I have a 1996 Chrysler Concord and my air conditioner works good for the first 45 minutes or so. That is when it starts to get warmer and fog comes from the vents. The fog goes away if I switch to recirculate but the air still isn’t cool enough. On my car I have a thermostat to set the temperature that adjusts fan speed and settings like the recirculate button and I would like the air to work using this feature. Do I just need a charge or something worse. Thanks for all of your help.
I suspect everything is working normally. That hot humid air from the outside is being cooled below it’s dew point and it becomes fog. You might try setting the fan on high from the start.
Possible malfunctions include freezing coils (may be a problem with the refrigerant charge) or a blocked drain so the condensation is building up.
The fog would also make me suspect a blocked drain.
I suggest you take your car to a shop that specializes in automotive AC systems. They have the equipment and knowledge to correctly diagnose and repair your cars AC.