In a message dated 3/8/04 6:25:47 AM, dhaynes@OPTONLINE.NET writes: << The main expansion tank is not large enough to allow for this without becoming air bound when cold and overflowing when hot so the second tank is needed.>> If this were the reason, VW would have simply designed a larger pressure tank instead of going to the extra expense and complexity of using two water bottles. <<Another advantage is that without air in the pressurized system, the coolant is less likely to carry entrained air/O2 which avoids cavitation, internal pitting and corrosion. >> As is demonstrated by the billions of cars running around with air bubbles at the top of their pressure tanks, this is no reason for the design either. Cavitation as a result of air ingestion is never a problem on a properly functioning coolant system. The Vanagon's cooling system is what it is because of the geometry of the vehicle with which the engineers had to work. George |
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