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What is the reason for the loud humming noise when the Cayenne turns on the air conditioning?

2 Answers
Nadia
07/24/25 9:31pm
Cayenne's loud humming noise when the air conditioning is turned on indicates a malfunction in the air conditioning system, and it is recommended to have it inspected at a 4S shop. Related information: 1. Introduction: The interior of the Porsche Cayenne largely retains the classic Porsche style, such as the ignition switch located on the left side of the steering column, the three-spoke steering wheel, and extensive leather trim. 2. Expansion: The most significant difference is that the central dial of its five-gauge instrument cluster does not display the tachometer as in the sports car series but instead shows vehicle driving-related information. Additionally, the center console for adjusting the chassis and suspension is unique to the Porsche Cayenne, with these switches made of plastic featuring a metallic finish.
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DiAliyah
08/10/25 2:39pm
There are quite a few reasons why the Cayenne makes a buzzing noise after turning on the air conditioning, with the most common being the compressor working too hard. If the refrigerant is insufficient or lacks fluorine, the compressor will run at high speed, producing that buzzing noise—I've seen many such cases while repairing cars. Another possibility is worn-out fan bearings; when the cooling fan spins, increased friction can make the noise louder. Additionally, loose or worn belts can mix squeaky friction sounds with the AC noise, turning it into a buzzing sound. Also, dust or debris stuck in the fan blades can cause the same issue. I must remind you that if this problem isn’t fixed promptly, the AC efficiency will drop, and components may even get damaged. So, it's best to have a professional shop check the refrigerant pressure and fan condition.
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What to Bring for the Subject 3 Driving Test?

For the Subject 3 driving test, you need to bring your ID card to get your queue number and enter the examination site, which will be used for identity verification in the vehicle. No other items are required. Subject 3 includes the Road Driving Skills Test and the Safe and Civilized Driving Knowledge Test. It is part of the motor vehicle driver's license assessment and is the abbreviated term for the road driving skills and safe and civilized driving knowledge test in the motor vehicle driver's examination. The content of the Road Driving Skills Test varies depending on the type of vehicle you are licensed to drive. Content of the Subject 3 Road Driving Skills Test: Vehicle preparation, light simulation test, starting, driving in a straight line, shifting gears, changing lanes, pulling over, driving straight through intersections, turning left at intersections, turning right at intersections, crossing pedestrian crossings, passing school zones, passing bus stops, meeting oncoming vehicles, overtaking, making U-turns, and nighttime driving. Content of the Subject 3 Safe and Civilized Driving Knowledge Test: Requirements for safe and civilized driving operations, safe driving knowledge under adverse weather and complex road conditions, emergency handling methods for situations like tire blowouts, and post-accident handling knowledge.
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What kind of gloves to wear for Subject 2?

For Subject 2, you can wear cotton gloves to help relieve tension. The test content for Subject 2 includes: Large vehicles: Large buses, tractors, city buses, medium-sized buses, and large trucks are tested on pile driving, hill-start and stop, parallel parking, single-plank bridge crossing, curve driving, right-angle turning, narrow gate passing, continuous obstacle crossing, bumpy road driving, narrow road U-turns, as well as simulated highway driving, continuous sharp mountain road driving, tunnels, rain (fog) conditions, slippery roads, and emergency handling. Small vehicles: Small cars, small automatic transmission cars, small automatic transmission passenger cars for the disabled, and low-speed trucks are tested on reverse parking, hill-start and stop, parallel parking, curve driving, and right-angle turning. Three-wheeled vehicles: Three-wheeled cars, ordinary three-wheeled motorcycles, ordinary two-wheeled motorcycles, and mopeds are tested on pile driving, hill-start and stop, and single-plank bridge crossing.
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Must You Wait for the Voice Prompt Before Starting in Subject 2?

You must wait for the voice prompt before starting in Subject 2. If any part of the Subject 2 test is failed, the voice prompt will instruct the examinee to return to the waiting area and start over, indicating the beginning of the second attempt. Therefore, continuing with the reverse parking or proceeding to the next item is incorrect. During the Subject 2 test, always follow the voice instructions. Start only after hearing the "Start the test" voice prompt: After getting into the car and completing the preparations, start driving to the test area only after hearing the "Start the test" voice prompt. Upon entering the test area and reaching the test item point, the car will usually play a voice prompt like "XXX item, start the test." It is best to wait for the voice announcement before starting the test to avoid affecting the test results. Additionally, in some cases, the voice announcement may be delayed, but this does not affect the test results. Such situations are usually rare, and candidates should stay calm and provide timely feedback. Precautions during the Subject 2 test: If the "Start the test" announcement plays while adjusting the mirrors or seats, do not panic. You can continue with the preparations, as there is no time limit. Start the test only after completing the preparations. Many people fail the test because they panic and start hastily upon hearing the "Start the test" announcement during preparations, without completing the necessary preparations.
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Will I fail the subject 2 test if I don't wear gloves?

No, generally it's optional to wear gloves, there's no mandatory requirement. Below is relevant introduction about subject 2 test content and requirements: Main contents: Reverse parking, right-angle turns, curve driving, parallel parking, slope parking and starting. Each candidate has 2 attempts per test session. If both attempts fail, you need to wait 10 days before reapplying. Deduction standards: Not wearing seatbelt: deduct 100 points; Gear not in neutral when starting engine: deduct 100 points; Not using turn signals (including starting, lane changing, overtaking, turning, or pulling over); Turn signal not activated for over 3 seconds; Forgetting to turn off turn signals or incorrect use of turn signals: deduct 10 points; Stalling once: deduct 10 points.
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How many points are deducted for rolling back on the slope in Subject 2?

For slope fixed-point parking, if the vehicle rolls back less than 30 cm during start-up, 10 points are deducted; if it rolls back more than 30 cm, 100 points are deducted. Other point deduction items are as follows: After parking, if the right side of the vehicle body is more than 30 cm away from the roadside line, 10 points are deducted; if it is more than 50 cm away, 100 points are deducted; if the line is crossed or touched, 100 points are deducted. After parking, if the front bumper is not aligned with the pole line and the deviation is within 50 cm, 10 points are deducted; if the deviation exceeds 50 cm, 100 points are deducted. After parking, if the parking brake is not fully engaged, 10 points are deducted. If the start-up is not completed within 30 seconds, 100 points are deducted. If the engine stalls once during start-up, 10 points are deducted. If the gear is not in neutral or park when starting the engine, 100 points are deducted. Key points for slope fixed-point parking operation: Upon hearing the "slope fixed-point parking" instruction (about 20 meters from the pole), turn on the right turn signal, steer appropriately to the right, and drive slowly and straight along the right side of the road, paying attention to the distance between the vehicle body and the right side line. When the vehicle is about 10 meters away from the parking pole, approach the target slowly, accurately, and steadily. Accurately estimate the target, using the parking pole and a specific point on the windshield (or hood) (this point should be determined during practice due to differences in vehicle models and driver height). When the specific point on the windshield aligns with the parking pole, meaning the vehicle bumper aligns with the parking pole line, stop immediately.
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How soon can I schedule Subject 4 after passing Subject 2?

If you take Subject 3 first and then Subject 2, you can schedule Subject 4 the day after passing Subject 2. Here are the relevant details: Subject 2: The Subject 2 test is conducted in order. The test items include slalom, curves, hill start and stop, single-plank bridge (twice), and right-angle turns. For the slalom, you need to navigate back and forth once each, paying attention to speed and reference points. Hill start is also a key point, where the coordination of clutch and throttle is crucial. During the test, it's important to stay relaxed. Subject 3: Subject 3 includes starting, shifting gears within 20000mm, and stopping, with a passing score of 90. You also have two attempts. Pay attention to signaling, and when making a U-turn, ensure the wheels stay slightly outward to avoid crossing the line. Starting, changing lanes, making U-turns, and stopping all require signaling and avoiding crossing the line to pass.
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