by 
Tegarst
ANSWERS: 5
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When you select floor, vent, etc. do you hear a sound of the vents changing? If not, then you may have a vacuum line problem. Cheap, easy to fix. The vacuum line responsible for changing the vent position is probably compromised, so there's not enough pressure to take it off defrost. Like I said, cheap, quick, and easy to fix in most cases. Edit: Who rated this down, and why? I answered the question with an idea, as requested. If you're going to downrate have the balls to leave a comment.
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geek860 is exactly right! I had the exact problem. The vaccum line that runs across the manifold was dried out and cracked. about a fifteen minute repair with the right tools.
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go to the auto part store and get the same diameter hoses it's a 3$ fix get a sissors and replace the lines that are very vissible under wiper blade and blower section on the left side and you should have air flow on any dessired vent good luck
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You need to remove the center console & the engine cover in order to access the main vaccum line that is right in front of the PCV valve on the driver's side of the engine. Make sure you have a really long flat head screw driver to remove the two slotted bolts on the engine cover on the firewall. Also, since the placement of the vacuum hose is definitely a design flaw as it cannot stand up to the heat of the engine for more than a few years without degrading the line, make sure you invest in a heat shield wrap or another larger vacuum hose to engulf the replacement hose & to act as a heat shield. I recommend replacing all of your AC vacuum hoses at the same time because everyone I just checked on my 2002 Astro van were on their last leg. For $8 in hoses it is totally worth it.
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You need to remove the center console & the engine cover in order to access the main vaccum line that is right in front of the PCV valve on the driver's side of the engine. Make sure you have a really long flat head screw driver to remove the two slotted bolts on the engine cover on the firewall. Also, since the placement of the vacuum hose is definitely a design flaw as it cannot stand up to the heat of the engine for more than a few years without degrading the line, make sure you invest in a heat shield wrap or another larger vacuum hose to engulf the replacement hose & to act as a heat shield. I recommend replacing all of your AC vacuum hoses at the same time because everyone I just checked on my 2002 Astro van were on their last leg. For $8 in hoses it is totally worth it.
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