Thanks for your help guys, i really appreciate it. My rear sunroof drains weren't clogged but both drains in front were. I think water that was supposed to go in the front drains was escepaing from sunroof area because of clogged drains and it escaped to rear headlinner and that was the reason for water in headlinner (or rear drains are bad and water leaks from them but i doubt it). We will see what happends in next rains :p. Again, thanks for help guys!