Bad fan clutch?

[ree]

Last fall I started noticing a whine/whoosh from engine that increased as I accellerated and stayed pretty constant at speed. It went away during the winter and the dealer could not reproduce the noise when I had it in then. Now with temps rising into upper 40's and above it's back.

From my h2source research it sounds like maybe the fan clutch staying engaged all the time.

Is there an easy way for me to tell if this is the case? e.g. can I watch the fan speed at cold start versus when it's running warm at idle with the hood up and reach any conclusions about whether it needs to go to the dealer?