I have a 2011 Honda Civic LX with about 70k miles on it. As of a few weeks ago the AC really started having cooling problems; however, this all seemed to happen gradually. It seems to get a bit colder if the engine is revved but at idle on max AC you can barely tell that it's on. I can see the compressor engaging with no hesitation and staying on. The blower fan seems to be normal, putting out the usual amount of air. The condenser fan turns on. If I touch the low pressure AC tubing it seems very cold. It doesn't seem to matter how long the AC is running it usually stays the same temperature unless the RPM increases. Things I have tried: I have checked the pressure of the refrigerant on the low tubing and it seemed normal. I added a few psi of freon out of desperation with no change. This does not seem normal for a four year old car. After some research I did see people having similar problems but none as specific as mine. I am not sure where else to start looking.

Let me know if more info is needed. Any help would be greatly appreciated. If the ECO mode is engaged on a Honda Civic the A/C won't be seriously cold. The Eco mode adjusts the A/C, the engine and transmission for maximum fuel economy. Disengage the ECO mode and A/C gets nice and chilly even at city speed. I own a 2012 Civic LX with 140,000km (87,000 miles) with no A/C issues whatsoever. The A/C system on a Honda Civic uses only .75Kg(1.65 lbs) of refrigerant. Overcharging the system will damage the compressor. A/C systems specify not only what type of refrigerant and how much. My brother had the same problem with he's 2012 Nissan sunny (versa) all those you mentioned is been done until I found out that the Temperature selector cable is loose so this means its stocked and its no longer select from heating or cooling so maybe yours is on heating still because the cable is loose it wont go back to cooling, it doesn't matter what's the Temperature selector showing from outside because the cable is loose and always mixing cold and heat at the same time, so see if your is not loose for the sunny air conditioning unit was manual I am not sure if your Auto maybe its different , I hope this helps.