My 04 LT 5.3L starts to overheat when it sits at idle with the A/C on. The only thing I’ve done so far is I installed a dual electric fans that pull a lot more air than the stock manual fan but even with this it still climbs in temperature. The only thing that I have changed to the cooling system is the fans. I have changed the thermostat to a lower temperature thermostat but it will still climb in temperature. Any other ideas? Could my radiator be clogged up? If so how can I unclog it? Granted it is hot outside, today it was 103 but even so I see other cars next to mine running and not over heating. I’ve really gotta try and correct this problem quickly because I have a medical condition that I’m not supposed to be in the heat or I could have a seizure. It starts over heating while I’m waiting on my son and daughter to get out of school. Any idea will be greatly appreciated and there’s no dumb idea I just really need this fixed and I’m at a loss.