Why Is There No Airflow When the Car Air Conditioner Heats?
2 Answers
The reasons why the car air conditioner does not produce airflow when heating include: 1. When the air conditioner heats in winter, there is a preheating stage after startup. The outdoor unit works first, and the indoor unit starts to blow air only after the temperature of the indoor pipeline begins to rise. This is because the air conditioner has an anti-cold air function; 2. If the outdoor unit of the air conditioner is frosted, it needs to be defrosted in time. During this stage, the indoor unit does not work. Defrosting usually takes about 10 minutes, and hot air will continue to blow out after defrosting is completed; 3. The components related to the air conditioner heating cannot work normally, and there are damages or malfunctions. The airflow of the car air conditioner is mainly generated by the blower, which introduces air into the car and circulates it through the air ducts inside the vehicle. The air ducts are equipped with damper structures, and the airflow volume of the air conditioner is adjusted by controlling the speed of the blower and the opening and closing of the dampers.
I encountered a similar issue last winter when my car's heater wouldn't blow any air at all. The cause could be a faulty blower motor or a blown fuse, preventing airflow. Another possibility is the blend door stuck in the cold position, blocking the hot air. At the time, I did a quick check of the settings to make sure the temperature was set to heat and the fan was on maximum, but there was no response. Eventually, I found out the blower relay had failed. Cleaning the cabin air filter can sometimes help too, as a clogged filter can restrict airflow. Driving without heat in extreme cold is dangerous—it can lead to frozen windows and fogging that impairs visibility. I recommend getting the fan system circuitry checked at a reliable repair shop as soon as possible, before things get worse. Regular maintenance of AC components can prevent such troubles.
