By All American HVAC | Altadena & Pasadena | 626.736.0962
When your air conditioner suddenly stops cooling—especially during a hot Pasadena afternoon—it’s more than uncomfortable. It can quickly turn into an urgent problem. The good news is that many cooling issues have common causes, and some can even be identified before calling a technician.
In this guide, we’ll walk through the most common reasons your AC isn’t cooling, what you can check yourself, and when it’s time to call All American HVAC at 626.736.0962 for fast, reliable service in Altadena and Pasadena.
🌡️ 1. Dirty or Clogged Air Filter
One of the most overlooked causes of poor cooling is a dirty air filter. When airflow is restricted, your system can’t circulate cool air effectively.
Signs:
- Weak airflow from vents
- Rooms not cooling evenly
- System running longer than usual
Fix:
Replace your filter every 1–3 months, especially during peak summer use in Pasadena.
👉 If airflow doesn’t improve after changing the filter, call 626.736.0962 for a system inspection.
🧊 2. Frozen Evaporator Coil
If your AC is running but not cooling, a frozen evaporator coil could be the issue. This often happens due to restricted airflow or low refrigerant levels.
Signs:
- Ice buildup on the unit
- Warm air blowing from vents
- AC constantly running
Fix:
Turn off your AC and allow it to thaw. Then check your air filter.
⚠️ If the problem returns, you likely need professional repair—call All American HVAC at 626.736.0962.
🔧 3. Low Refrigerant Levels
Your AC relies on refrigerant to cool air. If levels are low, your system simply can’t do its job.
Signs:
- AC blowing warm or slightly cool air
- Hissing or bubbling noises
- Ice on refrigerant lines
Fix:
This is not a DIY repair. A licensed technician must locate leaks and recharge the system.
📞 For fast refrigerant diagnostics in Altadena or Pasadena, call 626.736.0962.
⚡ 4. Thermostat Issues
Sometimes the issue isn’t your AC—it’s your thermostat.
Signs:
- Incorrect temperature readings
- AC not turning on or off properly
- System short cycling
Fix:
- Check settings (cool mode, correct temp)
- Replace batteries
- Recalibrate or upgrade if outdated
🌬️ 5. Dirty Condenser Coils (Outdoor Unit)
Your outdoor unit releases heat. When it’s covered in dirt or debris, heat can’t escape—so your home won’t cool.
Signs:
- AC running but not lowering temperature
- Higher energy bills
- Outdoor unit visibly dirty
Fix:
Gently clean around the unit and remove debris. Avoid using high pressure.
👉 For a full cleaning and tune-up, call All American HVAC at 626.736.0962.
🔌 6. Electrical or Capacitor Problems
Your AC depends on electrical components to start and run properly. If one fails, cooling stops.
Signs:
- Clicking sounds
- AC won’t start
- Intermittent cooling
Fix:
Electrical issues should always be handled by professionals for safety.
🏠 7. Ductwork Leaks or Blockages
Even if your AC is working perfectly, damaged ducts can prevent cool air from reaching your rooms.
Signs:
- Hot and cold spots in your home
- Weak airflow in certain rooms
- Rising energy bills
Fix:
A professional inspection can identify leaks or blockages and restore airflow.
🚨 When to Call a Professional
If you’ve tried basic troubleshooting and your AC still isn’t cooling, it’s time to bring in an expert. Delaying repairs can lead to bigger—and more expensive—problems.
At All American HVAC, we provide fast, honest service for homeowners throughout Altadena and Pasadena.
👉 Call 626.736.0962 today for same-day AC repair.
🌞 Keep Your Pasadena Home Cool All Summer
Air conditioning problems don’t fix themselves—but catching them early can save you time, money, and stress. Whether it’s a simple fix or a major repair, having a trusted local HVAC team makes all the difference.
If your AC isn’t cooling like it should, don’t wait.
📞 Call All American HVAC at 626.736.0962 and get your comfort back today.