Yikes! So yesterday was the first day that I was officially cold enough to turn on the heat in my 2000 Explorer Eddie Bauer, V6, 4.0L, SOHC. I've checked my fluids and they are good. What should I be looking for? I've been told about some kind of "door" but nobody knows what it's called. I've also been told to look at a valve that you can access via the glove box. I do not have any fluids spraying all over the inside of my truck, so I think the core is probably not clogged. The air blows perfectly fine, it just blows COLD. And it's almost November in Missouri, so I'm going to be needing my heat.