Where do you find the switch that controls when electric fan comes on in a 1994 Chevrolet Camaro?

The 1994 Chevrolet Camaro's electric cooling fan doesn't have a simple on/off switch you can manually control like a household fan. The fan is controlled by the PCM (Powertrain Control Module). This computer monitors various engine sensors (like coolant temperature) and activates the fan when necessary to maintain the optimal operating temperature.

Therefore, there's no switch you'll find to directly control it. Any attempt to manually override the system could damage your engine or electrical system. If your fan isn't working correctly, you'll need to investigate the problem using a diagnostic scanner or through testing related components (relays, fuses, temperature sensors, etc.) A mechanic would be best equipped to handle this.