An A/C that starts strong and fades is telling you something specific. Here is what it usually is.
The usual culprit: a low charge with a leak
An A/C system that cools for the first ten minutes and then goes warm is usually low on refrigerant — and refrigerant does not get used up, it escapes. Somewhere there is a leak: a worn O-ring, a corroded condenser, a chafed line. Topping it off without finding the leak buys you a few weeks at best. A proper service finds the leak with dye or an electronic sniffer, fixes it, then charges the system by weight.
Quick tips
- Cooling that fades with idling often points to the condenser fan
- A hissing sound after shutoff can be normal equalization — clicking is not
- If the compressor cycles rapidly, stop running the A/C until it is checked
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