To solve this you have to take it to a AC Service Shop. It has the Evaporater clogged. It needs to be cleaned. By time to time it takes in all the dirt of the rug and the opening and closing the doors just adds to it. They will check the fan motor first but usually its just clogged.To clean it, they will have to take it out,save the Freon for it to be used again etc. to do a good job.I'll bet my bottom dollar since I'm a Certified AC Tech.