Here's how to troubleshoot and potentially fix the problem:
1. Check the Wiper Switch:
* Visual Inspection: Start by carefully inspecting the wiper switch itself. Look for any obvious signs of damage, melting, or loose connections. You might need to remove the steering column cover to access it properly. Be cautious – there are often airbag components in this area. If you're unsure, consult a repair manual.
* Testing (Advanced): If you have a multimeter and are comfortable with electrical testing, you could test the switch to see if it's sending the correct signals to the wiper motor at lower speeds. This is more complex and requires a wiring diagram specific to your Chevrolet model.
2. Locate and Inspect the Wiper Motor Resistor:
* Location: The resistor is usually located somewhere under the dash, often near the wiper motor itself, or in the fuse box area. Your Chevrolet's repair manual will be the best resource to pinpoint its location. It might be a small, usually black, cylindrical component with several wires connected.
* Visual Inspection: Check the resistor for any signs of burning, melting, or loose connections. A burnt smell emanating from this area is a strong indicator of a faulty resistor.
3. Testing the Resistor (Advanced):
* Multimeter Required: If you have a multimeter, you can test the resistance (ohms) between different terminals of the resistor to check for continuity and correct resistance values. Again, you'll need a wiring diagram to know which terminals correspond to which speeds.
4. Replace the Wiper Motor Resistor:
* Purchase a Replacement: If you find the resistor is faulty (visually damaged or testing indicates a problem), purchase a replacement. Be sure to get the correct one for your specific 1994 Chevrolet model. The part number should be available from a parts store (online or local) if you provide them with your vehicle's VIN.
* Installation: Carefully disconnect the wires from the old resistor, noting which wire goes to which terminal. Install the new resistor, ensuring the wires are correctly reconnected.
Important Considerations:
* Repair Manual: A repair manual specific to your 1994 Chevrolet model is highly recommended. It will provide diagrams, location information, and troubleshooting steps.
* Safety: Disconnect the negative battery terminal before working on any electrical components.
* Professional Help: If you're not comfortable working with car electrical systems, it's best to take your vehicle to a qualified mechanic.
In short, the most likely fix is replacing the wiper motor resistor. But thorough visual inspection and maybe some testing (with the right tools and knowledge) is a smart first step before spending money on parts.
