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I should be able to answer your question if you say which YEAR of Ford Windstar ( I was looking at the 1996 Ford Windstar owners manual and it doesn't have any warning lights above the engine temperature gauge )
automatic transmission oil temperature warning light
If you mean the warning light just to the left of your engine temperature gauge that means that the engine coolant level in the coolant reservoir is low
One of the exterior bulbs has burned out if the warning light that looks like a light bulb ( located below your engine temperature gauge ) has lit up
I was looking at the 2001 Ford Windstar Owner Guide and the warning light : above the tachometer is the check fuel cap light below the engine temperature gauge in the middle is the bulb warning light , one of the exterior bulbs has burned out
On a 1999 Ford Windstar : The warning light ( that looks like an engine ) located above your engine temperature gauge is the " CHECK ENGINE " warning light . It comes on if something is effecting the engine emission controls . If it stays on , drive it into a professional or if it starts flashing that means an engine cylinder misfire has been detected and you need to avoid any heavy acceleration or deceleration until you have it repaired
generally speaking the warning light is to catch y0ur attention if you are not looking at the gauges. check the symbol on the warning light and check the corresponding gauge. as they work together, for example if the oil warning light comes on that means the oil pressure is dangerously low and the oil pressure gauge will register little or no oil pressure also.
On a 2001 Ford Windstar : That warning light means that one of your exterior bulbs has burned out ( the warning light between the door ajar warning light and the low engine coolant warning light , located in the lower right area of your gauge cluster )
On a 1998 Ford Explorer ( like my 1995 ) Either your engine coolant temperature is too high , your engine oil pressure is too low , or your fuel gauge is at or near empty ( any of those 3 things will turn on the " check gage " warning light )
On a 2001 Ford Windstar : The warning light in the low right corner of your gauge cluster is the ( low washer fluid warning light ) * according to a drawing in the owners manual *
It means the engine may be overheating.
One of the exterior bulbs doesn't work ( if you mean the warning light in the bottom right side of your gauge cluster )