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What Causes Intermittent Operation of Car Air Conditioning?

2 Answers

LeIsabelle

07/28/25 11:06pm

Multiple reasons are as follows: 1. The air filter in the vehicle's air conditioning system is excessively dirty and needs replacement. 2. The air conditioning compressor lacks refrigerant, causing abnormal operation. 3. The air conditioning control panel is damaged. 4. The vehicle is equipped with automatic air conditioning, which shuts off the system when the set temperature is reached. There are two operation modes for the vehicle's air conditioning system: 1. First mode: Press the AC switch directly to activate the system, then adjust settings via the control panel to achieve desired cooling. 2. Second mode: Press the AUTO button to enable automatic air conditioning, after which only temperature adjustment is needed for normal operation without interference.

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ArabellaMarie

08/12/25 3:31am

I've been repairing cars for over 20 years and have seen many cases of intermittent air conditioning failures. The most common issue is with the AC compressor clutch, which is responsible for compressing the refrigerant. If it's worn out, it can slip intermittently, causing the AC to fail. Additionally, insufficient refrigerant or leaks can also cause this problem, as unstable system pressure leads to erratic AC operation. The electrical system is also crucial—aging relays or sensors with poor contact can cause the AC to work intermittently. Another possibility is a stuck fan motor or a clogged condenser, which affects cooling efficiency. When encountering such issues, I recommend car owners first check the fuses and relay box—it's a simple DIY task. If unsure, it's best to visit a professional shop to test the pressure and check for refrigerant leaks, as attempting DIY fixes might worsen the problem. Especially during hot summer weather, safety is paramount to avoid overheating without AC on the road.

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Should you fasten the seatbelt or adjust the seat first when getting in the car for the Subject 2 test?

First, adjust the seat and rearview mirrors to the appropriate position, then fasten the seatbelt. The deduction rules for the Subject 2 test require: 1. Starting requirements: Failing to fasten the seatbelt when starting results in disqualification; failing to use the turn signal when starting deducts 10 points; starting with the door open or not fully closed results in disqualification. 2. Reverse parking requirements: Not following the specified route or sequence results in disqualification; the vehicle body crossing the line results in disqualification; failing to complete the reverse parking results in disqualification; stopping midway results in disqualification; exceeding 4 minutes results in disqualification. 3. Parallel parking requirements: Added rule—stopping midway or rolling results in disqualification; removed rule—touching or scraping the poles results in disqualification, as the new standard has replaced the poles in the parallel parking area with solid yellow lines. Crossing or sweeping the lines results in disqualification. Failing to use the turn signal after stopping and starting results in disqualification.

Can the driving test be taken when it rains during Subject Three?

Subject Three driving test can be taken when it rains. Here are some methods to handle the situation when it rains during the Subject Three test: 1. Turn on the windshield wipers in time when it rains: Adjust the speed of the wipers according to the intensity of the rain to maintain clear visibility. It is best to stop the car and turn on the hazard lights when visibility is poor. 2. Avoid sudden acceleration and hard braking: During the test, be sure to avoid sudden acceleration and hard braking, as the road is slippery and visibility is reduced in rainy conditions, making the wheels prone to skidding. Calm and careful operation is required. 3. Maintain a safe distance: When driving in heavy rain, pay more attention to keeping a safe distance than usual. Visibility is reduced in rainy conditions, and the road is prone to skidding. Remember not to brake suddenly but to use light and intermittent braking, which not only controls the speed but also gives the following vehicle enough time to prepare for braking in poor visibility. 4. Control the speed: Drive at a slower speed than usual during training in rainy conditions. During the Subject Three road test in the rain, the examiner will also be concerned about driving safety, so safety comes first, and the test is secondary.

What Causes the Sunroof Rattle in the Envision?

The causes of sunroof rattle in the Envision: 1. Insufficient lubrication of the sunroof sliding rails; 2. Dust accumulation in the sunroof tracks; 3. Loose sunroof screws. The Envision has a body length, width, and height of 4694mm, 1839mm, and 1686mm respectively, with a wheelbase of 2750mm. It features front-wheel drive, a front MacPherson independent suspension, and a rear multi-link independent suspension. The Envision is equipped with a 1.5T turbocharged engine paired with a 7-speed dual-clutch transmission. This engine delivers a maximum power of 124kW and a maximum torque of 250Nm. It also incorporates direct fuel injection technology and utilizes an aluminum alloy cylinder head and block.

What are the reasons for uneven wear between left and right brake pads?

Reasons for uneven wear between left and right brake pads are as follows: 1. The rate of wear is mainly directly related to the material of the brake disc and brake pads, so uneven material of the brake pads is one possibility; 2. Frequent braking during turns causes uneven force distribution on the left and right wheels, leading to uneven wear; 3. The right brake disc may be deformed; 4. Uneven retraction of the brake caliper pistons, such as one side's piston retraction bolt being dirty; 5. Significant difference in the length of the left and right brake fluid pipes; 6. The telescopic rod is sealed by a rubber boot, but if water enters or lubrication is insufficient, the rod cannot move freely, causing the outer pad to remain in contact with the disc and resulting in additional wear; 7. Inconsistent braking times between the left and right brakes.

What is the Difference Between 5w30 and 0w30?

5w30 and 0w30 engine oils differ in their low-temperature fluidity, with the following expanded details: Low-temperature fluidity of 5w30 and 0w30 engine oils: 5w30 engine oil can flow normally at temperatures as low as -30 degrees Celsius; 0w30 engine oil can flow normally at temperatures as low as -35 degrees Celsius. Engine oil naming: The 'w' stands for winter, and the smaller the number before the 'w', the better the oil's low-temperature fluidity. The number after the 'w' represents the oil's viscosity at 100 degrees Celsius. Functions of engine oil: Engine oil lubricates and reduces friction in the engine, assists in cooling, seals against leaks, prevents rust and corrosion, and provides shock absorption. Base oil is the main component of lubricating oil, determining its fundamental properties. Additives compensate for and improve the shortcomings of the base oil, imparting new properties, and are an important part of lubricating oil.

What does CVT mean?

CVT (Continuously Variable Transmission), directly translated as continuously variable transmission, commonly known as the stepless transmission, as the name implies, does not have specific gears. In operation, it is similar to an automatic transmission, but the change in speed ratio differs from the gear-shifting process of an automatic transmission; it is continuous, thus ensuring smooth and uninterrupted power delivery. In a CVT transmission system, traditional gears are replaced by a pair of pulleys and a steel belt. Each pulley is actually a V-shaped structure composed of two conical discs. The engine shaft connects to the small pulley, which drives the large pulley via the steel belt. Key points to note are as follows: 1. Theoretically, a CVT transmission system can have an unlimited number of gears, allowing for more flexible gear settings. It is easier to achieve a balance between gear ratio, speed ratio, performance, fuel consumption, and exhaust emissions compared to traditional transmission systems. 2. The mechanical efficiency and fuel economy of a CVT transmission are significantly better than those of a conventional automatic transmission, second only to manual transmissions, offering much better fuel efficiency. 3. Compared to traditional automatic transmissions, its cost is slightly higher, and improper operation increases the likelihood of issues.

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