1. Fuses and Relays:
* Locate the fuse box(es): Your Durango likely has an under-hood fuse box and an interior fuse box (often under the dash). Consult your owner's manual for the exact locations and diagrams.
* Check the blower motor fuse: The manual will specify the amperage and location of the fuse for the blower motor. Visually inspect the fuse for a blown filament (a broken wire inside). Replace it with a fuse of the *same* amperage if it's blown.
* Check the blower motor relay: Again, the owner's manual will show the relay location. You can often swap the relay with a similar one (same amperage rating) from another circuit (like the wipers, for example) to test if the relay is faulty. If the blower works after swapping, the original relay is bad.
2. Blower Motor Resistor:
* Location: The blower motor resistor is a common failure point. It's often located behind the glove box or under the dash. Consult a repair manual or online forum specific to your Durango year and model for the exact location.
* Testing: You might be able to visually inspect it for burn marks or other signs of damage. A multimeter can test the resistor's resistance values; however, this requires some electrical knowledge. A faulty resistor often leads to only one or some blower speeds working (if any at all). Replacing the resistor is often a simple fix if it's faulty.
3. Wiring and Connections:
* Visual Inspection: Check all wiring related to the blower motor, including the connectors at the blower motor itself, the resistor, and the fuse/relay. Look for any broken, frayed, or corroded wires. Repair or replace damaged wiring as needed.
* Connector Checks: Carefully inspect all connectors for corrosion or loose connections. Clean connectors with a contact cleaner and re-seat them firmly.
4. Blower Motor Switch:
* Testing: This is more difficult to test directly without a multimeter. If all fuses, relays, and wiring check out, the blower motor switch itself could be faulty and preventing power from reaching the motor. Replacement is often necessary.
5. Blower Motor:
* Testing: This is usually the last thing to check. If power is confirmed at the blower motor connector, and the wiring is good, the motor itself might be burned out. Testing the motor requires removing it and using a multimeter to check for continuity. Replacement of the blower motor is typically the most involved repair.
Important Considerations:
* Consult a Repair Manual: A service manual specific to your 2001 Dodge Durango will provide detailed diagrams, locations, and troubleshooting steps.
* Safety First: Disconnect the negative battery terminal before working on any electrical components.
* Professional Help: If you're not comfortable working with automotive electrical systems, it's best to take your Durango to a qualified mechanic.
By systematically checking these components, you should be able to identify the cause of the problem. Remember to always refer to your owner's manual and consider seeking professional help if needed.
