There are hose quick-disconnect which shut off the liquid as you dis-connect them:
yeah i know that, but every time you disconnect and reconnect your most likely going to get air in you lines and you'll loose some liquid because it "will" leak out when it is disconnected. Then your going to need 2 rads. one at home the other at school, or onboard the pc. And then those fittings are going to restrict your flow bad...Its just a pain, and thats why most people don't do it.
but lets say he did do it. he would have to adjust his OC as the temprature changes day to night, and even day to day. Thats just silly... also he cant use biscut fans on the rad for still air days because they are not designed for all weather like morning due, rain, snow, dust.