Bimmerfest - BMW Forums - View Single Post - Got the 1.2 bar expansion tank cap from German Auto Solutions
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Old 03-11-2013, 03:38 PM
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gary@germanautosolutions gary@germanautosolutions is offline
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Location: Grand Rapids, Michigan
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Mein Auto: E39 528i, E60 M5
I'm sure most people have gathered this from the ongoing discussion, but it still probably bares mentioning for those how are interested in the finer details; the coolant cap is a differential pressure relief valve. It will vent at 1.2 or 2.0 bar above whatever the ambient absolute atmospheric pressure is at the time. So technically it will vent at a little different absolute pressure even based on weather conditions.

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