Where is the fuse for the heating fan

In case you don't have the owners manual to refer to - here is a link to a diagram for the fuse boxes and fuses: https://www.autogenius.info/toyota-tacoma-2005-2008-fuse-box-diagram/

I believe you mean the blower motor fan. The fuse location is in your owners manual,in the index,under fuses. if you don't have an owners manual,see the link below,free download owners manual. https://justgivemethedamnmanual.com/toyota/2005-toyota-tacoma-owners-manual/