My fan runs as soon as you turn ignition to run

SOURCE: 1989 F150 ignition cylinder switch

Remove the ignition switch cylinder and inspect the contacts in the column. Look for dark spots, scratches, excessive scuffing. My guess is that cleaning the contacts with a little tiny piece of sandpaper and perhaps bending them out a little (so there is more pressure between the contacts when you reinstall the cyclinder) will cure the problem.

SOURCE: 95 F150 wont crank

the starter should be replaced. The solenoid is kikcing the pinion out but there is no contact being made to turn the starter motor. I have the exact same truck and before i changed the starter used the old starter tap trick. Tap the starter casing with a hammer and it should start turning again. hope this was helpful for you. Good luck.

SOURCE: starting problems

This is caused by the PCM not powering up. I would replace the PCM power relay in the battery junction box(fuse box under hood).

SOURCE: Ford 1995 F150 Truck. Turn ignition key off but Truck still runs

ignition switch electrical portoin above brake pedal on steering column

shack

SOURCE: when I turn off my ignition, my heater fan will keep running

I just started experiencing the same problem. Yes, typically after rainy days, I can never get the interior lights to go out after the ignition key has been removed. The car acts as if there is a door open. Now, my latest problem is with the heater fan. Of course, putting the control in the "off" position will turn it off but you can turn it on and off with no ignition key installed. I'm also having problems with my heater core too so it's been a pain in the but!!

I believe this problem has also caused my battery to die which is why I'm on this site in the first place!! I can't get into the car with the keys and the dead battery won't allow me to unlock the car!! When it rains it pours!!!