Cold air that barely moves is a different problem from warm air. The refrigerant side can be fine while something is blocking or slowing the air itself.
Likely causes
- Clogged cabin filter. Dust in Gulf conditions clogs filters quickly, and airflow drops across every speed.
- Failing blower motor. If only the highest fan speed works, the blower resistor is a common culprit. A squealing or rattling sound points to the motor itself.
- Blocked or collapsed ducts. Less common, but leaves, debris or a loose duct can limit the flow to the vents.
- Iced-up evaporator. If airflow starts strong and then fades, the coil may be freezing. Low refrigerant or a faulty sensor can cause this.
A quick test at home
Set the fan to each speed in turn and listen. Note which speeds work and whether the sound changes. Then check the cabin filter, which is usually behind the glovebox. Tell the technician what you noticed, because it speeds up the diagnosis.
Do not ignore it
Weak airflow makes the compressor work harder and can leave the cabin foggy in humid weather. A short check is cheaper than a repair later.