The cooling system uses coolant, usually a mixture of antifreeze and water, to remove heat produced by the engine. The cooling system needs to be flushed to remove debris that could lower its efficiency. A cooling system coolant change is needed to prevent debris from clogging the radiator.
Usually, the cooling system should be flushed every second year or every 30,000 miles, depending upon the manufacturer's recommendations. Also, some manufacturers may specify a particular type of coolant to use. Be sure to follow all manufacturer recommendations when flushing the cooling system.
To perform a coolant system coolant change, the technician removes the drain plugs in the radiator and engine block allowing coolant to exit. After all coolant has left the engine and the radiator, the plugs are reinstalled and fresh coolant is put into the radiator and coolant expansion tank. Then the air is removed from the cooling system. Once the cooling system is full, the technician starts the engine and lets it run until normal operating temperatures are reached. Then they allow the cooling system to cool down, the fluid is checked and more fluid is added if necessary.
Since a cooling system coolant change is part of the regular maintenance of a vehicle, you would be best advised to follow the factory recommended vehicle maintenance schedule for how frequently a cooling system flush is required. This factory recommendation must be adhered by to maintain the validity of your new car warranty and extended auto warranty, if applied. If mechanical breakdown occurs due to the lack of your car's maintenance of the coolant, the warranty would not cover the car repair.