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Flushing Cooling Systems

Radiator Flush

The cooling system is designed to keep your engine from overheating. A water pump circulates coolant through the engine to transfer heat away from the combustion chamber, which then makes its way to the radiator. Once it has been cooled, it makes its way back into the engine.

Over time, the coolant can become contaminated by scale, rust and other debris which may damage sensitive cooling system components, and needs to be changed at certain intervals.

A cooling system flush removes this debris, and allows the system to be filled with fresh coolant and distilled water for maximum efficiency.

A cooling system flush, including replacement coolant.

How is a Cooling System Flush performed?

The mechanic will add a cooling system cleaner to the coolant, bring the car up to operating temperature to ensure the cleaner is evenly distributed throughout the whole system. The bottom radiator hose will then be removed to allow the coolant to be drained out. Once empty, the system will be flushed out with water from a hose to remove any remaining debris and cleaner and to check for blockages. The radiator hoses will be reinstalled, and a fresh mixture of coolant and distilled water will be added to the system.

  • Add cooling system cleaner to radiator
  • Start engine and allow to reach operating temperature
  • Remove bottom radiator hose and drain plug, drain old coolant
  • Flush system with water to remove any deposits
  • Refit radiator hose and drain plug
  • Refill with fresh coolant and distilled water
  • Bleed air out of the cooling system, inspect for leaks
  • Road test vehicle to ensure correct operation

Keep in Mind

  • Some newer vehicles are filled with ‘long-life’ coolant, which can last up to 10 years or 100,000km. Check in your owner’s manual if you are unsure what type of coolant your vehicle is equipped with, and the recommended intervals for replacement.
  • Many newer vehicles are fitted with low coolant level sensors, and will display a warning if the coolant level is low. If you see this light, having your cooling system inspected as soon as possible will help locate any problems with your vehicle.