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 resistor.
the switch, or the blower motor resistor, or blower motor usually it the last two at one time
Check to see if you are getting power and ground to the blower motor - if so blower motor is bad. If no power possibly fan switch or selector switch Also check the blower motor resistor, found in heater plenum.
Blower motor fuse is blown. Blower motor resistor burned out. Blower motor switch bad. Blower motor bad.
Heater motor switch and or the connection at the switch is melted. Also check connections at the blower motor and blower motor resistor for melt down damage.
Blown fuse, bad heater blower motor control switch, bad blower motor, or a bad blower motor resistor pack.
Depends on what you mean by heater will not work. If the blower motor will not work, it can be a blown fuse, bad blower motor, bad blower motor switch, or a defective blower motor resistor pack. If you mean that the blower motor works but there is no heat, then it can be a clogged heater core, thermostat stuck open, or defective heater control valve.
the heater blower fan is in the heater housing assembly on the passenger side. You need to take out the whole housing assembly in order to access the blower.
Blown fuse? Bad blower motor? Bad blower motor resistor? Bad blower motor switch?
Replace fan switch.
Blown fuse. Burned out blower speed resistor. Faulty blower switch. Bad blower motor.
Blown fuse, defective Blower Motor Resistor Pack, Defective Blower Motor, or Defective Blower Motor speed control switch.