Hey Eric,

     Did some research on the coolant filter idea some while back.  Apparently, NAPA stocks a remote filter mount for coolant filtering.  The thing is, the filter can't be in the path of high flow rate so a secondary loop needs to be added that won't interfere with cooling capacity.  I guess these filters are used on fleet vehicles fairly often.

Scott De Santi
Anchorage, Alaska
1986 Vanagon 2WD (Wobbly Bus)