Spring is the time most people discover their car air conditioning is not working properly — usually on the first warm day of the year when they reach for the button and get a blast of warm air instead of cool. The good news is that in most cases this is not a fault. It is simply a system that has not been maintained.
Why Does Air Conditioning Lose Its Effectiveness?
Car air conditioning systems use a refrigerant gas (typically R134a in older vehicles, or R1234yf in cars made after 2017) to cool the air. This gas is held under pressure in a sealed system, but even a perfectly healthy system loses around 10–15% of its refrigerant every year through natural permeation — tiny amounts seeping through seals and hoses over time. After two years, the system can have lost enough refrigerant that it struggles to cool effectively. After three or four years without a recharge, many systems stop cooling altogether.
This is why manufacturers and air conditioning specialists recommend a recharge every two years, regardless of whether the system appears to be working. It is maintenance, not a repair.
What Happens During an AC Recharge?
An air conditioning recharge (sometimes called a re-gas) involves connecting your car to a specialist machine that recovers any remaining refrigerant, checks the system for leaks, pulls a vacuum to remove any moisture, and then refills the system to the correct pressure with fresh refrigerant and lubricant oil.
The whole process takes around 45 minutes to an hour. It is not something you can do at home — the equipment costs thousands of pounds and the refrigerant gases are regulated under environmental legislation. You need a qualified technician with the right equipment.
Signs Your Air Conditioning Needs Attention
The most obvious sign is that the air coming from the vents is not as cold as it used to be, or is not cold at all. Other signs include: the system taking a long time to cool the cabin; a musty or unpleasant smell when you switch the AC on (which suggests bacteria or mould in the system); or the compressor making unusual noises when the AC is engaged.
If you notice a musty smell, you may also need an AC system clean and antibacterial treatment in addition to a recharge. This is a separate service that cleans the evaporator and kills any bacteria or mould that has built up inside the system.
Does Air Conditioning Affect Fuel Economy?
Yes — running your air conditioning increases fuel consumption, typically by around 5–10% depending on the vehicle and conditions. A system that is low on refrigerant has to work harder to achieve the same cooling effect, which means the compressor runs for longer and uses more fuel. A properly recharged system is more efficient and will save you money at the pump over time.
The Best Time to Get It Done
Spring is the ideal time to get your air conditioning recharged — before the hot weather arrives and before the garages get busy with the summer rush. Getting it done in March or April means you are ready for the first warm day, and you are not waiting in a queue in July when everyone else has the same idea.
AC Recharge at AVS Bransgore
We offer air conditioning recharge and service at AVS Bransgore using the latest equipment, suitable for both R134a and R1234yf systems. We serve customers across Christchurch, Bransgore, Ringwood, New Milton, and the wider New Forest area. Call us on 01425 200826 to book, or visit our air conditioning service page for more information.
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