I have a 2006 Honda Civic coupe manual transmission with 97k on it. My A/C will not blow cold air when at idle or stopped at a stop sign,Traffic light,etc. It will blow ice cold air once the car goes about 2k rpm's or higher and continues to work great. As soon as you come up on a light and you shift in to neutral and coast the RPM's drop like a rock and the car tries to die and has a hard time to keep idle and blows warm/cool air but not cold. I know the compressor cycles on and off to save fuel and i understand that and i notice it only at speeds over 50 mph. I have also tried down shifting instead of coasting and it does no good. The Ac coolant has been checked 3 times and is full and has no leaks. I'm thinking it might be a 02 sensor,A/C pressure switch,idle needs to be adjusted,alternator? I also have friends with Honda's and the same car and year model and their car's a/c works just great. I have a brand new battery and a good alternator. I took it to one A/C shop and they said it was the compressor which is B.S.