So I have a 2005 GMC Sierra 1500 pickup that is in great condition. Recently, I have noticed that in the mornings on my way to work the blower fan would not run on the highest setting. After a while of driving, the highest setting would then work. This happened for about two weeks. Now, the blower will not turn on at all on any setting. Thought it might a simple fuse, but that looks fine. Should I take it to the shop? Could it be the blower motor that needs to be replaced?