There is one other possible solution, assuming the fan is actually still operating as you say it sounds like.
Under the hood in back, near where the blower motor is, you'll see either one or two vacuum operated valves (plastic vacuum line/lines run to them, the quantity depend on the year). What this/these operate is a fresh air flap on the cover assembly. If you put the car into recirculation mode, this flap closes.
What can happen is that the connectors on the end of the vacuum valve/s can break and allow the air the blower is pulling through to snap the door shut. If this happens, with the AC NOT in recirculate mode, you now have both the fresh air flap closed (due to the broken connector) and the recirculation flap closed (due to the mode that it's in).
Operate the AC like normal, and when it does this to you again, hit the recirculation button and see if you then get airflow.
You may even hear the fresh air flap drop back down after the pressure is relieved.
I have seen a few of these, the connectors are available seperately, cheap date.
Actually, if this is the cause, the reason cycling the key makes a difference is that you are shutting the blower off by doing that and the door opens itself up. You can leave the car running and shut the whole climate control off and achieve the same effect, it'll work again until the blower picks up speed and maybe a hit a little bump in the road and "WHUMP" no airflow again, except in recirc mode. MAN I was scratching my head awhile on the first one of these I saw! Blower motor noisier than heck, but sounded like it was really straining to work, but no airflow. Sound familiar?
ps My experience with the evap temp sensor is that on longer trips, it will blow OK, but start blowing warm air. This really sounds like a blower related problems as noted above, a blower or more likely the regulator, except that the original poster makes it really sound like this flap problem because they can hear the blower running. The frozen evaporator? Well, maybe, except the poster says it's still drippping water, the dripping really starts to slow down when it's frozen. Could be though.
Last edited by Gilly; 09-06-2002 at 11:54 PM.