I can hear some of you cheering and exchanging high fives. But, it is a fun car and I like it. Anyway, when I open the sunroof, I like to roll down the back windows to get good air flow into the cab. I have power windows and when I roll up or down the back passenger window, it makes a horrible screeching sound. There is no smell of smoke or anything burning, so I don't know if it is the motor or if something needs to be greased. Any suggestions?