hi bill et al,
good analytical process as usual and that's what brought me to this point. the fan had failed which triggered the investigation. the surprisingly clean system has lead me to look for uncommon problems though i don't mind replacing the radiator or any parts on a 325k engine .... which i'd do at a rebuild anyway. i am swamped with other projects and will need to resume the fix when time is available. anomalous and intermittent problems are the most intriguing.
not a fan of 'the invisible hand' or any evil spirits but always amazed as they predictably show up in most arguments.
the index seems like a terrific idea.