In a message dated 2/4/05 1:58:23 AM, docproteus@EARTHLINK.NET writes:

<< I know that the coolant is a low pressure system, but since it1s a closed
system shouldn1t it have to run its course? >>

Only if the system is filled and vented properly, i.e., completely.  There
must be an air pocket somewhere in the system.  This is the reason why I have
installed a vent at the highest point of the coolant system on my van and why I
fill the system from a temporary reservoir hung at the roofline.

George