Condition
AC Not Cooling in Extreme Heat
System struggles or fails to cool during peak summer temperatures. May indicate low charge or undersized system.
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
Severely Clogged Air Filter
A dirty filter restricts airflow, putting strain on the blower motor and reducing efficiency.
Root Cause Analysis →Diagnostic Tests
- Remove filter and test
- Check static pressure
- Inspect for light pass-through
Repair Options