Only on a cold start do I hear this noise. She's a 92 ES300 with 149k and a new synthetic oil change as of last week. The noise comes from the left side of the engine and lasts about 30 seconds or so. It sounds like a squeal but I do not hear it at all when the car is warmed up. If I put it in reverse right after starting, I'll hear it, but it goes away right when I put it into drive. I've read the other posts about a similar noise on coldstarts and everyone says not to worry, but I'd prefer my car not making any noises whatsoever. According to my service records, the individual I bought the car from had the belts replaced about 40k ago. Do you think this problem can be fixed by tightening the belt or is it need of a belt replacement or pulley adjustment?