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If it's stuck in defrost your battery died and messed up the computer.
Disconnect battery for 5 or more min. It worked on my 96
I had the same problem with my '03 and discovered the selector knob was broken, replaced it and that fixed the problem.
Most likely the vacuum hose is disconnected or broken.Does your cruise control work?Check this out :http://www.jeepforum.com/forum/f9/fan-always-blows-defrost-selector-doesnt-work-830241/
If air blows from defroster only, the vacuum line to the blend door may be broken. You can access most of it under the hood.
The vacuum line that goes to the defroster is probably disconnected, possibly on the fire wall.
My ac blows only in the defroster and not any of the other vents i have 98 ford windstar 3.8 v6
Do you mean the defroster fan? If so yes if it blows the main engine circuit breaker in the fuse block.
Either you have a defective selector switch or the most likely is that you have a broken,cracked,or loose vacuum hose at the rear of the engine.
Very likely the starter is bad.
small vacuum hose in engine compartment is cracked
yes, it works just like the a/c, it just blows the air on the windsheild/windows
Faulty Function selector switch. Consider replacement.
Could this be 2 separate problems?Stuck in defrost modeNo heatSee "Related Questions" below for more about both