Why is there no airflow from the heater?
2 Answers
The reasons for no airflow from the heater are: 1. When the air conditioner is heating in winter, it requires a preheating stage after startup. The outdoor unit works first, and the indoor unit starts blowing air only after the temperature of the indoor pipes rises. This is the air conditioner's cold air prevention function; 2. After running for a while, the outdoor unit needs to defrost, during which the indoor unit also stops working. Defrosting usually takes about 10 minutes. The correct way to use the heater is: First start the engine for preheating. When the engine temperature gauge pointer reaches the middle position, turn on the heater and set the air circulation to external circulation to expel the cold air from the car. After 2 to 3 minutes, set the air circulation to internal circulation. Notes: Do not aim the air vents directly at people, as this can more easily cause skin dryness; Secondly, it is recommended to half-open the window to allow some air circulation; A car humidifier can be used inside the vehicle.
I've been driving for over twenty years, and it's common to encounter issues with the heater not blowing air, mainly due to problems with the fan motor or air conditioning settings. If the fan motor is broken, it won't blow air—try turning on the air conditioner; if you don't hear the whooshing sound, the motor is likely stuck. Alternatively, the air conditioning might be set incorrectly, such as the knob being turned to defrost mode or the fan speed set to minimum, preventing warm air from coming out. Another possibility is blocked ventilation ducts, like a heavily dust-clogged air filter obstructing airflow. Last winter, my car had this issue, and it turned out to be insufficient coolant causing the heater core to malfunction—checking coolant levels is crucial. I recommend regularly cleaning the fan and filters during maintenance to avoid sudden breakdowns in the cold. If you encounter problems, don't panic—first, pull over safely and adjust the settings. If that doesn’t work, visit a professional auto repair shop. Safety comes first.
