[markbair]

The "clicking" noise that I heard from my TB was actually the fan clutch going bad. The speed of the clicking would not change when I revved the engine, so I knew it wasn't a valve or anything like that. Try revving the engine next time and see if that makes a difference. It didn't do it every time, only sometimes, and never for the dealer. Finally it went all the way out and stayed fully engaged. That is when the dealer finally replaced it. No more clicks since then.....finally.