Bimmerfest - BMW Forums - View Single Post - Got the 1.2 bar expansion tank cap from German Auto Solutions
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Old 03-25-2013, 06:51 PM
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gary@germanautosolutions gary@germanautosolutions is offline
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Location: Grand Rapids, Michigan
Join Date: Jul 2010
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Mein Auto: E39 528i, E60 M5
So, I ask: Does the GAS 1.2 bar cap (or the original 2-bar cap) have such a check valve?
Yes, The G.A.S. 1.2 bar cap uses all brand new BMW internal components that have been recalibrate to vent at 1.2 bar, and the OEM cap has a negative pressure check valve that opens during cool down if the cooling system pressure drops below atmospheric.


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