Why does the car air conditioner's airflow fluctuate between strong and weak?
3 Answers
Fluctuating airflow in the car air conditioner is most likely caused by a faulty blower resistor. Generally, if there's an issue with the air conditioning damper control system, it can also lead to this phenomenon. It is recommended to have it inspected and repaired at a 4S shop. Below is relevant information about car air conditioner maintenance: 1. Regularly replace the filter: After using the air conditioner for a period of time, it's essential to pay attention to its cleaning. Regularly replacing the air conditioner filter helps extend the air conditioner's service life. 2. Maintenance of the car air conditioner's liquid storage tank: The liquid storage tank should be replaced promptly after two years of normal use. Every time the pipeline is disassembled for repair or cleaning, a new liquid storage tank needs to be installed. 3. Regularly check the refrigerant and refrigeration oil: Since the refrigerant used in cars today has strong permeability, even a well-functioning refrigeration system can experience insufficient refrigerant due to prolonged use, leading to reduced cooling efficiency.
Last time my car had the same issue, the AC was acting like it was gasping, blowing inconsistently. After struggling for a while, I found out it was the blower motor resistor that was broken—that little square thing that controls the fan speed. This part tends to overheat and burn out easily, especially when running at max speed in summer. The mechanic opened the glove box; the blower was behind it, and the resistor was scorching hot to the touch. After replacing it, everything ran smoothly again. The mechanic said oxidized wiring connectors in older cars can also cause this. Oh, and after the repair, I noticed a squeaking sound when lowering the fan speed, so I cleaned out some dried leaves stuck in the blower fan blades while at it.
Last year, the AC in my car was acting up too, making noises like it was gasping for breath. The 4S shop said the filter was clogged like a quilt! I hadn’t paid attention to changing the filter, and dust mixed with poplar fluff had clumped up, causing the airflow to stutter when forced through. They replaced it with an activated carbon filter—the old one they pulled out was blackened and even had a cockroach shell stuck in it. Now, I check it myself every quarter by removing the glove compartment and also wipe down the blower fan blades. A quick reminder: when using the outside air circulation mode, leaves can easily get sucked into the air intake.
