In a modern engine, only around one third of the heat produced during combustion is converted into mechanical energy to drive the vehicle. The rest is dissipated mainly by the exhaust system and through the cooling system.

The cooling system removes around one third of this heat by circulating coolant through the engine. (Coolant is a mixture of water and a special liquid concentrate that helps to inhibit corrosion forming in the engine.) Heat is removed by the radiator which uses air to cool the coolant.

The other important function of the cooling system is to keep the engine operating at a constant temperature at which peak operating efficiency is achieved.

Most modern systems are pressurized to raise the boiling point of the coolant so EXTREME CAUTION should be exercised when carrying out maintenance, as serious scalding could result. DO NOT REMOVE THE RADIATOR CAP WHILE THE ENGINE/COOLING SYSTEM IS HOT.

· Have your cooling system checked every year and serviced every 2 years
· Perth is a hot dusty climate and many engine failures can be attributed tp neglect of the cooling system and could be easily avoided
· Check the schedule in your owner’s manual for changing the coolant and the correct type of coolant required.
· Check the coolant level every week. Your owners handbook will outline the correct method.

If you are topping up the coolant level, there is a problem. bring your vehicle to TT Auto Services as soon as possible. A simple fault may turn into a major engine repair if left unattended.
Most importantly, keep your eye on the temperature gauge. Pull over when the temperature rises above the normal indicator, not when the car stars to run rough or stalls. If this occurs, it’s usually too late and an expensive engine repair may be needed.
To be able to get engines to run at peak efficiency, engine designers need to be able to control the minimum operating temperature, this is controlled by the thermostat.
The thermostat acts like a valve restricting coolant flow when the engine is cold, allowing the engine to reach operating temperature quickly. As the temperature of the engine increases so does the coolant flow.