Recharging Car AC System: Keep Your Car Cool This Summer 

Is your car's air conditioning struggling to keep things cool? Regular maintenance is key to ensuring your AC performs at its best, whether it’s recharging the system, identifying leaks or picking the correct refrigerant gas.

This guide covers everything you need to know to keep your air con running efficiently, from spotting the signs your car's AC is not working, to understanding the unique requirements of electric and hybrid vehicles. Stay comfortable and protect your vehicle by taking simple steps to maintain your car’s air conditioning system.

Does my air con need recharging?

If your car's air conditioning isn’t as cool as it used to be, it might be time to consider air-con regassing. This straightforward process involves removing the old refrigerant gas from your system and replacing it with fresh gas, restoring the cooling performance you rely on during warmer months.

One of the clearest signs that regassing is needed is when the air from your vents feels less cold or isn’t any cooler than when the AC is switched off. If you can’t recall the last time this service was done, it’s worth checking (and probably means it’s due for a recharge!)

How often to re-gas your car’s air con

It’s generally recommended to service and charge your car’s air conditioner system every two years to keep it running at peak performance; however, many drivers only address it when the air stops blowing cold.

Leaving it unchecked may lead to less efficient window demisting in winter and even higher fuel consumption, as the system works harder than necessary. Regular checks not only ensure optimal cooling but also help your car's AC run more efficiently, saving you fuel and maintaining comfort year-round. Staying on top of this routine service is a simple step that can prevent unnecessary hassles down the road.

How do I know what gas my car needs?

Knowing which refrigerant gas your car’s air conditioning system needs is essential for keeping it running smoothly and avoiding potential damage. Most cars use one of two refrigerants:

• R134a: Introduced in the 1990s, R134a was the standard refrigerant for most vehicles manufactured before 2013. However, due to its high Global Warming Potential (GWP), the EU banned its use in new car models starting from 2011. While older vehicles still rely on R134a, it is being phased out to reduce its environmental impact.

• R1234yf: Favoured in models from 2017 onwards due to its lower environmental impact. By 2025, it is expected that all cars will use R1234yf instead of R134a.

For cars made between 2013 and 2017, the gas type can vary, so it’s important to check. You can find out by consulting your vehicle handbook, checking under-bonnet labels or asking a qualified mechanic. Using the wrong gas could harm your AC system, so having it recharged at a trusted HiQ autocentre ensures the correct gas is used and any issues, such as leaks, are diagnosed early.

How to find an air con leak?

If the AC is not cooling in your car, a leak might be the culprit. Detecting a leak often begins with a visual inspection; look for signs like greasy stains or pooling under the vehicle where refrigerant might be escaping. If nothing is immediately visible, professional diagnostics like UV dye tests or electronic leak detectors can pinpoint the problem with accuracy.

Addressing leaks promptly is crucial, as escaping refrigerant not only reduces cooling efficiency but can also damage the system over time. The mechanics at your local HiQ centre will know how to recharge your car’s air con, ensuring comfort and efficiency on the road.

AC recharge for electric vehicles 

The air conditioning system in electric and hybrid vehicles operates quite differently from traditional cars, making it essential for comfort and vehicle health. Unlike internal combustion engine (ICE) vehicles, electric cars power their air conditioning directly from the battery, while hybrid systems draw energy from either the engine or the battery.

The process involves pressurising refrigerant gas, releasing heat, and cooling the cabin air, like how ICE vehicle systems work.

However, in EVs, air conditioning also plays a crucial role in thermal management, helping to regulate battery temperature during charging and extending battery life.

Given how vital the AC system is to overall performance, regular servicing and regassing are key to ensuring your electric or hybrid vehicle stays efficient, comfortable and in top condition.

FAQs

Can I recharge my air con myself?

It’s possible to recharge your car’s air conditioning yourself with DIY kits available, but it’s not always recommended. Without the right tools or expertise, you could misdiagnose issues, overcharge the system, or use the wrong refrigerant gas. Visiting a professional ensures the correct procedures are followed, protecting your AC system and your wallet.

How much does an air con recharge cost?

The cost of an air con recharge depends on your car type and the refrigerant needed. For electric or hybrid vehicles, the price might be slightly higher. Always check if the price includes checks for leaks or other system issues during the recharge.

What is the most common cause of a car’s AC not working?

The most common cause of a malfunctioning car AC is low refrigerant levels, often caused by a leak. Other typical issues include a faulty compressor, blown fuses, or clogged filters. Regular servicing helps identify and prevent these problems, keeping your AC system working efficiently.

How long does it take to put aircon gas in a car?

Recharging your car’s air conditioning with refrigerant gas typically takes between 30 and 60 minutes. This includes removing any remaining gas, refilling it to the correct level, and performing system checks to ensure everything is functioning properly. It’s a quick process at most autocentres.

Does a car service check the air con?

Standard car services don’t always include air conditioning checks, so it’s best to confirm beforehand. Many garages offer air-con servicing as an additional service. Regular inspection ensures the system runs efficiently, avoids leaks, and catches potential problems early.

Can a car AC lose refrigerant without a leak?

It’s unlikely. Refrigerant doesn’t get "used up" over time; it stays sealed in the system. If levels drop, there’s usually a leak. Addressing leaks quickly is critical to maintaining your AC’s performance and preventing further damage to the system.

If your air con hasn’t been checked recently or is showing signs of needing attention, don’t wait. Book an air conditioning recharge service with a trusted professional and enjoy the benefits of a well-maintained system.

For expert car care, find trusted local garages near you. Whether you need a routine check-up, brake repairs, wheel alignment, or a full service, our specialists ensure your vehicle stays roadworthy and ready for the road ahead.