The procedure to remove and install hoses will require that you first remove the radiator cap and empty the radiator of its coolant either by opening the petcock or removing the lower radiator hose. Draining ethylene glycol antifreeze into a container with a cap is essential in order to avoid the risk of injuring pets since the compound is toxic. When changing bottom hose, empty all the coolant; when changing top hose, empty just enough to reduce the amount of fluid. Slide and loosen hose clamps towards the middle of the hose then disconnect, in case needed, in a twisting motion. The clamps should be placed approximately 2 inches on both ends and tight when installing a new hose so that it does not crush the metal on the radiator connections. Once the petcock is closed, add coolant, and briefly run the engine to verify the presence of leaks. In the RX-7 models, the coolant flows just like in normal engines and the upper hose must be partially drained whereas the lower hose must be fully drained. Never drain the engine when it is hot, and never upset the radiator cap. When removable the tower hose is undergoing removal, the splash panel should be removed first. Install the RX-7 the same way, but make sure the clamps are not tightened too tightly so as to break. Following any refitting of the panels, start the engine and make sure that there is no leakage and fill up the radiator accordingly. In a car, old hoses can be kept in a plastic bag to be accessed in time of need.