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If the 4HI 4LO light on your vehicle is blinking, it usually indicates an issue with the fourwheel drive system. Here are a few steps to try and resolve the problem:

1. Consult the owner's manual: Different vehicles may have different methods of troubleshooting and diagnosing fourwheel drive system issues. Start by referring to the owner's manual specific to your vehicle model for guidance on the meaning of a blinking 4HI 4LO light and potential solutions.

2. Check the switch or selector: Make sure the switch or selector for the fourwheel drive system is in the correct position. Ensure it is set to either 4HI or 4LO, depending on your intended use. Sometimes the switch can become bumped or accidentally moved, causing the light to blink.

3. Engage and disengage the fourwheel drive: Try engaging and disengaging the fourwheel drive system several times. This could potentially reset any electronic glitches or issues with the system. Follow the steps outlined in your owner's manual for engaging and disengaging the system properly.

4. Check for loose or damaged connections: Inspect the wiring, connectors, and vacuum lines around the fourwheel drive system. Loose or damaged connections could cause the 4HI 4LO light to blink. Secure any loose connections or replace damaged components as necessary.

5. Test the vehicle on different surfaces: Take your vehicle for a drive on different surfaces, such as grass or gravel, to see if the fourwheel drive system engages and disengages properly. This can help diagnose whether the issue is related to the system itself or a faulty sensor.

6. Have the vehicle scanned for error codes: If none of the above steps resolve the issue, it's recommended to have the vehicle scanned for error codes using a diagnostic scanner. This can help identify any specific problems with sensors, actuators, or other components related to the fourwheel drive system. Take your vehicle to a qualified mechanic or dealership for this diagnostic test.

Remember, these are general steps and may not apply to every specific situation. It's always a good idea to consult your vehicle's owner's manual and seek professional assistance if needed.

Additionally, in some cases, a blinking 4HI 4LO light could indicate a more serious issue with the fourwheel drive system. If you're unable to resolve the problem using the above steps, it's best to consult a qualified mechanic who can thoroughly diagnose and repair the issue.