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I will assume the ac is still getting cold, just not blowing. You wouldn't really know unless you pulled the panel and checked the lines. Causes include the blower motor, resistor, fuse, or switch.
It sounds like your AC unit could be overheating or even damaged.
AC units have a sensor that will turn them off automatically to prevent damage from overheating. If there is an insufficient amount of air flow, the unit will heat up, and then eventually turn off.
When the car is moving, more air is forced over the unit, likely keeping it cool enough to run, however, when the car come to a stop, it loses that air flow, and quickly heats up. Thus, the AC would work while the vehicle is in motion, and overheat and stop when the car is stopped and idling.
However, the AC unit could be completely blown. The cold air while moving could be just a case of air being forced into the car. Think of a house fan, the fast the wind blows on you, the cooler it gets.... Thus, it could be an illusion that the AC is working when car is in motion, when it really isn't.
Check the coolant sensors. One sensor, when coolant is overheated, cuts the ac off, this sensor may be stuck electrically open, only two wires going to it. Other sensor has four wires, two for temp gage and two for engine management.
2004 mercury mountaineer.heat problem When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.
Cooling fans working? If you notice the air getting warm mostly while stopped, probaby cooling fans not turning on. if the fans are working properly, may be low on freon and need a recharge.
Your AC is low on refrigerant; The AC compressor needs a minimum amount of regrigerant to run. If and when it does run (while low on refrigerant) the air coming out of the vents will not be cold. The refrigerant you require is R-134A and is available over the counter but if you are the least bit unsure as to how to add refrigerant, taking it to a garage that does AC recharging would be your best play. If you want to try to add refrigerant on your own you will need the following, 1LB can of R-134A, an AC hose adapter to deliver the refrigerant, and preferably an AC pressure guage to ensure you are not overfilling the AC line which will damage the system.
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