I think you are correct that this issue is a wider issue with our Chevrolet Spark's air conditioning systems. My a/c is only blowing cold air when I am driving. When my car is at idle, the air stops cooling the car. I have been told that the GM engineers are working on this issue and I have an active case number so that my dealership will get the information to repair it, when the resolution is found. It has been a long hot summer, in West Tennessee.
Same here. I can hear the A/C compressor clutch disengage when at idle, then it kicks in once you get moving. Not sure if this is by design, but you have to turn the temp to max cool and recirculate on to keep the car comfortable in 90' weather.