Hi all, Recently my car started throwing up hizzing sound during acceleration from the Car stereo. Music n all plays well but when the ac is on and whenever i try to acelerate i get this sound as if my sound my car has turned into plane and about to take off LOL. Please let me know what could be a the problem. also can we install 3rd party wiper blades made by Bosch for our car. Also i am planning to sell my Fiat punto 1.3 Diesel aug 2011 registered emotion model.i am getting offer of 2.80 is it good price considering fiat cars has less resale value. 46k driven and car is in super mint condition. Please advice.