pull the top cowl up right behind the windshield. its just clips so just pry and be gentle. then remove the 2 screws that hold the top of the center dash, then on that is behind the ash tray. then pull dash out. next remove screws from hvac panel. then unplug wiring harness from blower motor switch. then un screw switch.
Replace fan switch.
Replace the blower motor resistor.
In a 1997 Jeep Wrangler, the relay switch for the heater blower and motor is located behind the dash. It will be directly behind the HVAC knobs behind the dashboard.
replace the blower motor switch
The blower motor is drawing to many amps, replace the blower motor.
If there is current going through the wire to the blower switch, try bypassing the switch with a jumper wire. If the blower motor works, then replace the switch. If the blower motor does not come on, then you probably need to replace the blower motor.
Either your switch is messed up, or more likely the blower motor resistor is bad.
Check to see if you are getting power to blower motor - if so replace blower motor If not check fuse, switch, resistor pack.
The fuse. The blower motor speed resistor. The blower motor relay. The blower motor switch. Check for power at the blower motor connection.
Take the old one out and put the new one in.
Either replace the burnt wire or run new to the blower motor with a toggle switch.
The first thing I'd look at is the switch and then the connections to the blower motor. Try bypassing the switch and see if the blower motor starts. Also, don't forget the fuse controlling the blower motor. Replace it with a fuse of similar size and see if that corrects the problem. If all else fails, just replace the blower motor unit with another. Go to the wreckers and you can get it for less than half price.