1999 Chevy Tracker A/C blowing fuse

I had the exact same problem on my 1999 tracker 2.0L auto and I found the problem to be the red hot wire that runs out of the bottom of that fuse housing actually rubs up against the outer strut tower housing and over time wears away the insulation on that hot wire. It was difficult to see on mine but once I twisted the wiring and looked very closely I could see that the factory electrical tape and the insulation had been worn through to the bare wire creating a short to ground and blowing the fuse. I cut the old burnt worn out wire out and spliced in new wire of the same gauge and wrapped it properly with tape and no more problems. Goodluck.