Here's how to troubleshoot and fix it:
1. Locate the Blower Motor Resistor:
* Most likely location: Under the dashboard, usually on the passenger side, near the blower motor itself. You'll likely need to remove some trim panels to access it. Consult a repair manual (Chilton's or Haynes) specific to your 2003 Chrysler Town & Country for precise location and removal instructions. These manuals show diagrams and often have step-by-step instructions with pictures. Online repair manuals are also available.
* Other possible locations: Some models might have it in a different area under the dash or even in the engine compartment (less likely).
2. Inspect the Blower Motor Resistor:
* Visual inspection: Once you've located it, check for any obvious signs of damage, such as burning, melting, or loose connections. The resistor is usually a small, rectangular block with multiple terminals.
* Check for continuity: If you have a multimeter, you can test the resistor's resistance. The readings will depend on the specific resistor; you'll need to consult a wiring diagram to know the expected resistance values for each speed. If you get an open circuit (infinite resistance) on any of the legs, that indicates a faulty resistor.
3. Replace the Blower Motor Resistor:
* Purchase a replacement: Get a new blower motor resistor from an auto parts store. Make sure you get the correct part for your specific year and model. Provide the VIN number to ensure you receive the right part.
* Installation: Follow the reverse procedure of removal to install the new resistor. Make sure all connections are secure.
Other Possible (Less Likely) Causes:
* Blower motor itself: While less common than the resistor, a failing blower motor could also exhibit this symptom, especially if it's noisy or struggles to turn at lower speeds. You can try tapping on the blower motor gently (with the power OFF) to see if it helps. If it's noisy or makes grinding sounds, it might need replacement.
* Wiring harness: A problem in the wiring harness leading to the resistor or blower motor could also be the issue. This is less common but possible. Check for broken wires, frayed insulation, or corrosion in the wiring harness connectors.
* Control module (less likely): In rare cases, the HVAC control module itself could be faulty. This is usually diagnosed after checking the resistor and blower motor.
Important Notes:
* Disconnect the battery's negative terminal before working on any electrical components in your vehicle. This prevents accidental short circuits and protects you from injury.
* Use a repair manual: A repair manual specific to your vehicle will greatly assist in locating the resistor and providing step-by-step instructions for its replacement. Don't try this blind.
* If you're not comfortable working on your car's electrical system, take it to a qualified mechanic. Improper repair can lead to further damage.
The blower motor resistor is the most probable culprit in this scenario. Addressing this should resolve your issue. However, if replacing the resistor doesn't fix the problem, further diagnostics are needed.
