Hi everyone. Just soliciting inputs in case you guys do experience the same thing. My FJ40's Radiator Extension (Reservoir) runs out of water after everytime I get to travel between 20 to 30 miles. There is no leak in both the Radiator nor in the Reservoir tanks. There are also no leak coming from the Radiator cap, Upper and Lower Hose and Water pump. However, at the middle of each transit i notice that the water inside the Reservoir is boiling. It is only when I make a full stop that I see water starts to emit thru the Reservoir cover. Though when I remove the Radiator cap when it is no longer hot, the Radiator is still full of water. I experience the same thing when i get to start the engine and have the engine run stationary from 5 to 10 mins. Hot water is also emiting from the Reservoir cap. What and where would you think the problem of my FJ's cooling system? I didn't experience overheating of the Radiator yet. Admittedly, under the hood is just so hot that I normally use rags to open it. Would appreciate any input. Thanks.