The problem of the hiss in the stove appears in some owners of ix35 only with a closed deflector of the glove compartment and high turnover. Aerodynamic air flows appear to be the cause of the whistling. Some motorists failed to correct the defect even after contact with service centers.
Someone helped replace the stove engine, someone got rid of the whistle with silicone lubrication of fans or the replacement of the salon filter. Well, some optimists suggest "treating" a whistle in a Hyundai ix35 pastry.