What is the reason for the fresh air blower failure in the Audi Q7?
2 Answers
The reasons are blower fuse, blower motor, and thermostatic resistor failure. The following is an introduction to the car blower: 1. Composition: The blower mainly consists of a motor, air filter, blower body, air chamber, base (also serving as an oil tank), and oil drip nozzle. 2. Working principle: The blower operates with an eccentrically placed rotor in the cylinder, changing the volume between the blades in the rotor slots to suck in, compress, and discharge air. During operation, the pressure difference of the blower automatically delivers lubrication to the oil drip nozzle, which drips into the cylinder to reduce friction and noise while preventing gas backflow in the cylinder. This type of blower is also called a vane-type blower.
I drive an Audi Q7 and love tinkering with minor car issues. There are several common causes of fresh air blower failures: motor aging or brush wear, which can lead to unusual noises or failure to operate after a few years; resistor failure resulting in unstable fan speeds or only working at high speeds; circuit issues like blown fuses or corroded connectors are common in humid environments; incorrect signals from the air conditioning control module or voltage instability can also cause it to stop working; foreign objects blocking the air intake are another trigger. My personal advice is not to ignore early noises—first check the fuse box and replace any blown fuses, then inspect for loose motor connections. Regularly cleaning the air ducts and filters can prevent issues. Delaying repairs can increase the load on other components, affecting overall AC efficiency and even making defogging difficult in winter, increasing driving risks. When problems arise, it's best to use a multimeter for a quick voltage test or seek professional repair to ensure a swift return to comfortable driving.
