The first step is identifying the specific problem with the radiator. Common issues include leaks, clogs, corrosion, and damage to the fins. A visual inspection, pressure test, and checking for coolant leaks are typical diagnostic steps. Before working on the radiator, the coolant needs to be drained. This is usually done by opening the radiator drain plug or removing the lower radiator hose. Proper disposal of the coolant is essential for environmental reasons. Depending on the issue, the radiator might need to be removed from the vehicle. This can involve disconnecting hoses, electrical connections, and any mounting brackets. If the radiator is clogged or corroded, it might need to be cleaned. This can be done using specialized radiator cleaning solutions or by flushing the radiator with water.