In a message dated 11/17/03 9:52:35 PM, dabomb@TANJABARNES.COM writes:

<< He pressure tested my rad cap, found that it wasn't holding any
pressure. >>

Bomb, my man, in my experience, the most obvious cause of the coolant
overflow tank filling up after a hard run is that the pressure cap is not working
properly because some minor amount of debris is preventing one of the valves in
the pressure cap from fully seating.  Your original cap tested faulty so it is
possible that you have some manner of crud circulating in your coolant system
and this crud has once again caused the pressure cap to shit the bed.  My
advice would be to first test the replacement cap.  The newer style caps, the ones
which I have seen are blue, seem more prone to this problem because of the
construction of their valving.  It is also possible to visually check for dirt
on the valve seats if you know how to remove the pressure cap innards without
destroying the cap.  Then it is simply a matter of carefully cleaning the
pressure cap components and, of course, the entire cooling system.

George