02 Explorer Climate Control Squeak

Hi all,

Another (but much smaller problem) with my Explorer. Today (cold morning) I noticed that after I started up and raised the temperature on the climate control, each time I would press the button I would get a loud squeak from...somewhere. I have never noticed this on a warm day but a few times on cold mornings. It also is much less severe after the first initial squeak.

Ever heard of this?

Thanks