My toyota rav 4 is overheating iit is boiling from the reservoirtank what can i do l have changed the radiator and the thermostat checked all the hoses but it is still boiling can you help me please

Check fan operation. It should come on at approximately 102 degrees celcius.Which fan drive do you have? The older RAV 4 has a hydraulically driven fan while the later models have an electric fan. Both are "turned on by the computer". So check for the thermo sensor at the coolant outlet from the engine. As it gets toward boiling point you should find a lowered resistance of approximately 200 - 300 Ohms there. When cold these sensors run in excess of 2500 Ohms.On the older models with the hydraulic drive it is provided with hydraulic pressure from a pump in the transmission. Check for transmission fluid level and pump operation by loosening off the supply hose and starting the engine in neutral. If the pump is inoperative no oil will be supplied to the hydraulic fan motor. Happy hunting.