All the symptoms pointed to the serpentine drive once you thought about it....
No power - supercharger not turning
Overheating - water pump driven by the supercharger
No A/C
No alternator output
He also had a leaking thermostat housing - again! The dealer replaced it a couple of years ago when it was still under warranty with the new and improved version. Looks like it didn't hold.
I drove a busted crank pulley home from the track. It was fine as long as I kept the AC off and the boost in the vacuum range, i.e. no load on the 'charger.
Sometimes the issue is the gasket, not the housing. I just replaced the thermostat and gasket on my car, and it's a tricky bugger. The torque spec is really low, too, like 12 N-m. I lubed up both sides of the gasket with a little bit of Sil-Glyde to make sure it didn't bind when I tightened everything up.
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