Why Is My AC Not Cooling? Common Problems & Solutions
Nothing is more frustrating than switching on your air conditioner during Karachi’s heat — and realizing it’s not cooling properly. Whether you have a split AC, window AC, or ductable system, there are a few common reasons your AC may stop cooling.
At Air Fix Masters Karachi, we handle these issues daily. Here’s a quick guide on why your AC is not cooling and what solutions work best.
✅ 1. Low or Leaking AC Gas
One of the most frequent problems in Karachi is AC gas leakage. Over time, refrigerant levels drop, reducing your AC’s cooling performance.
Signs:
- AC blows normal air, not cold
- Ice builds up on indoor pipes
- Long cooling time
Solution:
✅ A certified technician will check gas pressure, fix leaks, and do a proper AC gas refill.
✅ 2. Dirty Filters & Coils
Dust buildup in Karachi’s environment clogs filters and evaporator coils quickly, choking airflow and reducing cooling.
Signs:
- Weak airflow
- Dust smell from AC
- AC trips frequently
Solution:
✅ Regular AC maintenance service to clean filters, indoor coils, and outdoor condenser units.
✅ 3. Faulty or Weak Capacitor
A weak capacitor prevents the AC compressor or fan motor from starting, reducing cooling or stopping it completely.
Signs:
- AC turns on but no cooling
- AC outdoor unit not running
- Humming sound but fan not rotating
Solution:
✅ AC technicians can diagnose capacitor issues and replace faulty components on-site.
✅ 4. Thermostat or Remote Issues
Sometimes, incorrect thermostat settings or faulty remotes cause cooling problems.
Signs:
- AC only blows fan air
- AC doesn’t reach set temperature
- Unresponsive remote
Solution:
✅ Reset thermostat settings or replace faulty remotes; our technicians can help you recalibrate controls.
✅ 5. Outdoor Unit Problems
Blocked or malfunctioning outdoor units can’t expel heat, causing low cooling.
Signs:
- Outdoor fan not working
- Loud noises from outdoor unit
- No airflow from indoor unit
Solution:
✅ Technicians clean outdoor units, repair fan motors, and ensure heat dissipation for effective cooling.
✅ 6. Incorrect AC Capacity for Room Size
An under-capacity AC struggles to cool large rooms, especially during Karachi’s high temperatures.
Signs:
- Room stays warm despite running AC
- AC works continuously without cooling
Solution:
✅ Consider upgrading to the correct AC tonnage based on your room size.
✅ Summary of Quick Solutions
| Issue | Solution |
|---|---|
| Low gas | Gas refill + leak repair |
| Dirty filters/coils | Deep AC cleaning & maintenance |
| Faulty capacitor | Replace capacitor |
| Remote/thermostat | Reset or replace remote |
| Outdoor unit fault | Clean/repair outdoor unit |
| Undersized AC | Install correct AC size |
✅ Book Professional AC Repair in Karachi
At Air Fix Masters, we provide same-day AC repair and maintenance services across DHA, Clifton, Gulshan, Bahria Town, PECHS, and all Karachi areas.
✅ Certified Technicians
✅ Transparent Pricing
✅ Guaranteed Cooling Improvement
Final Tip:
Don’t wait for your AC to completely stop — regular maintenance keeps cooling smooth, reduces energy bills, and prevents major breakdowns.