What Are the Reasons Why a Car's Air Conditioning Is Not as Cold as Before?
1 Answers
There are several reasons why a car's air conditioning may not be as cold as before, including insufficient refrigerant or a leak, excessive pressure in the air conditioning system, a damaged evaporator temperature sensor, or a faulty pressure switch. Below are some explanations regarding car air conditioning: 1. Insufficient refrigerant or a leak: In most cases, the lack of cooling is due to insufficient refrigerant. You can first check the air conditioning pressure. If both the high and low pressures are low, it is likely a refrigerant shortage. Simply add refrigerant until the pressure is appropriate. 2. Excessive pressure in the air conditioning system: The car's air conditioning system operates under pressure due to the compressor. If too much refrigerant is added or there is a blockage in the pipes, the system pressure may become too high. In this case, the control system will disconnect the compressor's electromagnetic clutch, causing the compressor to shut down. The solution is simple: after confirming that the pressure exceeds the standard, release some refrigerant to restore normal pressure. 3. Damaged evaporator temperature sensor or pressure switch: The evaporator, also known as the evaporator box, is located in the air duct under the dashboard. Here, the refrigerant vaporizes and absorbs heat, producing low temperatures. When air flows through the narrow channels in the evaporator, it is cooled. The compressor stops when the temperature approaches the frost point. If this sensor is damaged and frequently gives false alarms about approaching the frost point, the compressor will shut down frequently.
