The most common cause of radiator leaks is leaky hoses, but you can have leaks in the radiator itself, too. Which can be a bigger problem.
*Rusty Radiator.
*Bad Water Pump or Thermostat.
How we fix it?
As the radiator goes bad, it will turn a rusty or oil color from contaminants. If not flushed periodically, this dirty coolant turns into sludge. By the time it turn to sludge, it will not flow properly to cool the engine efficiently and may end up with extensive damage to the engine and transmission.