What are the symptoms of a faulty car air conditioning pressure sensor?
3 Answers
When the car air conditioning temperature sensor is damaged, frequent starting may occur. Here is relevant information: According to the measurement method, it can be divided into two categories: contact and non-contact. Based on sensor materials and electronic component characteristics, it can be classified into thermal resistors and thermocouples. The working principle of the air conditioning temperature sensor is: thermal resistance temperature sensors are divided into metal thermal resistors and semiconductor thermistors. Temperature control is managed by a microprocessor (CPU). The failure rate of the temperature sensing element (temperature sensor) is relatively high in control circuits, and faults such as open circuits, short circuits, or poor characteristic curves may occur.
When the car's air conditioning pressure sensor fails, common symptoms include the AC blowing warm air instead of cold, a constant feeling of hot air blowing in your face, and sometimes the fan not spinning or making louder noises. As someone who frequently repairs cars, I've encountered many owners complaining about poor cooling performance, describing long drives with the AC on as feeling like being in a sauna. Additionally, warning lights on the dashboard may illuminate, such as the engine light or AC fault indicator. Some vehicles may even enter a protective mode and shut down automatically to prevent compressor damage. If left unrepaired for a long time, it could affect the system's circulation, leading to refrigerant leaks or compressor burnout, and fuel consumption may also increase. It's advisable to visit a professional shop as soon as these signs appear, using a diagnostic tool to read the codes and confirm whether it's a sensor issue. Don't wait until winter to regret not fixing it in the summer.
I remember when my car's air conditioning had issues last time, the symptoms were particularly obvious: pressing the AC button got no response, occasionally it would start but stop shortly after, the cold air would suddenly turn hot, leaving me sweating on the highway. The interior temperature gauge showed normal readings, but the actual feeling was terrible. A small yellow light also popped up on the dashboard, and I later found out it was a pressure sensor failure. This issue not only affected comfort but also made me easily irritable and distracted during traffic jams or long drives, which was unsafe. I took it in for repairs immediately, and the mechanic said the sensor controls the refrigerant pressure—if the readings are wrong, the system automatically shuts down as a protective measure. It's important to pay attention to AC usage habits, get regular check-ups to prevent small problems from becoming big ones, and not skimp on repair costs for the sake of convenience.
