A/C problem: cooled air won't come out after long driving
Our Taurus 2001 gives us another challenge after we fixed the fan speed problem.<see The Ford Taurus 2001 Fan speed control knob malfunction>, hopefully there are not related.
Here is what happened, the A/C works fine in local driving(less than 30minutes or less speed), but when we drive it out of town for more than about an hour of trip, the A/C air-outlets will behave like blocking air to come out, and no matter what we switch among the A/C settings(off,A/C,Max A/C or any setting on it) or change the fan speeds, the air just won't come out from the air exits anymore. While I changed the fan speed, i can hear the cooled air was circulated inside of the air-ducts, but just don't feel the cooled air. It looks like something is blocking the air outlets, maybe some duct vent control or the like.
Since every time we sent it to a repair shop, we were not driving long enough, so we did not have the situation of no air out to show them, hence they had never found problem on our Taurus 2001 A/C system, so any suggestion? Thank you!