1. Power Issues:
* Blown Fuse: Check the fuse box (usually under the hood and/or inside the cabin) for a blown fuse related to the blower motor. The owner's manual will show you which fuse controls the blower.
* Bad Blower Motor Relay: The relay acts as a switch for the blower motor. A faulty relay will prevent power from reaching the motor. You might need to test the relay with a multimeter or replace it as a troubleshooting step.
* Wiring Problems: Check the wiring harness leading to the blower motor for any broken, loose, or corroded wires. This can be tricky and might require some electrical knowledge.
* Switch Problems: The blower motor switch itself might be faulty. Try testing the switch with a multimeter or replacing it.
2. Blower Motor Problems:
* Failed Blower Motor: The blower motor itself could be burned out or seized. This is a common failure point. You'll likely need to access the motor (often under the dashboard) to test it or replace it. Testing involves checking for voltage at the motor connector while the switch is activated. A lack of voltage points to a wiring or switch issue, while voltage with no motor operation indicates a bad motor.
* Resistor Issues (if applicable): Some Windstars use a resistor pack to control blower speeds. A faulty resistor can cause the blower to not work at all or only at certain speeds. Again, this usually requires accessing it and testing its continuity.
3. Other Potential Issues:
* Control Module Problems: While less common, a faulty control module (part of the climate control system) could be preventing the blower from operating. This is more difficult to diagnose without specialized tools.
* Vacuum Leaks (for some models): In some years/models, vacuum lines control certain aspects of the climate control system. A leak in these lines could prevent the blower from operating correctly.
Troubleshooting Steps:
1. Start with the simplest: Check the fuses first. This is the easiest and cheapest fix.
2. Visual Inspection: Look for obvious damage to wiring or components.
3. Use a Multimeter: This is the best way to test for power at different points in the circuit (fuse, relay, switch, motor).
4. Consult a Repair Manual: A repair manual specific to your year and model Windstar will provide diagrams and detailed instructions.
5. Seek Professional Help: If you're not comfortable working with electricity, it's best to take it to a mechanic.
Remember to always disconnect the negative battery terminal before working on any electrical components in your vehicle. Safety first!
