Ok so I go to drop my daughter off at dance class, turn the key off and the blower motor is still running.

97 f250 7.3

My first thought was an ignition switch, so I stopped and picked one up.
Got home, unplugged the old switch and the blower is still running.
The fuse is staying hot all the time.

Kind of at a loss here, any ideas?

 

Check to see if the turn signals work as well with the key off. The source of voltage for fuse #1 also shares with #7, which powers the T/S flasher.

 

Problem solved today,,,,,

Apparently at one time, a trailer with some shorted wiring was hooked to this truck, blew the brake light fuse,
No replacement fuses, ssooooooooo, a peice of wire jumpered from the brake light switch to #7 fuse to get brake lights, and the truck out of gear.
After the brake light fuse was replaced,, same jumper, backfeeds to #7, which in turn backfeeds to #1, and my hvac is on all the time!

Replaced some burnt wires, removed the jumper and all is well again!

 

WOW, never,ever ever ever would have guessed that! Good find