What Causes Hot Air to Blow from Car Vents?
2 Answers
It is actually normal for hot air to blow from the car's air conditioning vents even when the air conditioning is not turned on while driving. This happens because the air intake for the air conditioning system comes from the engine. When the engine is running, heat is carried by the air to the vents. The car's heating system operates on this principle, which is why warm air may still come out even when the air conditioning is off. Below is some related information about car air conditioning: 1. Introduction: The car air conditioning device (air-conditioning-device), commonly referred to as car air conditioning. 2. Function: It is used to adjust and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to optimal conditions, providing a comfortable environment for passengers and reducing travel fatigue. It also creates good working conditions for the driver and plays an important role in ensuring safe driving as a ventilation device.
I've encountered this issue several times and found it quite annoying. The most common reason for hot air blowing from the vents is a problem with the AC system, such as a refrigerant leak or insufficient refrigerant, which prevents cooling. Another possibility is that the temperature control module might be faulty and unable to regulate the mix of hot and cold air. Additionally, if the blend door is stuck, it may continuously direct air through the heater core. While driving, engine heat can sometimes seep into the air ducts, especially during summer when ground temperatures are high. If the temperature knob is set incorrectly or the AC cooling mode isn't activated, this can also happen. For troubleshooting, I first check whether the fan is working and if the cabin air filter is dirty—sometimes a simple fix can resolve the issue. If I can't handle it myself, I take it to a repair shop immediately, as driving in excessive heat can be distracting and affect safety. Regular AC maintenance can prevent such problems, saving both money and hassle.
