Product Pulse 11 (Apr-Jun 2024)

12 AROUND THE WHEEL THERMAL

Getting technical with air conditioning mechanical parts

How does a vehicle aircon system work? 1. The compressor pressurises the gas, increasing its temperature. 2. The high-pressure gas then flows to the condenser (which acts as a heat exchanger). This heat exchange causes the gas to condense into a high-pressure liquid state. 3. Moving through the expansion valve, the gas experiences a pressure drop, leading to rapid expansion and a significant temperature decrease. 4. This cold and low-pressure refrigerant enters the evaporator, (another heat exchanger), absorbing heat from the surrounding air, resulting in the air cooling down. 5. The blower fan then circulates the cooled air into the vehicle’s interior.

GOOD TO KNOW

Common failures in a vehicle Aircon system resulting in a new units being required

Compressor issues

Issue

Reason

The clutch that engages the compressor can fail due to electrical issues, resulting in a lack of cooling.

Compressor Clutch Failure

Wear and tear, lack of lubrication, or internal component damage can lead to compressor mechanical failures.

Mechanical Failure

Moisture or debris entering the compressor can cause damage, such as corrosion or obstruction of internal components.

Refrigerant Contamination

Insufficient lubrication, high pressures, or poor airflow can cause the compressor to overheat, leading to damage.

Overheating

Faulty wiring or electrical component failures can prevent the compressor from operating effectively, resulting in a lack of cooling or intermittent operation.

Electrical Issues

Contaminants circulating within the system, such as metal particles or excess compressor oil, can damage the compressor.

System Contamination