Random idea towards battle mecha

In that ever so fluctuating nature of my brain fluttering across wikipedia, from Android Police, to the Tata Nano, to wing mirrors, to various car and hydraulic topics, something occurred to me…

What if we could combine some type of dual purpose fluid that could serve as both an effective coolant, and as a suitable hydraulic fluid, and use a set of tubing to work it into a system where moving helps provide the circulation of coolant, and develop some kind of nanotubes that can be contracted, by having a computer control the application of electric current…

Thus, big ass robot moves by shocking some hoses, that in turn pump coolant around. I can’t help but wonder, if engineers have already tried this, in a bit, something smaller than and less robot like than a Mackie, but still suitable to prove it can be done. Like wise, I can’t help but wonder if after a golden age in engineering, could we also achieve some kind of hydro-electric power generation around this, that can be kept going, and just require something like a battery assisted jump start?

I’ve always had a bit of an interest in figuring out how to make giant mecha actually work >_>.