Our 2004 Envoy rear ac does not blow. If I replace the fuse, it works for about 2 seconds then stops working. It is not blowing the fuse, just stops blowing.
If you are talking about the 30A RR HVAC fuse then I would suspect the solid state motor controller that the fuse provides power to is the trouble. Proper testing should be done to prove that before it is replaced though. The control lead needs to be checked to see if that is doing it’s job.