1. Check the Fuses and Relays:
* Locate the fuse box(es): Your Impala likely has one under the hood and another inside the cabin (often under the dash). Consult your owner's manual for exact locations.
* Identify the relevant fuses and relays: Look for fuses labeled "AC," "blower," or "fan." There might also be a relay specifically for the blower motor. The manual will help you identify them.
* Inspect fuses: Check for blown fuses (a broken filament). Replace any blown fuses with the correct amperage.
* Check relays (if applicable): You can visually inspect relays for any obvious damage. A more thorough test involves swapping a known-good relay of the same type with the suspected faulty one to see if the fan starts working.
2. Check the Blower Motor Resistor:
The blower motor resistor controls the fan speeds. A faulty resistor can prevent the fan from working at all or only at its highest speed.
* Locate the resistor: This is usually located behind the glove compartment or under the dash. Access may require removing some trim panels. Your owner's manual or an online repair guide for your specific year and model will help you locate it.
* Inspect the resistor: Look for any visible signs of burning, melting, or damage. Often, the resistor is a small plastic unit with multiple terminals.
* Test the resistor (optional but recommended): You can test the resistance of the resistor using a multimeter to confirm if it's faulty. Again, online resources will show you how. Replacing it is usually a relatively inexpensive repair.
3. Check the Blower Motor itself:
If the fuses, relays, and resistor are all good, the problem likely lies with the blower motor.
* Locate the blower motor: It's typically located behind the dashboard, often requiring removal of various components to access.
* Test the blower motor (optional but recommended): You'll need to disconnect the electrical connector to the motor and apply power directly (using jumper wires and a battery) to see if the motor spins. Exercise caution when working with electricity. If it doesn't spin, the motor is likely faulty and needs replacement.
4. Check the Wiring and Connections:
* Inspect the wiring: Look for any broken, frayed, or corroded wires in the circuits leading to the blower motor, resistor, and relays. Pay close attention to the connections.
* Check for loose connections: Ensure all connectors are securely plugged in.
5. Consult a Repair Manual:
A repair manual specific to your 2001 Chevy Impala will provide detailed diagrams, procedures, and torque specifications to aid in troubleshooting and repairs. You can often find these online or at auto parts stores.
Important Considerations:
* Safety First: Always disconnect the battery's negative terminal before working on electrical components in your vehicle.
* Professional Help: If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic.
By systematically checking these components, you should be able to identify the cause of your AC fan motor problem. Remember to consult your owner's manual or online resources specific to your vehicle's year and model for detailed instructions and diagrams.
