Where is the ac - heater fan fuse on a 2003 Toyota Echo?

It is not a fuse. It is a relay switch located in the same location as the fuses - it is next to the right fender if you are facing the front of the vehicle and looking under the hood. The fuse box is clearly labeled and any beginner can replace the relays because they are easy to plugin and unplug. On my 2000 Echo, I think fan blower relay #1 was out so I replaced the relay that was labeled as such. The underside of the fuse box cover clearly labels each relay in the fuse box.