Your cooling system works harder during hot temperatures to prevent overheating of the
engine. To keep the cooling system working effectively, the coolant and distilled water
mixture for a vehicle’s radiator should be 50:50. As a reminder, never open a hot radiator
cap when checking the coolant level in the reservoir.
As a rule of thumb, the coolant should be changed annually on most vehicles. This will
keep the cooling system fresh and clean inside, which helps prevent corrosion and assures
that the coolant has the proper boiling point and protection. A pressure test, thermostat
test, a cooling fan test and a visual inspection for leaks and corrosion should also be done
annually. Hoses and drive belts should be checked for cracks, bulges or frayed edges.
The radiator should be kept clean by periodically using a garden hose and a soft brush to
carefully remove bugs, dirt and debris.