Q: loud buzzing on driver side while in motion. no dash lights on?

Hello, thank you for writing in. There are several moving parts that can cause a vibration in regards to the air conditioning system. You or a technician will have to go through the components one by one until the vibration is located. Make sure the car is on, AC running, parking brake on, and physically go through the system. Start with the compressor, as it is not only attached to the drive belt, but it works hard to pressurize the system. If it is not the source of the noise and vibration, look to the blower motor that pushes the cold air into the cabin. You can then look into the condenser and the lines. For more help with diagnostics or repairs, contact our service department to schedule an appointment.