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AC Making Strange Noises
in Garland, TX
Your AC should hum steadily in the background. When it starts banging, squealing, or grinding, a mechanical part is in trouble. Garland's extreme summer heat pushes systems hard for months at a time, and parts that were already worn tend to fail during the hottest weeks. Ignoring the noise usually means a bigger, more involved repair later.
Quick Answer
Unusual AC sounds in Garland homes usually mean a part is loose, worn, or failing. Banging points to something broken inside the unit. Squealing means a bearing or belt is going. Rattling is often debris or a loose panel. Call (361) 338-5229 when noises are new or getting louder, because running a failing part to death makes the repair bigger.
Telltale Signs
Warning Signs to Watch For
- Loud banging or clanking when the unit starts or runs
- High-pitched squealing from the outdoor unit
- Rattling from the indoor air handler or ductwork
- Grinding sound that gets worse over time
- Clicking that continues after the system starts up
- Hissing or bubbling from the refrigerant lines
Root Causes
What Causes AC Making Strange Noises?
Loose or Broken Blower Wheel
The blower wheel spins inside the air handler to push air through the house. If the wheel comes loose or a blade breaks off, it bangs against the housing every rotation. Summer heat in Garland makes the metal components expand and contract daily, and over several years that loosens the hub bolt.
The Fix
Blower Wheel Repair or Replacement
The technician secures a loose wheel or replaces a cracked one. Once the wheel runs true, the banging stops and airflow returns to normal.
Worn Contactor or Capacitor
The contactor is a switch that sends power to the compressor and fan motors. When it wears out, it clicks or chatters instead of closing cleanly. Garland's voltage fluctuations during peak summer demand on the Oncor grid stress contactors and capacitors faster than in milder climates.
The Fix
Contactor or Capacitor Replacement
These are inexpensive electrical parts that a technician can swap out in under an hour. Replacing them before they fail completely prevents the compressor from being damaged by inconsistent power.
Debris Inside the Outdoor Unit
Leaves, twigs, and hail fragments can fall into the outdoor condenser unit through the top grille. Once inside, they hit the spinning fan blade and cause rattling or banging. Spring storms across Garland regularly blow debris into units, especially in yards without cover over the condenser.
The Fix
Outdoor Unit Cleaning and Inspection
The technician removes the top grille, clears all debris, and checks the fan blade for bends or cracks. A bent blade gets balanced or replaced so the fan runs without vibration.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Loose or Broken Blower Wheel | Worn Contactor or Capacitor | Debris Inside the Outdoor Unit |
|---|---|---|---|
| Banging sound starts the moment the fan turns on | |||
| Clicking continues for more than 5 seconds after startup | |||
| Rattling only from the outdoor unit | |||
| Grinding or squealing from the air handler inside | |||
| Unit hums but compressor does not start |
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