I have a 2006 kia sportage lx v6. Live in florida. When I stop at a light or am sitting in a drive thru, my ac starts blowing warm, when I start driving again the ac returns to cold. I've placed a thermometer in the vent and when cold registers between 30-35F. My mechanic has replace the engine thermostat and the radiator thermostat. Freon is fully charged. compressor is working fine. My mechanic can't find anything wrong but suggested a thermostat inside the dash MAY be the problem which requires the removal of the dash to replace it but there is no gaurantee this will fix the problem. Please, any suggestions or ideas would be appreciated.