What are the reasons for the failure of car air conditioning gears 1, 2, and 3?
2 Answers
Air conditioning gears 1, 2, and 3 may fail due to a blown air conditioning fuse or a damaged air conditioning circuit board. Below are the specific reasons and solutions: 1. Specific reasons: The air conditioning fuse is blown or the air conditioning circuit board is damaged; the compressor is damaged, or excessive moisture has entered the refrigeration system, reducing the drying effect and causing ice debris to block the pipes. 2. Solutions: If it's a fuse issue, simply go to a repair shop to replace and reinstall it; if there's a circuit problem, it's necessary to check at a 4S shop or a professional automotive electrical repair shop. If it cannot be repaired, it must be replaced.
Last time my Chevrolet's AC could only operate at the highest setting, the mechanic found a faulty blower motor resistor after inspection. This component controls the medium and low fan speeds and is located behind the glove box. The resistor plates are prone to deformation and failure due to long-term exposure to hot air blown by the fan. Later, it was also discovered that the 20A blower fuse in the fuse box had turned black, and replacing both finally solved the issue. Actually, worn knob contacts can also cause poor connection, especially noticeable in older cars with aged plastic clips. For DIY repairs, it's recommended to first check the fuse location (marked in the vehicle manual), then look for signs of burning on the resistor, and finally test the switch's continuity. If encountering this issue, avoid forcing the AC to run at maximum speed continuously, as it can easily burn out the entire blower motor assembly, leading to higher repair costs.
