Could a bad blower motor resistor also affect the AC switch?

Yes, a bad blower motor resistor can affect the AC switch's functionality. The resistor controls the speed of the blower motor, so if it malfunctions, it may prevent the blower from operating at the selected speed. This can lead to inconsistent airflow and might make it seem like the AC switch itself is not working properly. In some cases, it could also affect the overall climate control system in the vehicle.