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What are the symptoms of a faulty car air conditioning solenoid valve?

2 Answers

SiennaLee

08/28/25 3:17am

Car air conditioning solenoid valve failure symptoms are: the air conditioning cannot function properly, leading to reduced driving comfort. The car air conditioning compressor solenoid valve is located at the front end of the clutch and controls the opening and closing of the air conditioning through power on and off. Most air conditioning solenoid valves are directly connected, with AC 220V or DC 24V, and a diameter of 3 to 25 mm. When the air conditioning starts, the electromagnetic coil generates electromagnetic force to open the valve, and the refrigerant begins to circulate. The car air conditioning system consists of a refrigeration system, heating system, air purification device, and control system, used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to an optimal state.

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DelRonan

09/09/25 8:38am

That time I drove to the seaside, the air conditioning suddenly stopped cooling, blowing out warm air that couldn’t lower the temperature at all. The car felt like a steamer, and I could hear a hissing noise, as if air was leaking. The mechanic took a look and said the solenoid valve was broken—it controls the flow of refrigerant, and once it fails, the compressor can’t start. Also, the AC kept turning on and off unpredictably, and the situation worsened when the fan blew. This issue is especially dangerous in summer, as long drives can easily lead to heatstroke, and the noise was incredibly irritating. In the end, I replaced the faulty part for a few hundred bucks, but at least the cool air was restored. My advice: don’t delay—get it checked and fixed as soon as you notice a problem to avoid bigger trouble.

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What Causes Abnormal Noises in a Car's Chassis?

Abnormal noises in a vehicle's chassis are mainly caused by faults such as loosening, wear, and failure of components in the steering system, suspension system, or braking system. Owners can visit a repair shop for inspection and handling. Below are the relevant details: Handling the fault: Inspect the area where the noise occurs based on the symptoms. Vehicle inspections are divided into static checks and dynamic checks. After parking the car, the wheels can be secured with triangular wooden blocks, focusing on checking the wear of needle bearings, rear axle bearings, and reducer bearings, as well as the tightness of various chassis components. Dynamic inspection of the noise involves determining the faulty area based on the pattern of the sound, with different parts requiring different repair methods. Cars are prone to abnormal noises: During prolonged operation, cars are subjected to various impact forces, which can cause wear or deformation of parts, leading to abnormal noises. Only by continuously accumulating experience in practice and understanding the patterns and characteristics of car noises can one accurately identify the source of the noise when it occurs and perform timely repairs.

Is It Okay to Idle the Car with AC On for Two Hours?

Yes, but idling the car with AC on can be harmful to the vehicle. Prolonged idling with the AC running increases fuel consumption and accelerates the formation and retention of carbon deposits in the engine. If the car is parked in a poorly ventilated area or inside a garage, occupants may also be at risk of carbon monoxide poisoning. Hazards of idling: Idling can lead to oil burning: During idling, the throttle opening is small, and the vacuum level inside the intake manifold is high, which can draw oil vapor into the intake manifold. Some of this oil vapor deposits inside the intake manifold, forming carbon-like substances or coking. Extended low-speed driving or idling, especially in turbocharged models, may result in a pool of oil inside the intake manifold behind the throttle body. However, this oil usually disappears after highway driving. Idling promotes carbon buildup: During idling, the air-fuel mixture tends to be richer, which can lead to engine carbon deposits over time. Similarly, stop-and-go driving at low speeds, such as frequent acceleration and braking, can also cause carbon buildup as the engine alternates between rich and lean fuel mixtures.

What Causes Water Leakage Under the Car?

Water dripping from the car chassis can be attributed to two main reasons: Air conditioning water: Most cars do not have water drainage hoses underneath, so the condensation from the air conditioning system is directly discharged from the chassis. Another possibility is that the windshield washer fluid pipe has been damaged due to scraping against the chassis, which can be fixed by replacing the pipe at a repair shop. Common damages to the car chassis include: Scraping the undercarriage or impact from foreign objects: Since scraping the undercarriage can occur unpredictably, it can easily damage components located in the chassis area, such as cracking the catalytic converter shell, engine oil pan, transmission housing, or causing deformation of the suspension system. These issues can lead to severe damage to the vehicle. Corrosion: With the worsening environmental conditions, even rain can be acidic, increasing the risk of damage to the car. The chassis frequently comes into contact with substances like sewage and grease, whose chemical components can gradually corrode the chassis and its components.

When Should Automatic Transmission Fluid Be Changed?

Automatic transmission fluid should generally be replaced approximately every 80,000 kilometers. Some automatic transmission vehicles may require fluid changes at 60,000 kilometers. It is recommended to adhere to the scheduled replacement intervals during regular vehicle usage, as this practice helps extend the service life of the automatic transmission. There are three common types of automatic transmissions found in vehicles: 1. The CVT (Continuously Variable Transmission) is the simplest in structure among automatic transmissions. Its internal mechanism consists of just two cone pulleys and a steel belt. The steel belt can move along the pulleys, enabling the transmission to vary speed and torque. 2. The dual-clutch transmission also features a relatively simple structure. Developed from manual transmissions, it essentially adds an extra clutch and shift control mechanism to the manual transmission design. One clutch controls even-numbered gears while the other manages odd-numbered gears. 3. The AT (Automatic Transmission) is the most complex, technologically mature, and widely used automatic transmission type. Also known as torque converter transmissions, AT transmissions connect to the engine through a hydraulic torque converter.

Is Driving Barefoot Legal?

Yes. Article 26 of the Road Traffic Regulations clearly states that driving in slippers is prohibited, making it illegal to drive while wearing slippers. However, the law does not explicitly prohibit driving barefoot. Below is a detailed explanation of driving barefoot: 1. The main difference between driving barefoot and driving with shoes is the reduced control over pedal pressure. Without the cushioning provided by shoes, initial driving may feel comfortable or even liberating, but prolonged driving can lead to muscle fatigue in the soles of the feet, weakening or even losing the perception of pedal feedback. This is especially true for manual transmission vehicles, where frequent movement between the three pedals can easily cause damage to the soles of the feet. Additionally, sweating on the soles can increase the risk of operational errors. 2. Although driving barefoot is not prohibited by law, the law cannot cover every specific and nuanced situation in society, such as smoking while driving, listening to music with headphones, watching in-car videos, or eating while driving. Driving barefoot does pose certain safety hazards, no matter how minor. Once public safety is involved, it is no longer a trivial matter.

What does the cylinder of a car mean?

The cylinder of a car refers to the cylindrical chamber in the engine where a piston is driven by the pressure or expansion force of the working fluid. In some special types of engines, there may be similar but non-cylindrical parts. Below is some relevant information: Number of cylinders: The number of cylinders indicates the quantity of cylinders in a car's engine. Common cylinder counts for car engines currently include 3, 4, 5, 6, 8, 10, and 12 cylinders. Engines with a displacement below 1 liter typically use three cylinders, those between 1.0 and 2.5 liters usually have four cylinders, around 3 liters generally have six cylinders, around 4 liters have eight cylinders, and those above 5.5 liters usually have twelve cylinders. Considerations: The forces acting on a cylinder during operation are influenced by many factors. The pressure difference between the gases inside and outside the cylinder affects it, and the cylinder also has to withstand the reaction force from the steam outflow when it is stationary. Therefore, special attention is needed when selecting a cylinder. If an appropriate cylinder is not chosen, it may not only damage the equipment but also delay the work.

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