Quick TakeawayGradually weakening AC performance often points to a refrigerant leak rather than a mechanical failure. Here's how to recognize the pattern.
- Cooling that's noticeably weaker than it used to be, but not completely absent
- Performance that's fine at first, then fades after 10–15 minutes of driving
- Cooling that's worse in slow traffic than at highway speed
- A slightly sweet or chemical smell near the vents
- O-ring seals at hose and component connections, which can degrade over time
- Condenser damage, sometimes from road debris impact
- Evaporator corrosion, less common but possible over years of use
- Compressor shaft seals, which can wear gradually
- UV dye testing: a fluorescent dye is added to the system and circulated, then a UV light is used to spot where it's escaping
- Electronic leak detectors: sensors that detect refrigerant molecules in the air near suspected leak points
- Pressure decay testing: monitoring how quickly system pressure drops over time
- Car AC Compressor Failing? Early Signs — related AC diagnostics
- Car AC Not Cooling Properly? Common Causes — broader troubleshooting
- Car AC Gas Refill in Abu Dhabi — service explanation
- Cabin Air Filters and AC Performance — airflow-related cooling issues
- Preparing Your Car for Abu Dhabi's Summer Heat — seasonal AC maintenance
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