The switch is a possibility. I would wait for a hot day when the A/C isn't working right and see if the compressor is operating properly. If the clutch is engaging like normal but, you are noticing it not being cool enough in the car, then it is an issue with the gas either being to high or low in the system. Mine does this when I run the compressor for to long in hot conditions. I recently fixed my leak but, I know I either under or over charged the system for the trial run.