Air Conditioning Servicing and Regassing
Vehicle air conditioning is frequently ignored until it stops working, at which point the repair is considerably more expensive than the maintenance would have been.
Why systems lose gas
Refrigerant escapes slowly through hoses and seals as a normal characteristic of the system, commonly cited at several percent annually.
As the charge falls, cooling performance degrades gradually enough that drivers adapt without noticing until a hot day.
Low refrigerant also means low oil circulation, since the lubricant travels with the gas. That is what causes compressor failure, which is the expensive outcome.
Regassing
The service evacuates the remaining refrigerant, vacuum-tests for leaks, and recharges to the specified weight with the correct oil.
A proper service includes the vacuum test. A shop that simply adds gas without testing is treating a symptom and the gas will leak out again.
Manufacturers commonly suggest servicing every two years or so, though intervals vary.
Refrigerant types
Older vehicles use R134a. Newer ones use R1234yf, which is considerably more expensive and requires different equipment.
This is why regassing costs vary so much between vehicles, and why some garages can only service one type.
Confirm which your vehicle uses before comparing prices, since quotes for the two are not comparable.
Running it year-round
The compressor has seals that dry out if unused, and the system circulates oil only when running.
Running the air conditioning briefly every few weeks through winter keeps seals lubricated and prevents leaks developing.
It also dehumidifies, which clears a misted windscreen considerably faster than heat alone — a practical benefit in cold weather.
Smells and cabin filters
A musty smell when the system starts indicates microbial growth on the evaporator, which is common where the system is used with recirculation and switched off immediately on arrival.
Running the fan without cooling for the last minute of a journey dries the evaporator and reduces it.
Antibacterial treatments address existing growth. Replacing the cabin filter at service intervals matters more than most owners realise and affects both smell and airflow.
When something is wrong
Cooling that is weak but present usually indicates low charge.
No cooling at all may be a failed compressor, a blockage, an electrical fault or a pressure switch preventing operation because the charge is too low.
Diagnosis before repair matters here, since simply adding gas to a system with a significant leak wastes the gas and does not fix anything.
A leak detection dye added during service helps locate persistent leaks at the next visit.
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