* Cruise control switch (located on the steering wheel): This is a common failure point. It's relatively inexpensive and easy to replace.
* Cruise control module (often integrated into other modules): This is the "brain" of the system. It's more expensive and may require professional diagnosis to determine if it's the actual problem. It's often integrated into the PCM (Powertrain Control Module) or another body control module, meaning a whole module replacement might be necessary.
* Vacuum lines: The Windstar's cruise control system uses vacuum. Leaks in the vacuum lines can prevent it from working. These are relatively inexpensive and easily checked.
* Speed sensor: The cruise control relies on accurate vehicle speed information. A faulty speed sensor can cause problems. This sensor is often part of the transmission or ABS system, so it's more involved to replace.
* Actuator (servo): This is the mechanical component that controls the throttle cable. It's relatively uncommon to fail but can be a problem.
* Wiring/connectors: Damaged or corroded wiring or connectors can interrupt the cruise control circuit. This requires careful inspection.
Before replacing anything:
1. Check the fuses: Start with the simplest and cheapest option. Consult your owner's manual to locate the cruise control fuse(s).
2. Have the system diagnosed: A professional mechanic can use a scan tool to check for diagnostic trouble codes (DTCs) that pinpoint the problem more accurately, saving you time and money on unnecessary part replacements. Attempting to diagnose this without proper tools can be a frustrating and costly exercise.
Replacing any of these components usually requires some mechanical aptitude. If you're not comfortable working on your vehicle, it's best to take it to a qualified mechanic.
