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Old 08-04-2013, 01:03 PM
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gary@germanautosolutions gary@germanautosolutions is offline
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Location: Grand Rapids, Michigan
 
Join Date: Jul 2010
Posts: 288
Mein Auto: 528-530 Hybrid, Duc. 748
Quote:
I thought that as the coolant was heated, it "expanded" and moved from cooling system (radiator) to the expansion tank. After the car is stopped (cools), coolant is drawn back into the radiator.
This is how almost all US manufactured cars work, and I think it is the simplest and therefor best way to do things. In this method the expansion tank is not pressuerized and has an extremely low failure rate. In most European cars the expansion tank runs at full system pressure and actually has constant coolant flow through it. That is why there is such a high failure rate in this type of system. The problem is compounded by BMW's choice of a 2.0 bar venting pressure for these cars.

Gary
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