Auto Parts: 1979 Chevy Truck, fuse holder, chevy truck

Question
I purchased a 1979 Chevy truck awhile ago and the air conditioning had been removed from under the hood.  When I drive it now the fan motor blows constantly.  I was wondering what i should do to fix this. Thanks.

Answer
    I assume that you tried to turn it off with the switch and nothing happened.  In an older vehicle like this, the fan switch operates completely independent of the A/C-heater system, so it's hared to believe that the removal of the A/C caused this problem.  You don't say how much of the A/C system they removed.  If they took out the evaporator and its' box, they may have damaged one of two components: the fan motor relay, or the fan speed resistor.  The resistor is located inside of the box, the relay screwed to the outside.  You're going to have to follow the wire from the single terminal on the fan motor (since we really don't know what they did to this thing) and follow it back to the relay, then to the resistor and then to the switch.  Somewhere along there the wire is either pinched or shorted to itself (possibly on purpose for some unfathomable reason).  I'd be tempted, in that case, to go to a parts store and get a universal three-speed fan switch, which will have the resistors built into it, and install it in or under the dash.  Find a hot terminal on the ignition switch (one that's only hot when the switch is on) splice into it, add a fuse holder fused for 20 amps, and run that wire to the new switch.  Run the wire from the other terminal on the switch directly to the terminal on the blower motor, make sure that the housing of the blower motor is properly grounded to the metal body, and you'll be good to go.  I wonder why they removed the A/C from the truck?  There probably isn't an easier to fix, or cheaper to fix, system in any car or truck on the planet.