Here's how to troubleshoot and fix it:
1. Locate the Blower Motor Resistor:
* Most common location: Under the dashboard, usually on the passenger side. It's often a small, black rectangular box sometimes attached to the HVAC housing. You might need to remove some trim panels to access it. Consult your repair manual for the exact location in your specific van model. Online repair manuals or forums specific to your year and model can be incredibly helpful.
* Less common location: In some cases, it might be located behind the glove box or even within the HVAC unit itself (requiring more extensive disassembly).
2. Inspect the Blower Motor Resistor:
Once located, visually inspect the resistor for any obvious signs of damage:
* Burn marks: Look for discoloration, melting, or obvious burning.
* Loose connections: Check the wiring connections for corrosion, looseness, or broken wires.
3. Test the Blower Motor Resistor (Optional but Recommended):
Testing requires a multimeter. If you're not comfortable with electrical testing, skip this step and proceed to replacement. If you do test, consult a wiring diagram for your vehicle to ensure proper testing procedures. Incorrect testing could damage your electrical system.
4. Replace the Blower Motor Resistor:
If the resistor is visibly damaged or tests faulty, replacement is the solution.
* Purchase a replacement: Get a new blower motor resistor specifically for your 2003 Dodge Ram Van 1500. Use your vehicle's VIN or year/make/model to ensure compatibility at an auto parts store.
* Disconnect the battery's negative terminal before starting any work on the electrical system – this is crucial for safety.
* Remove the old resistor: Carefully disconnect the electrical connectors and remove the old resistor from its mounting location.
* Install the new resistor: Install the new resistor, ensuring the connectors are securely attached in their proper locations.
* Reconnect the battery: Reconnect the negative battery terminal.
* Test the blower: Turn on the ignition and test all blower speeds. All speeds should now function correctly.
Important Considerations:
* Repair Manual: A repair manual for your specific vehicle will be extremely helpful in locating the resistor, providing diagrams, and guiding you through the removal and replacement process.
* Safety First: Always disconnect the negative battery terminal before working on any electrical components.
* Difficult Access: Accessing the blower motor resistor can sometimes be challenging, requiring the removal of various dashboard components. Be prepared for this possibility.
If replacing the resistor doesn't solve the problem, other possibilities (though less likely given your description) include a faulty blower motor switch or a wiring issue. A mechanic can diagnose these more complex problems.
