What Causes Abnormal Noise When Turning on the Car Air Conditioner?

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If turning on the air conditioner produces the following noises, it may be due to the following reasons: 1. The sound of the compressor belt, which could be caused by a faulty tensioner pulley or a malfunctioning compressor. This noise is usually heard in the engine compartment. 2. The sound of the blower motor, which is not only present when the air conditioner is on but also when the external circulation is activated. This noise is typically heard in the glove box and often sounds like a clicking noise. 3. A malfunctioning temperature control switch or the internal/external circulation motor inside the dashboard, which usually produces noise from the center console panel.