Overheating

I recently had the head gasket done. Since then I have had problems with overheating. The radiator cracked as a result and had to be replaced. I changed the radiator fan switch and removed the thermostat. This is an ongoing problem and gets worse when the car is idling in peak traffic with temperature gauge reaching over 100. This morning I started with the radiator full of water. After 7km, I topped up 1.5 litre. After a further 5km, I topped up 2litres of water. Even with the overheating, I do not get any hot air inside the car. When the temperature reaches over 90 degrees, the water comes through the radiator cap. The car can travel a maximum of 20km when there is no peak traffic. If switched off when the temperature reached 100, it will not start again for at least a hour. I topped the radiator, left the cap open and started the engine. After a few seconds, the water drained into the engine