How do you change the heater fan on a 2003 Toyota Echo?

To change the heater fan on a 2003 Toyota Echo, start by disconnecting the battery to ensure safety. Remove the under-dash panel on the passenger side to access the blower motor. Unplug the electrical connector, then unscrew and remove the blower motor from its housing. Install the new fan by reversing the process, making sure to securely fasten everything and reconnect the battery.