i have question... my TF 1998 been melted the fuse inside AC and heater.. every 5 days... what i have to do??

Check you are using the correct rated fuse and also check the fuse connector is bright/clean and grips the fuse tightly. If both these are OK then you must have a short somewhere and if it happens every 5 days it may be something loose causing an intermittent short. Has any work been carried out on the dashboard lately?