no blend door in 1998 WS either, it's more like an open/closed door, it doesn't blend at all, just switches from top vents and bottom vents. It definitely sounds like low coolant to me, I've had this issue in both my 1998 and my 2002 windstars.
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1998 Ford Windstar GL 3.8L 253,100 miles
2005 Toyota Prius Package 6 1.5L 135,000 miles
2006 Toyota Sienna LE 3.3L 36,000 miles
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