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17 11 Radiator and Mounting Parts E65 / E70 / N62 / N62TU / N52 / N52K

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.
TECHNICAL DATA - RADIATOR AND MOUNTING PARTS

Cap for cooling system    
Pressure relief valve opens at overpressure to ambient pressure bar 2 +0.1-0.2
Vacuum valve must open at latest at partial vacuum to ambient pressure bar 0.1
Test pressure, radiator (gauge pressure) bar 2.0