A refrigerant leak is the number-one reason a car’s A/C stops cooling. Because refrigerant is a gas, leaks aren’t always obvious — but there are telltale signs. Here are five to watch for.
1. Cooling that fades over time
If your A/C used to blow ice-cold but has gradually gotten weaker over weeks or months, a slow leak is a prime suspect. As the refrigerant level drops, cooling performance drops with it.
2. A hissing sound
A hissing or bubbling noise from the A/C system — especially shortly after you shut the car off — can be the sound of refrigerant escaping through a leak.
3. Oily residue near A/C components
Refrigerant travels with a special oil that lubricates the system. When it leaks, it can leave a greasy, oily film around fittings, hoses, or the compressor. A visible residue is a strong clue.
4. The A/C clutch short-cycling
If refrigerant is low, the compressor clutch may rapidly click on and off instead of running steadily. It’s the system trying — and struggling — to maintain pressure.
5. You’ve already topped it up once
If your A/C needed refrigerant not long ago and it’s weak again, that’s not a coincidence — it’s a leak. Refrigerant doesn’t deplete on its own, so needing repeated top-ups means it’s escaping somewhere.
Why leaks need proper repair
Topping up a leaking system just sends more refrigerant into the atmosphere and leaves you back where you started. We use proper leak-detection methods to find the source, then fix it — so the repair actually holds. See our air conditioning service for what’s included.
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