Overheated to 250, died on side of highway, left stranded

[seningen]

Bad Water Pump? or idler pulley

There is a way with the Duramatic to engage the fans -- so you should be able to check that.

Hopefully the no start is that the pulley on the water pump or along the serpentine belt has seized
and its not letting the starter turn over the engine.

Also means that the Alternator is not charging.

should be obvious to eliminate by pulling the front engine panel which is behind the seats.
~10 x 10mm nuts/bolts I believe.

mike