My engine seems to be making a ticking/slight knock noise. Can anybody give me some insight as to if this is normal noise. Engine has 110,000 miles on it, recent oil change with rotella. New timing belt and water pump. Being over-cautious but its always good to catch something before it becomes a huge problem. Also my A/C doesn't work, blows somewhat cool air but not cold. I know boxer engines are prone to certain noises but this has just got me thinking too much.. 2002 WRX Engine Noise - YouTube
If your not able to hear very well in this video, I can go out and try to get a better recording of it.