Yesterday, my 2004 TJ overheated on me. I turned it off and waited until it cooled down and drive home with the heater on. Super fun in 100+ degree heat wave. When I got home I popped the hood again and let it run without the ac on and it did great keeping the temp constant. Then I turned on the AC and after a few minutes watched the gauge start climbing. I also noticed a whirling noise only when the AC is on. The AC still runs super cold. Last year I replaced the radiator, hoses, heater hoses, water pump, fan clutch, thermostat, belt, idler pulley, and tensioner. As far as I know the AC system is all original with around 100k miles in the Arizona heat. How do I troubleshoot from here?