Condition
AC Not Cooling After Filter Change
Cooling did not improve after replacing the filter. Suggests refrigerant, coil, or electrical fault.
Possible Causes
Low Refrigerant Levels
A leak in the refrigerant lines prevents the system from absorbing heat efficiently.
Root Cause Analysis →Diagnostic Tests
- Check subcooling/superheat
- Leak test with nitrogen
- Pressure test
Repair Options
Dirty Evaporator Coils
Dust buildup on the coils restricts airflow and stops heat absorption.
Root Cause Analysis →Diagnostic Tests
- Inspect coil surface
- Measure temperature delta
- Check airflow
Repair Options
Blown Start Capacitor
The capacitor provides the electrical 'kick' needed to start the compressor; without it, the motor won't turn.
Root Cause Analysis →Diagnostic Tests
- Measure microfarads
- Check for bulging
- Test under load
Repair Options