Can-do,

Do you mean lubrication on the idler pulley. If so, I think you may be right. I ran a few errands today and no squeal. I let the car sit outside for a while, as I put the plow on the garden tractor, snow on the way.

While I was working, it got much colder, and when I got deployed to the movie rental and grocery stores, the squeal.

At this point, I think it is the idler pulley. I can see where the belt is frayed a little, which tells me that this is the belt that has been slipping.

I'll look at again tomorrow, but at this point I think I am going to try some belt dressing as a short term fix, and order a new belt and idler pulley.

If that's not it, there may be something in the compressor that doesn';t like the cold weather.

JCD