Car Air Conditioning Not Working? Here's What to Check

Few things are more uncomfortable than air conditioning that blows warm air during a heatwave — especially stuck in traffic on the M4 or the IDR. If your car's A/C is not performing, several common causes could be responsible. Here is what to check before booking a professional inspection at /services/air-conditioning.

Low refrigerant gas — the most common cause

Your air conditioning system relies on refrigerant gas (R134a on older cars, R1234yf on newer models) to absorb heat from the cabin. Small leaks develop over time through seals and joints, reducing cooling performance gradually until the system blows warm. A regas at Pickwell Autohub restores the correct refrigerant level and includes a basic leak check. We recommend recharging every two years even if cooling seems acceptable.

The cabin filter is clogged

A blocked pollen or cabin filter restricts airflow, making it feel as though the A/C is weak even when the refrigerant level is fine. If air volume from the vents has dropped, the filter may need replacing — a straightforward job during a service at /services/full-service.

Compressor or electrical faults

The compressor pressurises the refrigerant. If the compressor clutch is not engaging, you may hear no click when the A/C is switched on, and the system will not cool. Electrical faults, blown fuses, or a faulty pressure switch can also prevent operation. Our diagnostics team at /services/diagnostics investigates these issues with proper equipment rather than guesswork.

Condenser damage

The condenser sits at the front of the car behind the grille, dissipating heat from the refrigerant. Stone chips, road debris, and corrosion can damage it, causing leaks or poor heat exchange. You may notice cooling works at low speeds but fails at motorway speeds when airflow is higher.

When to book a professional A/C service

If your A/C has not been serviced in two years, blows warm air, makes unusual noises, or produces a musty smell, book an air conditioning service at /services/air-conditioning. Our Reading garages handle R134a and R1234yf systems, perform leak detection, and diagnose compressor faults. Prices start from £49 for a regas.

Book in Reading

Pickwell Autohub serves drivers across Reading, Earley, Woodley, and Berkshire from our RG1 and RG2 branches. Book at /booking in around sixty seconds, or call +44 (0) 7828112600. Do not endure another summer with ineffective cooling — a regas takes one to two hours and makes an immediate difference.