I would try purging it again. Maybe this time jack up the front of the car a little, just to make sure all of the air bubbles/pockets are out. I would also take a trip to the dealer and get a new temp sending unit. It doesnt cost much, and its easy to replace. Did you check the coolant crossover tube that connects at the back of cylinder heads? They have been known to clog on cars over time, and could cause some air not to purge out of the system.
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Nick
97 Camaro SS, M6, Artic White, t top.
396, AFR 210's, single plane, Strange 12 bolt.
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