Cars Q&A

I bought santro xing XS,2004 october make at 2.07 Lakhs..I consulted huyndai expert and shown that car to them before finalizing and their feedback was very good ab engine except they told right rear wheel u need to replace a bush and there is a small leakage on cylinder. Today i got the delivery and it was all fine till car reached home. But after that a noise coming from rear wheel..(Chuuuuuuk...chuk and khadam khadam)...i m worried wht is happening..pls suggest and also the pickup is excellent without AC but after switching on AC pick up is xtremely bad....Plssssssssssss suggest..Folks pls help me with the solution...its my 1st car