124- What was that squeeling sound behind the glove box?

[Paul T]

1989 300E with 188k miles; 15 degrees outside this morning, and there is a new sound, a squeeling motor or bushing, just forward of the glove box, and aft of the firewall. It is not affected by any of the blower, vent, climate control switches. I imagine it will go away once things warm up, but what is running away full time in there, whenever the ignition switch is ON, as in engine would be running?