In the desert

Arivukanru ,a Japanese, and a British were lost in
the desert. They were driving around in a Jeep when it broke down, because they
had nothing else they decided to each take a piece of the Jeep as they continued
their journey. The Japanese took the radiator, the British took the seat, and
Arivukanru took the door.
After a while of walking the British asked the Japanese "I'm confused, why did
you bring the radiator?" The Japanese responded, "If I get thirsty, can drink
the fluid."
Next the Arivukanru asked the British "Why did you bring the seat?"
So the British said "If I get tired, I am not going to sit on the sand. I can sit
on this comfortable seat."
Finally the Japanese asked Arivukanru why he had chosen the door.
Arivukanru quickly responded to this question, "Well, when it gets hot all I
have to do is roll down the window.