I havea 98 Expedition EB. I've searched until my figers hurt but can't find a (solid) answer. My AC works fine, I know this because it blows nice cold air from the front vents. But as soon as I engage the rear blower, it blows nothing but hot air. The other day it was above 90 and my wife and I were fine in the front with the AC on and I would have loved to have turned on the rear blowers for my small children in the back but they would have roasted.
Does it sound like a blend door issue? And if so, how do I get to it? I'm pretty handy around the car so I have no qualms about tearing into it.
Any help would be most appreciated. Thanks in advance.

malmond