1. Low Refrigerant Charge (Most Common Cause)
AC systems lose ~5–10% refrigerant per year.
Facts
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Low refrigerant = low pressure
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Low pressure prevents compressor activation
2. Failing Compressor
The compressor circulates refrigerant.
Failure Signs
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Clicking noise
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AC clutch not engaging
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Metal shavings in refrigerant
3. Condenser Blockage
The condenser dissipates heat.
When Blocked
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Temperature difference decreases
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Refrigerant cannot cool down
4. Cabin Air Filter Blockage
Restricts airflow.
Facts
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Reduces cooling by 20–40%
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Filters should be changed every 15,000–20,000 km
5. Expansion Valve or Orifice Tube Failure
Controls refrigerant flow into evaporator.
Conclusion
AC failure is caused by refrigerant loss, compressor issues, or airflow restriction.
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