i have a 1999 toyota corolla AE111L-AEPDKW model
the head gasket was replace because of a heating problem, because of the age of the car, first i did replace the thermostat, i also replaced the three temperature sensors (gauge Coolant Water Temperature Sensor, Radiator Fan Temperature Switch Sensor, Car Coolant Temperature Sensor), and before the sensors replaced the gauge sensor showed that everything is ok, after the replacement the gauge show a heating problem.
after the replacement of the head gasket, the engine light came out with P0325 code (bad knock sensor), i ordered it from Aliexpress and it is on the way, so i still not replaced it.
I flashed the radiator and engine 3 times, when I had replaced the thermostat.
i checked out that there is no leaking of coolant and there is no leaking of coolant.
When the engine starts to strain a bit it already starts to warm up, and when the fan starts working it cools it down when I leave the accelerator pedal.
When I turned on the AC power the fan started working slowly.

what could be the problem? i suspected for a clogged radiator..