2003 Denali Driver Window Issue

[FFMedic]

I have a '03 Denali that I bought last summer. Now that the weather is turning cold, I have noticed that the driver's side window won't roll down in the morning after sitting all night in < 32 degree weather. After the interior warms up or if sitting in sunlight, the window works fine. Question is this a motor issue or for some reason condensation is freezing the mechanism.