10 days ago my car started heating up in slow traffic, I just though aux fan issues since the heat sensor on the radiator was not triggering the high speed, today I removed the hole cooling system, cleaned the radiator fins and it was a chance to replace the spark plugs, belts and visco clutch, I also removed the thermostat to check if the system is cooling fine.

I ran the car with AC on, aux fan worked fine, but it overheated within 20min, if I hit the accelerator to make the fan cool the radiator, it cools back to the middle.

I would have 2 doubts, either the radiator has some blocked areas, or bad head gasket.

what are your recommendations guys?