Tech arrived at a service call. Upon inspection the filter was very dirty and was obstructing airflow. This was causing the indoor coil to freeze. The filter was removed. The capacitor was checked and was out of tolerance. This item was replaced. The ice dethawed. There was a smell around the outside system and in the garage. The customer and tech searched for the smell but was unsuccessful. The smell dissipated once the compressor dethawed. The customer was informed of recommendations today. The system was functioning upon departure.