Flushing the cooling system on your car is not difficult, but it does take some time. Unfortunately without flushing, corrosion can increase inside the vehicle cooling system and lead to future costly repairs or even engine failure. Since a cooling system flush is rarely an emergency operation, pick a sunny day with moderate temperatures to do the job. With 5 years of mechanic experience, I have seen the damage done to radiators, heater cores, and other components over time because old coolant was left circulating too long.
Flushing helps to slow or prevent corrosion.
Car radiators and other parts do not get eaten by corrosion quickly. Once the coolant in your car starts to degrade, it can accelerate this decay. New coolant will not always clean everything away, but it will stop or slow the damage that may be in progress. Regular flushing every couple of years can keep radiator failure at bay.
Cleaning the radiator core will allow more efficient cooling.
While debris inside the radiator tends to fall to the bottom of the radiator, flushing will dislodge small pieces that can clog the area that is serviced by the cooling fan. This will let the coolant flow through the radiator without having portions of the unit being blocked.
Cleaning the heater core will help it to heat your car’s cabin better.
Since the heater core is basically a small radiator, the same thing that helps the radiator will improve circulation through the heater core. While the heater core does not do much of the cooling of the car, it does aid the radiator during the winter when the heater is in use. Since more of the heated fluid can make its way through the heater core, the heater should be able to do its job better in cold weather to keep you and your passengers warm and toasty.
Flushing will help keep the thermostat from sticking closed.
Residue build up on the thermostat can cause it to stick shut. If the thermostat will not open when your car needs it to, the engine will overheat. Although thermostats do not last forever, a good cooling system flush should serve to extend the life of this small but essential component.
Getting fresh cooling circulating throughout the system can help other components.
On some cars, the aluminum heads can be damaged in the same way as the radiator and heater core. Other items like the water pump can also benefit from the cleaning of a good cooling system flush. When you refill the coolant with the proper mixture, you are also making sure that your vehicle is weather proofed against your coolant freezing in the winter.