How do I change my Blower switch on 95 toyota t100?

Had that exact same problem on a 94 Tacoma - no blower fan in any position - went through ALL the normal stuff - even disassembled the blower switch! .. Finally found a rather large wire connected to the under hood fuse box that had corroded and lost connection, fixed that connection and blower worked great - on all speeds... May or may not be your problem but I really don't think the switch is the culprit, they 'rarely' fail... Turn key on and blower to high .. Wiggle test the wiring at the under hood fuse box and listen for blower to turn on... Don't know your skill level but you may be able to run your own hot wire to the switch feed circuit for testing. One more thing, on this truck there was a separate fuse over on passenger side about the glove box that was in the blower circuit as well, I thought for sure that was it but it wasn't.. Just thought I'd mention that as I think the T-100 is just a blown up (enlarged) version of the Tacoma.. Good luck!