the lights or heat. Whats wrong? Someone mentioned it could be the serpentine belts, so I have had the serpentine belts replaced on the car and the noise continued. It only seems to do this when I turn on the lights or the heater, or right when I start the car in the morning. It gets louder when I press the gas and eventually stops after the car runs for a bit. The noise is definitely coming from the front passenger side around the area where the serpentine belts are. Car runs fine, but the noise is really loud and obnoxious. Any suggestions?