http://youtu.be/aZJp0mQlw-A After starting the engine, I hear a chirping noise that changes along with RPM, as in the video above. It is annoying and hopefully nothing too serious. I will likely need to have the alternator replaced because I think it's causing a parasitic drain, and the belt, tensioner etc would need to be removed. Is it worthwhile to replace any of that stuff at the same time? I don't know when the belt was last changed (no records) and the car has done roughly 150k miles so it might be time. I will likely have to take it to a mechanic anyway since the alternator job doesn't look like something I can do. I'm sure it's not easy to figure out the issue by just looking at a short video but any tips would be appreciated.