Hi, I have a problem with my VY Calais 2002. The rattling is quite intermittent as it happens whenever the a/c is in use for 3 times in a week but not sure if this is causing the problem. However, whenever I press on the accelerator the ratting noise comes out like tik tik tik tik tik and gets faster as I accelerates. When in idle, there is none. Went to my mechanic and replaced the Front Hub Wheel bearing and seems to fix the problem but after 2 weeks, problem comes out again. Please help.