My 2010 Fit was blowing warm air with the AC on, so I added refrigerant and checked the pressures with gauges. It now blows very cold air, but I notice that the compressor clutch quickly cycles, something like on 10 seconds, off for 5 seconds, etc. I don't recall it doing that before, even when the AC was working OK. Sounds like maybe I have the incorrect amount of refrigerant in the system now. Is there a table showing what the normal high/low side pressures should be for a given ambient temperature? And should I be making these pressure measurements at a certain engine RPM?