A seized AC Compressor clutch can throw or break the serpentine belt. With most engines, this results in a no-run situation as the water pump is driven by the belt. On 3126 type engines with a separate water pump v belt, one can limp into a repair facility. On the C9, you are dead in the water.
The AC compressor can be bypassed with the right belt, giving one the ability to get to repair facility under your own power. I found that the Gates K080751 belt will suffice. It is about an inch longer than absolutely needed but the tensioner takes up the slack sufficiently. I wouldn't recommend running at max engine RPMs but to get you to a repair facility it should be fine. I got mine at Rock Auto for just under $25 including shipping.
Steve