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The light will flash if the vehicle senses that you should be in overdrive (based on speed) but aren't. There should be a button on the end of your gearshift lever to turn overdrive back on. The only time you should turn that off is, for example, if you are pulling a trailer in the mountains.

Turn OD back on and the light will stop flashing. If it doesn't stop then there is a problem with the transmission going into overdrive.

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Q: What would cause the overdrive light to flash on a 1999 ford windstar when you are doing about 55 miles per hour?
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