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You have confirmed the 2 primary culprits:

  • The heater core is clear - checked by feeling the heater hoses and both are hot (the coolant flows through the core at all times

  • The temperature blend door actuator motor is turning and operating the temperature blend door *shaft*
One thing I would focus on next is that the temperature blend door itself is moving - not just the shaft, but the whole thing. These have been known to break.

See "Related Questions" below for more about the door.
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Q: Blend door actuator and heater core on a ford windstar works why are you still getting cold air?
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Blend door actuator and heater core on 99 ford windstar works why are you still getting cold air?

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