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You probably have a faulty temp blend door motor assembly on the front unit. It is located directly behind the radio, way back in on the front of the heater case.

Could also be the door inside behind that assembly is broken. The door lifts to allow hot air and drops to close to send cold air. I am in the process of fixing mine and it aint pretty, but cheaper to get the assembly than to replace the door which requires the whole assembly to be replaced. Lots of luck with it.

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โˆ™ 2015-07-16 13:54:59
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Q: What would cause a 1999 Windstar heater to blow hot air in the back but not in the front?
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This "flap" is the temperature blend door which directs air over & through the heater core.The "Related Questions" below are intended to help explain some of the basics of Windstar heating/cooling functions and terminology.That should help in the investigation of the specific problem on the vehicle, and ultimately leading to a fix.Start with the "Where is the heater control valve located on a Ford Windstar" question and then move on to the "What could cause a Windstar to have no heat - or not be able to adjust the temperature"

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Not a whole of symptoms to work with here...The most common cause of "... heater not working..." is a failed temperature blend door actuator motor.See "Related Questions" below for more

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