Prevent Costly Breakdowns and Potential Engine Damage
The Basics:
Cooling system protects against damage keeping the engine
operating within the correct temperature range. The cooling system
includes the radiator, water pump, hoses, fan, heater, thermostat,
engine block, and heads. Anti-freeze provides a minimal amount of
protection against rust, scale, and other forms of corrosion. If your
vehicle is overdue for maintenance, the deposits may be building up.
Corrosion causes the radiator to rot out, as well as the engine block
and heads.
The Solution: 
Changing the coolant doesn't simply mean draining the radiator and
refilling it. Doing so would leave at least half the coolant (the
portion in the other components) and other rust and impurities. A
complete coolant flush requires a complete backflushing of the entire
system, and then adding new coolant. Regular cooling system maintenance
checks are recomended and help to prevent the possiblity of breakdowns
and expensive repairs. Coolant lasts about 2 years or 45,000 km. After
thatperiod of time, a complete coolant flush and change is recomended.
If you are having problems with your coolant system, please make an
appointment to have your vehicle serviced.