Why is the car air conditioning pipe cold but the air outlet not cold?
3 Answers
Car air conditioning air outlet is not cold because the fuse has been burned out or the air outlet switch is not connected properly, resulting in a short circuit. The following is relevant information: 1. Car air conditioning: Car air conditioning refers to the air conditioning device installed in the car, which can cool, heat, ventilate and purify the air in the compartment, providing a comfortable riding environment for passengers, reducing the driver's fatigue and improving driving safety. 2. Composition: Car air conditioning generally includes refrigeration devices, heating devices and ventilation devices. This combined device makes full use of the limited space inside the car, with a simple structure and easy operation, and is currently the internationally popular modern car air conditioning system.
The AC pipe feels cold but no cool air comes out from the vents. I've encountered this several times. Usually, it's because the evaporator is frozen and blocking airflow, especially when the AC runs too long in summer or the temperature is set too low, causing condensation to freeze on the evaporator surface. Another possibility is a faulty blower—either the fan isn't spinning or it's too slow to push cool air through. In my case, the filter was too dirty, with dust buildup restricting airflow, and replacing it fixed the issue. I recommend avoiding constant max-cool mode; try opening windows occasionally to prevent evaporator freeze-ups. If airflow suddenly stops cooling, pull over to check immediately to avoid compressor damage. Annual AC system cleaning can prevent this issue, saving repair hassle and time.
It's quite common for the air vents to not blow cold air while the pipes remain cool. The main things to check are evaporator freezing or air duct blockage. When the AC is running, the evaporator temperature drops. High air humidity or excessive refrigerant can cause it to freeze, blocking airflow. It could also be due to worn blower motor or loose connectors causing insufficient fan speed. I've observed similar cases before, and it turned out to be slight refrigerant leakage reducing efficiency. Checking the blower is simple: start the car and listen for whooshing air sounds; if silent, there might be electrical issues. Dirty filters also need timely replacement, located beside the glove compartment. Delayed repairs can damage other components. It's recommended to use professional gauges to measure refrigerant pressure for accurate diagnosis and to avoid misjudgment.
