acura cl 2.3 1999. ac works great at night. but during the day when over 75 degrees outside it hardly works. i do have a slow leak

 

could just be low on refrigerant, condenser is excessively dirty, compressor is going out

find and fix the leak, the valve cores tend to be the number 1 leak location, adding some refrigerant with uv dye and using a leak detector kit of glasses and uv light and run the ac for a bit at night, then check in the dark