The A/C in my 2007 Dodge Grand Caravan has stopped working. It was not all at once however. The driver side stopped working then started working fine after several days. The same happened with the passenger side as well. The D/C motors under the dash are working. The system has a full charge of refrigerant and the compressor kicks in. Fuses and relays are good. Now the A/C will not work in any of the zones.The blower motor and heater is fine. I took it in for repair and they disassembled the dash and were unable to find the problem. Any thoughts?