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I have a 98 with the manual AC controls. The temp **** works, the fan speed works, but the vent position switch doesn't it blows thru all the opening no matter where I turn it.
I had the same problem on my 98, but with the electronic controls. Mine was due to the little vacuum line on the back of the intake manifold being disconnected. I had to pull the manifold to get back there to reconnect it, but it's worked perfectly ever since. I don't know if the manually-controlled A/C has the same setup, but you might want to take a look. Kind of a PITA, but not particularly difficult to fix. Good luck!