2000 WINDSTAR TRANS LIGHT ON.STARTED WITH O/D LIGHT FLASHING YESTERDAY,THEN WENT OFF. TODAY TRANS LIGHT IS ON AND STAYING ON. 3.8 ENGINE-115K MILES- TRANS FLUID OK THANKS DAVE

Coolant temp sensor? These can be tested in cold, then hot water to see range of resistance.

"Extensive work" not. Try replacing the injector on #2 cylinder.

The flashing light means the overdrive will not work.
You could scan the computer and see if you have any trouble codes.
The codes will direct you as to what to test for the problem.

Transmission gear assembly and transmission needs inspection. Also check the transmission fluid level. Also is the fluid getting leaked or its low.

There are few very helpful links with solutions to troubleshoot this problem.

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I suggest you to refer these links.

Click the link below:-----

2000 Toyota Camry: Transmission slipping and Stuck up?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-camry-transmission-slipping.html

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Transmission Slips out of 2nd gear?

http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

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Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html

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2006 Ford Explorer: Engine Vibrates and gears slipping?

http://whatisbyme.blogspot.in/2012/06/2006ford-explorer-engine-vibrates-and.html

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Clutch slipping problem?

http://howtobyme.blogspot.in/2012/03/clutch-slipping-problem.html

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Dodge Anti slip System is not operating?

http://whatisbyme.blogspot.in/2012/07/dodge-anti-slip-system-is-not-operating.html

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OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

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Transmission fluid leaks near radiator on ford windstar?

http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

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Ford Windstar transmission fluid leaking?

http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

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TRANSMISSION REPLACING AND TROUBLESHOOTING

http://alltypesofpartsreplacing.blogspot.com/2012/12/transmission-replacing-and.html

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These details will help.

Thanks.

you need an alternator. it failed. have your alternator checked. im pretty sure (99.999999%) that it failed.

if your valves are not seating correctly you will get the problem your describing, however this doesn't mean you need a complete motor, but its still an expensive repair , so sit down when they tell you the price

check the transmission fluid, when it is low it can make the overdrive light blink

THE LIGHT INDICATES A FAULT WITH A SENSOR YOU NEED TO HAVE SOME ONE CHECK THE CODES

I would have the vehicle scanned to find out why the od light was flashing. When the light flashes there will be a diagnostic code stored in the engine computer. It sounds like the transmission overheated for some reason and vented the fluid. By the time you added fluid the transmission and started driving the transmission cooled down and quit leaking.

Torque converter is locking up, common for this model. My wife's is doing the same, just changed filter, fluid, and added Lucas trans fix. Hope this works for a little bit, 2000-2500 to fix this if not.