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Remove the radiator cap then open the petcock on the lower radiator. You shouldn't need to remove it completely, just twist it until coolant starts to flow.

Never remove the radiator cap when the car is hot. Wait until the radiator and engine is cool to the touch.

If you plan on re-using the engine coolant, be sure to use a clean drain pan. You should never re-use dirty or discolored fluids.

You do not need to drain the system completely of coolant. You will be replacing the upper radiator hose only so as long as the fluid level is below that it is ok.