How Often Should You Service Your Car's Air Conditioning?
How Often Should You Service Your Car's Air Conditioning?
Air conditioning is one of those systems that's easy to take for granted — until it stops working properly. Unlike an oil change or an MOT, there's no fixed legal requirement to service your AC, which means it's often overlooked entirely. Here's what actually happens to your air conditioning over time, and how often it should be checked.
Why AC Systems Lose Performance Even Without a Fault
Air conditioning systems naturally lose a small amount of refrigerant every year — typically around 10-15% — simply through tiny amounts of permeation through hoses and seals. This isn't a leak in the traditional sense, but the cumulative effect over two to three years is enough to noticeably reduce cooling performance, even if nothing has actually gone wrong with the system.
This is why a car's air conditioning can feel less effective each summer, gradually enough that it's easy to put down to the weather rather than the system itself.
The Recommended Service Interval
As a general guide, most manufacturers recommend an air conditioning service, including a re-gas, every two years. This helps to:
- Restore refrigerant to the correct level for optimal cooling.
- Identify small leaks before they become bigger, more expensive problems.
- Keep the compressor lubricated, as refrigerant carries the oil that protects it — running low can accelerate compressor wear.
Sticking to this interval is generally more cost-effective than waiting until the system fails completely, at which point a full diagnostic and repair is likely to cost significantly more than routine maintenance.
Signs Your AC Needs Attention Sooner
You don't always need to wait for a scheduled interval. Look out for:
- Noticeably weaker cooling compared to previous summers.
- A musty or unpleasant smell when the AC is switched on.
- Longer time taken to cool the cabin down.
- Unusual noises when the system is running.
Any of these are worth having checked regardless of when the system was last serviced.
The Knock-On Effects of Neglecting AC Servicing
A neglected air conditioning system doesn't just mean a warmer cabin. Reduced refrigerant can accelerate compressor wear, leading to a much larger repair bill down the line. Stagnant moisture and bacteria buildup within the system can also cause unpleasant odours, and in some cases, allergy-like symptoms for sensitive occupants — something we'll cover in more detail in our next guide on AC hygiene.
Keep Your Cool with Regular Servicing
Air conditioning is easy to forget about until it fails, but a simple two-yearly check can keep your system running efficiently and avoid costly repairs. Our aftersales team in Wisbech can check refrigerant levels, test for leaks, and re-gas your system as part of a routine service.
Book a service with JS Holmes today and keep your air conditioning performing at its best, whatever the season.