Other, less likely possibilities include:
* Blower motor switch: A faulty switch could be sending only the high-speed signal, though this is less common than a resistor issue.
* Wiring issues: A short circuit or broken wire in the blower motor speed control circuit could also lead to this problem.
* Blower motor itself (rare): While less likely, a problem *within* the blower motor could also cause this. It's more probable to hear unusual noises or complete failure in this case, though.
Troubleshooting steps (in order of likelihood):
1. Check the blower motor resistor: This is usually located behind the glove compartment or under the dash. Access it (you may need to remove the glove box), visually inspect it for any obvious damage (burn marks, etc.), and test its resistance with a multimeter if you have one. If it's burned or shows incorrect resistance values, replace it. This is the most likely and easiest fix.
2. Inspect wiring: Once you've accessed the resistor, carefully examine the wiring connected to it and the blower motor switch for any signs of damage, fraying, or corrosion. Repair or replace any damaged wiring.
3. Test the blower motor switch: This is more involved and requires some electrical testing with a multimeter to determine if it's sending the correct signals for different speeds.
4. Test the blower motor: This is usually the last thing to check as it's less likely to be the cause in this specific symptom. You'll need to disconnect the motor and test its resistance.
If you're not comfortable working with car electrical systems, it's best to take your Dakota to a qualified mechanic for diagnosis and repair. Replacing the resistor is relatively inexpensive and often a simple DIY job, but improper electrical work can be dangerous.
