I have a 1997 Honda Civic 5-speed with about 200,000 miles. It is making a low-pitched whining noise when I let the clutch out in neutral. I took it to a mechanic who immediately diagnosed it as the throwout bearing. Being mechanically inclined, I dropped the tranny and changed the clutch and bearing, but started it back up, and the noise is still there - as if I did nothing at all. It is not constant volume - sometimes it is louder than others. It is usually loudest first start of the day. I live in Houston, so its not like it is "cold", just not hot. To be fair to the mechanic, the bearing was quite corroded, but everything else seemed to be working properly.