Why aircon needs servicing even when it still feels cold
A car air conditioning system loses roughly 10% of its refrigerant each year through seals and pipework. Performance drops gradually, so drivers rarely notice until the system stops cooling properly on the first hot day of the year.
Refrigerant also carries the lubricating oil around the system. Once the level falls, the compressor can run dry — turning a £60 service into a compressor replacement costing several hundred pounds.
Signs your aircon needs attention
- Cooling that feels weak, or takes a long time to chill the cabin
- A musty smell when it is switched on, usually bacteria in the evaporator
- The system cycling on and off rapidly
- Visible refrigerant leaks or oily residue around pipes and joints
- The windscreen clearing slowly in winter, when it should clear almost instantly
What a proper service includes
A good aircon service is not just a top-up. It should include:
- Recovery and measurement of the existing refrigerant, so leaks are spotted
- A vacuum test to confirm the system holds pressure
- Recharge with the correct refrigerant and oil for your vehicle
- A leak dye test if the pressure drops
- An antibacterial clean of the evaporator, which is where the smell comes from
Vehicles using the newer R1234yf refrigerant have a slightly higher recharge cost than older R134a systems.
Running aircon in winter
Aircon dehumidifies as well as cools, so it clears misted windows faster and keeps seals lubricated. Using it for ten minutes a week through winter, with the heating on, is the cheapest way to avoid a spring repair bill.
Booking an aircon service in Sheffield
Ask whether the garage charges for refrigerant recovered versus refrigerant added, and whether a leak test is included in the price.