1. The Easy Checks (Before diving into deeper repairs):
* Fan Speed Control: Is the fan switch on? Try all fan speeds. A broken switch is a common culprit.
* Fuse: Check the fuse for the heater blower motor. Your owner's manual will tell you which fuse is responsible. Look for a blown fuse (broken filament).
* Blower Motor Resistor: This component controls the fan speeds. A faulty resistor can prevent the fan from running at all, or only at one speed. This is often located behind the glove box. Accessing it might require removal of the glove box.
* Check the obvious: Are the vents closed? Is the climate control system set to blow air to the front?
2. More Involved Checks:
* Blower Motor itself: If the fuse and resistor are good, the blower motor itself could be faulty. This requires accessing the blower motor (often under the dashboard) and testing it with a multimeter to see if it's receiving power and if the motor itself is functioning. This is a more involved task.
* Wiring: There might be a break or short in the wiring between the switch, resistor, and the blower motor. This requires tracing the wires and visually inspecting them for damage.
* Vacuum Lines (if applicable): Some climate control systems use vacuum lines to control air flow. A leak or blockage in these lines could affect the blower. These are usually made of thin plastic tubing.
3. Advanced Troubleshooting (Best left to a mechanic):
* Control Module (Climate Control Module/BCM): A problem with the electronic control module can prevent the blower motor from working. Diagnosis requires specialized tools.
* Grounding Issues: A poor ground connection can interrupt the electrical circuit to the blower motor.
Recommendations:
1. Start with the simple checks: Fuses, switch, and the blower motor resistor are the easiest and cheapest places to start.
2. Consult a Repair Manual: A repair manual specific to your 2000 Ford Expedition will have diagrams and detailed instructions for accessing components and troubleshooting the heating system.
3. YouTube Tutorials: Search YouTube for "2000 Ford Expedition heater blower motor repair" – you might find videos showing how to diagnose and fix the problem.
4. Professional Mechanic: If you're not comfortable working on your vehicle's electrical system, take it to a qualified mechanic. Improper repairs can cause further damage or even create safety hazards.
Remember safety first! Always disconnect the battery negative terminal before working on any electrical components in your vehicle.
