What Are the Reasons for Poor Cooling Effect in Sedans?

[London]

The reasons for poor cooling effect in sedan air conditioning include clogged air filters, poor heat dissipation of the condenser, dirty evaporator, insufficient refrigerant in the air compressor, and faults in certain components of the air conditioning system. Below are detailed explanations of common causes and solutions for poor cooling effect in sedan air conditioning: 1. Clogged air filter: The function of the air filter is to filter out impurities from the external air, such as dust and pollen. After prolonged operation, the filter will accumulate a thick layer of dirt. If not replaced or thoroughly cleaned, the airflow will be reduced, leading to poor cooling effect. It is recommended to replace or clean the filter during every car maintenance, especially in cities with poor air quality, where it should be changed twice a year. 2. Poor heat dissipation of the condenser: The condenser is located at the front of the car's engine compartment and is a tube coiled into a spiral shape. To dissipate heat quickly, it usually has many fins on the surface. If the fins are covered with oil stains, dead leaves, or mud, the heat dissipation effect will be compromised. Regular cleaning is necessary to prevent excessive heat buildup. If the condenser fan malfunctions, running too slowly or too fast, it will also reduce the condenser's efficiency. 3. Dirty evaporator: The symptom is a strong peculiar smell during the first half-minute after turning on the air conditioning, which disappears afterward. This is usually due to a dirty evaporator, which needs cleaning. If cleaning does not completely solve the problem, the evaporator may need replacement. 4. Insufficient refrigerant in the air compressor: If the air conditioning is not cooling, there is an 80% chance that the refrigerant has leaked. The leak point must be found, repaired, and the refrigerant refilled to resolve the issue. 5. Fault in a component of the air conditioning system: For example, a damaged compressor or expansion valve requires inspection and repair at a 4S shop.