At this point, I would say there are no strong correlations. Unless
my Indy can figure something out, I think I need to do a coolant has
test or oil analysis to rule out head leak.
Flushing block also should be done but the coolant and visible
coolant passages are squeaky clean.
If there are pieces of metal or iron/calcium crud in there big enough
to block flow, you are not going to see them unless you take off the
WP housing and the freeze plugs.
When it over heats, have you or Curt shot radiator areas, hoses,
block areas etc with IR thermometer to determine hot and cold spots?
That will tell you where to look for a blockage.
Did you ever try running it with the thermometer blocked open per J.
Cathey's instruction? You don't have to have a .45 shell, you can
use a piece of 3/8 OD copper tube gut to the right length and slit
lengthwise.
The IR Thermometer and the blocked open thermostat are the
fast/inexpensive ways to determine where to look and to isolate the
problem.
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