text: show diagram of chevy lumina raditor?   what year ? what engine size ? , diagram will show nothing but a raidiator, top hose going to thermostat housing, lower hose going to water pump, burp line (over flow) hose goes to overflow tank and to raidiator just under the cap small hose, the overflow tank also has a small hose comming from it, it does not hook to anything its so when the tank over flows it comes out this hose to the ground, remember do not open cap if engine has been run and pressure has built up in the system, unless your a pro and no what too expect