To troubleshoot, you should:
1. Check the Blower Motor Fuse: Consult your owner's manual for the correct fuse location and rating. The fuse box is usually located under the hood or inside the car (often under the dash). The fuse might be labeled "blower," "HVAC," or something similar, but it could also be a generic fuse for that circuit.
2. Inspect the Blower Motor Resistor: This component controls the fan speeds. It's typically located behind the glove box or under the dash. It's a small rectangular box with several wires connected. Visually inspect it for any signs of burning, melting, or damage. If it looks suspect, it's likely the culprit and needs replacement.
Important Note: Before working on any electrical components, disconnect the negative battery terminal to prevent accidental short circuits.
If both the fuse and the resistor appear to be good, the problem might lie within the blower motor itself or the wiring. At that point, you'll likely need professional help from a mechanic or auto electrician.
