The refrigerant then flows through to the compressor, which pumps the refrigerant to the condensor as a vapour before it turns into a liquid again.
Although air-conditioning is an energy-intensive process, and increases the amount of fuel a car uses, modern systems are efficient.
Many drivers believe that air-con can only be used to cool the car, and therefore use it only during the warmer months of the year.
In fact not using the air-con at least once a week can harm it, because the refrigerant acts as a lubricant for the system’s seals and gaskets.
So we recommend switching on the air-con and turning up the heat on a regular basis during the winter - the dehumidified air generated by air-con is also excellent for clearing steamed-up windows.
Air-con not working?
Over time the refrigerant can leak from the system and needs to be topped up or entirely replaced. Your local garage should be able to check the car’s system’s pressure and refill it.
However, it’s important to make sure there aren’t any leaks from seals, gaskets or the compressor itself before it’s refilled, or you’ll be wasting your money.