* Blower Motor: This is the fan that moves air through the heater core. It will have a fuse. You'll need to consult your owner's manual to find which fuse is for the blower motor. The fuse box location is usually under the hood and/or inside the vehicle (often near the steering column).
* Heater Control Unit: This controls the fan speed and temperature settings. A problem here might not trip a fuse, but could be a faulty unit itself.
* Heater Core: The heater core itself rarely blows a fuse. A problem here would point to a coolant leak or blockage.
To find the correct fuse(s):
1. Consult your owner's manual: This is the best place to start. It will have a diagram of the fuse box(es) and specify which fuses control the blower motor and other relevant components.
2. Check both fuse boxes: 2000 Jeep Wranglers often have more than one fuse box, one under the hood and possibly one inside the vehicle.
3. Look for a fuse labeled "blower motor" or something similar: This is the most likely candidate for the heater fan.
If you can't find the problem using the owner's manual, it's best to have a qualified mechanic diagnose the issue, as several electrical components might be involved and incorrectly replacing fuses could cause further damage.
