However, the high-speed-only operation *strongly suggests* a faulty blower motor resistor (not the relay). The resistor controls the different fan speeds. If it's failing, only the highest speed (which bypasses the resistor) will work.
To find the relay AND determine if it's truly the problem:
1. Consult your owner's manual: It *might* have a diagram of the fuse and relay boxes.
2. Locate fuse/relay boxes: There's usually one under the hood and another inside the vehicle (often under the dash).
3. Use a wiring diagram: You'll need a wiring diagram specific to your 2002 Town & Country's year and trim level. These are available online (often for a fee) through repair manual sites like Mitchell 1, Alldata, or others. The diagram will show the relay's location and how it connects to the blower motor and resistor.
4. Test the blower motor resistor: This is the more likely culprit. You can usually access it fairly easily under the dash, often near the blower motor itself. Visually inspect it for damage. A multimeter can help confirm whether its resistance values are correct at various speed settings (comparing them to values in a repair manual).
5. Check the blower motor itself: While less likely, a failing blower motor can also cause intermittent or speed-related problems. You should check for any obvious issues.
In summary: While a faulty relay *is* possible, the symptoms point much more strongly to a problem with the blower motor resistor. Focus your diagnostic efforts there first. Replacing the resistor is usually a much simpler and less expensive repair than replacing a relay, especially if you have to hunt down the correct relay location first.
