Replacing a radiator hose is crucial for maintaining the cooling system's efficiency and preventing engine overheating. Begin by ensuring your car has cooled down, then drain the radiator and remove the old hose and clamps. Install the new hose, tighten the clamps, and refill the radiator with the recommended coolant mixture. Finally, start the car with the radiator cap open and run the heat to remove air bubbles, then secure the cap. Remember to replace the hose every four years or 60,000 miles and use the exact hose specified for your vehicle to ensure proper fit and function.