HI I have recently bought a used Aurion Prodigy 2007 model , when I bought it i was not making any noise at all , but after few days it start making some weird noise like chih chik chik chik , and this noise only comes when I'm not moving or accelerating. It's there when I start the engine , it's there when stop at traffic signal after running few KMs and this significantly increases when I switch on ACon. I'm new to Toyota world , infect this is my first car . The sound is to annoying and all I can do while driving is trying to ignore the sound :-) . Please help me out. Regards.