Why is the 4wd light flashing on your 1993 ford aerostar XL awd van?

The flashing 4WD light on a 1993 Ford Aerostar XL AWD van typically indicates a malfunction in the all-wheel drive system, which could be due to a faulty sensor, an issue with the transfer case, or low fluid levels. It may also signal that the system is trying to engage or disengage improperly. To diagnose the issue, it's advisable to check for any trouble codes using an OBD-I scanner and inspect the vehicle's drivetrain components. If the problem persists, consulting a professional mechanic is recommended.