1. Check the antenna:
- Ensure that the antenna is properly connected to the radio. Look for any loose or disconnected wires.
- Inspect the antenna for any physical damage, such as bends, cracks, or corrosion.
- Try moving the vehicle to a different location to see if the signal improves.
2. Check the radio settings:
- Verify that the FM tuner is selected on the radio.
- Check if the radio is set to Mono mode instead of Stereo. Mono mode might have better reception in weak signal areas.
- Try manually tuning to a known strong FM station to see if it can be received.
3. Check the radio's internal connections:
- While the radio is turned off, disconnect and reconnect the wiring connectors to the back of the radio to ensure a good connection.
4. Update the software:
- For newer Windstar models with in-dash navigation and entertainment systems, consider checking if there are any available software updates. Updates might include improvements to radio performance.
5. Check the fuse:
- If the AM radio works but not the FM radio, check the fuse box to see if there's a separate fuse for the FM antenna. Replace it if necessary.
6. Consider signal interference:
- Certain electronic devices, such as mobile phones or other transmitters, might cause interference with the FM radio signal. Try turning off these devices or keeping them away from the vehicle to see if it resolves the issue.
If the issue persists after trying the steps above, it's recommended to visit a reputable automotive service center for further diagnostics and repair. They will have the tools and expertise to identify and fix the exact cause of the FM radio signal issue.