Why Has the Car Air Conditioning Vent Output Decreased?

[VonAlana]

Here are the specific reasons for reduced airflow from car air conditioning vents: 1. Vent blockage or air leakage: If dashboard vents are blocked, clean them; if there's air leakage in the dashboard vent ducts, inspect and repair them, replacing if necessary. 2. Airflow direction control malfunction: If the airflow direction control motor is abnormal, inspect and repair the airflow direction control mechanism. 3. Blower motor failure: If the blower motor speed is low, inspect the wiring and the blower motor itself, replacing if needed; if the blower speed control module is faulty, replace it. 4. Air conditioning pipeline or control module failure: If the AC pipeline is frozen, replace the refrigerant with one meeting manufacturer standards or replace the expansion valve; if the AC control module is malfunctioning, inspect its wiring and replace the module if necessary.

[MacAlyssa]

I just solved the issue of reduced airflow from the AC vents last month. I remember one time while driving, the airflow felt extremely weak, barely enough for cooling. After inspection, I found the cabin air filter was clogged with dirt, so dusty that air couldn't even pass through properly. After replacing it with a new filter, the airflow improved significantly. Additionally, dirty blower fan blades or debris stuck between the blades can also reduce airflow. Another common cause is air leakage due to duct damage. You can try listening to the blower fan sound when turning on the AC - if the speed sounds slow without abnormal noise, it's likely a filter issue. Reduced vent airflow doesn't just affect comfort, but also makes the AC consume more power. I recommend checking and replacing the filter every six months, don't wait until summer heat arrives to rush for repairs.

[McSara]

I have experience with weakened air conditioning vents after prolonged car use, mainly due to malfunctions in the air delivery system. Possible causes include clogged air filters obstructing airflow, aging blower motors reducing rotation speed, or loose pipe connections causing air leakage. If you're inclined to DIY, start by removing the AC filter to check if it's darkened and needs replacement; then listen for smooth blower operation. These aren't overly complex issues - with decent mechanical skills you can handle them yourself, saving money and hassle. Weak vents also compromise defogging functionality, creating higher safety risks during rainy driving if left unrepaired. Regular cleaning can prevent major troubles.

[DiHenry]

Reduced airflow from the air vents significantly impacts comfort, especially in summer. Common causes of insufficient airflow include clogged filters, fan malfunctions, or pipeline leaks. The DIY inspection steps are simple: First remove and clean or replace the filter; then start the AC to listen for abnormal fan noises; check connections for refrigerant leaks. Address these issues promptly to prevent excessive power consumption that could affect driving range.