Hello

I have a 95 318ti and it has recently developed a squeal under the hood that
only occurs after the engine has warmed up. I have about a 20 minute drive
from work and it starts up quiet but by the time I get home it sounds like
there is a flock of birds under the hood. I tried to find the source of the
sound but I can't pinpoint since it seems to come from everywhere. I'm sure
its either a belt or tensioner pully but which one would be silent when cold
but start making noise when hot?

Thanks

Joe Fugazzi