odd squeak/squeal

[Joseph Cianciotti <jmc987@earthlink.net>]

Now that it's freezing in the S.F. Bay Area, my car is making a strange 
noise as it warms up.  It's almost like the squeal you'd get from a 
slipping belt, but it's not as high pitched. It sounds louder from the 
interior of the car than it does from under the hood. And it seems to be 
coming from the lower firewall area. Any ideas? Thanks in advance.

Joseph
67 MGB Roadster