1992 lexus es300 overheating issue only when A/C is on.

Hello to the forum, I am having an issue with my 92 es300, i have already have changed the thermo fan switch,thermostat,radiator flush,temp sending unit, it is driving me crazy because it does not overheat at all when the A/C is not on,ONLY when the A/C is on is when it starts to overheat, maybe an issue with the A/C system somehow??????? If anyone has had the same issue please or one close to it, please give me some input. thanks to all that help.

ok i am going to replace the head gaskets and the water pump, also i am going to take the radiator out and have it flushed by a professional at central radiator so that they can dip it into the tank and rod and reel it.

Yeap looks like it was the radiator that was clogged up, just changed the rad and put another one and put the new headgaskets and it is 100% ready to ride anywere.

i had to do the same with mine. hope it doesn't happen again