So, the temperature gauge bottoms out, and the DIC says "A/C off due to emgine temteratures," or some such. Having been though this with the Monte, where I broke the connector in the process of changing the #1 spark plug, I deduced it was the coolant temperature sensor, and replaced it. Start the car, still no temperature reading, same DIC message.

Did I get a defective sensor, or could something else be wrong? The current connector seems just fine.