tube and hose that runs on top from the filler neck, and always fill only to get the dip to come up to the neck opening. DO NOT fill up the expansion tank all the way with fluid.
Lots of articles on this process posted all over the DIY Articles and elsewhere as it is a common issue.
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  #32  
Old 03-12-2019, 05:34 PM
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X HP/TQ increase = $1.00 X 100X
 
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Was the work done on the cooling system because there was a leak and it has not been fixed or did the leaking start after the work was done?
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  #33  
Old 03-13-2019, 01:17 AM
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Not sure on that last question but Found the leak. Yep, expansion tank at the back under the seam. Was hard to see. So, new one needed and cap. I understand there is a way to bleed out air pockets with the cap off. Anyone know the process? Also, need to get some coolent in the water sooner rather than later.
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  #34  
Old 03-13-2019, 04:14 PM
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Shouldn't have to do anything more than fill tank to proper level, start the engine, turn on heater and fan, let it run until it gets to operating temp and then slightly open the bleed screw, leave open until fluid rather than air out. Let it cool down and then refill expansion tank to proper level. System should be bled. However, I usually go through the process a second time after I have driven for 50 miles or so.
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  #35  
Old 03-14-2019, 06:03 AM
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Great, thanks for your comment.
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