What is the operating temperature for a 1992 Chevy s10 pickup with air conditioning?

There isn't a single "operating temperature" for a 1992 Chevy S10 with AC. The ideal operating temperature for the engine coolant is typically between 195-220°F (90-104°C). This is irrespective of whether the AC is on or off. The thermostat is designed to maintain this range.

The AC system itself operates at much lower temperatures, with refrigerant typically around 30-50°F (-1° to 10°C). However, this is a different system and not related to the engine's operating temperature.

If the engine is overheating (above 220°F/104°C), that's a serious problem regardless of AC use and requires immediate attention. The AC compressor might put a slightly higher load on the engine, but it shouldn't cause overheating unless there's already an issue with the cooling system.