First - A HUGE THANKS TO SLOMO, who directed me and had small enough hands to loosen the top nut to the down tube connecting the PHH. He was great, and I can't thank him enough for his time and effort!!!
Without his very patient guidance and help, this wouldn't have happened. Old PHH was in very good shape for 12 years and 165,000 miles.
We drained the old coolant, changed the PHH in a few hours, then did a very thorough flush, then refilled with Yota red and distilled water.
Pic of the new blue PHH!

Without his very patient guidance and help, this wouldn't have happened. Old PHH was in very good shape for 12 years and 165,000 miles.
We drained the old coolant, changed the PHH in a few hours, then did a very thorough flush, then refilled with Yota red and distilled water.
Pic of the new blue PHH!