As temperatures rise across the UK, stepping into a hot car can quickly become uncomfortable, especially if your air conditioning isn’t performing as it should.

If your AC feels weak, smells unpleasant, or isn’t cooling effectively, the good news is that many common issues can be improved or fixed without a trip to the garage. With the right approach and products, you can restore performance yourself.

Explore our full range of car air conditioning maintenance products to keep your AC running efficiently all summer.

Why Car Air Conditioning Struggles in Warm Weather

Hot weather places extra demand on your vehicle’s air conditioning system. Over time, this can highlight underlying issues such as:

• Low refrigerant levels
• Small leaks in the system
• Bacteria and mould build-up
• Reduced airflow

These problems often lead to poor cooling performance, unpleasant odours, or warm air blowing from the vents.

How to Improve Your Car’s Air Conditioning

1. Clean Your AC System

If your air conditioning produces a musty or unpleasant smell, bacteria and mould inside the system are usually the cause.

Using a product like Granville G+Pro Professional Aircon System Cleaner can help:

• Eliminate bacteria and odours
• Improve airflow
• Restore clean air circulation

How to use:

1. Start the engine and set the air conditioning to maximum
2. Switch airflow to recirculation mode
3. Place the cleaner in the footwell
4. Activate the product and close all doors
5. Allow it to circulate for 10–15 minutes

2. Recharge the Air Conditioning System

If your air conditioning is no longer as cold as it used to be, low refrigerant is a common cause.

The Digital Recharge Trigger and Gauge - R134a Refrigerant allows you to:

• Check system pressure
• Recharge refrigerant accurately
• Restore cooling performance

How to recharge:

1. Locate the low-pressure port under the bonnet
2. Attach the recharge gauge
3. Start the engine and set AC to maximum
4. Monitor the pressure and refill as needed

3. Address Minor Leaks Early

If your system loses performance shortly after recharging, a small leak may be present.

The Elke R134a Leak Stop Treatment is designed to:

• Seal minor internal leaks
• Maintain system pressure
• Help prevent more expensive repairs

When to use:

• Cooling performance drops again after recharge
• You suspect gradual refrigerant loss

Top Tips for Keeping Your Car Cool in Warm Weather

Even with a fully working AC system, these simple steps can improve comfort:

• Open doors or windows briefly before driving to release trapped heat
• Park in shaded areas whenever possible
• Use recirculation mode to retain cool air
• Allow the system to stabilise before increasing fan speed
• Replace or clean your cabin air filter regularly

Common Mistakes to Avoid

• Ignoring unpleasant smells from the system
• Overfilling refrigerant, which can damage components
• Only using air conditioning occasionally instead of regularly
• Delaying repairs when performance drops

When to Use DIY Solutions and When to Seek Help

DIY is suitable for:

• Cleaning the system
• Recharging refrigerant
• Treating minor leaks

Professional assistance is recommended if:

• The system does not work at all
• You hear unusual noises
• There is a significant or persistent leak
• The compressor may be faulty
  
  

Frequently Asked Questions

How often should I maintain my car’s air conditioning system?

It’s recommended to clean and service your car’s AC at least once a year, ideally before the summer months, to ensure optimal cooling and prevent odours.

Can I recharge my car AC myself?

Yes, using a product like the Digital Recharge Trigger and Gauge – R134a Refrigerant allows you to safely check pressure and refill refrigerant. Always follow instructions carefully and avoid overfilling.

How can I tell if my car AC has a leak?

Signs of a leak include weak cooling, hissing noises, or refrigerant loss shortly after a recharge. Products like Elke R134a Leak Stop Treatment can help address minor leaks, but professional inspection is recommended for larger issues.

Final Thoughts

Maintaining your car’s air conditioning system during warmer months does not need to be complicated or costly.

By cleaning the system, maintaining refrigerant levels, and addressing minor issues early, you can ensure reliable performance and a more comfortable driving experience throughout the summer.

FIXRA provides a range of trusted products to help you maintain your vehicle and stay prepared for changing conditions.