look for the PCV on the side on the valve cover just passed the oil filler cap, when you do the timing belt do the tesioners and get a new tensioner spring, also buy a Kia dealer water pump only, you can get into big problems with after market ones not being the right one. the nosie you are getting unless I was standing there don't know off the top of my head.

2001 5sp. K&N stock filter 215/70/15
If your check engine light is on at least you know the light still works