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Should You Use Internal or External Air Circulation on Rainy Days?

1 Answers
DeLukas
07/29/25 10:02pm
It is recommended to use external air circulation in the car on rainy days. When the weather is cold during rainy days, both side windows can fog up, obstructing the driver's vision. Therefore, first use the external air circulation to adjust the airflow towards the windshield, then switch to external circulation to expel the steam exhaled by passengers out of the car. Introduction to External Circulation: External circulation mode uses a fan to draw outside air into the car, meaning the airflow between the outside and inside of the car is connected. The air blown by the fan comes from outside the car, and even if the fan is turned off, airflow is still drawn into the car while driving, replenishing fresh air inside. Sometimes, you may feel airflow even when the fan is off, which is because the external circulation is set. When driving in the city and encountering traffic congestion, the car may fill with exhaust fumes, which is caused by using external circulation. When to Use External Circulation: When using internal circulation for an extended period and it's inconvenient to open the windows, you can periodically switch to external circulation to bring fresh air into the car. When there are many passengers in the car, using external circulation can maintain fresh air and prevent excessive humidity inside the car from causing window fogging.
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Should the Tayron use 5W-30 or 5W-40 engine oil?

The Tayron should use 5W-40 engine oil. Differences between 5W-30 and 5W-40 engine oil: 5W-40 offers better oil stability than 5W-30 under extremely high-temperature conditions in the engine. For older vehicles, using 5W-30 oil may result in slightly louder engine noise compared to 5W-40. For oils of the same quality grade, 5W-30 has better fluidity than 5W-40, which helps reduce fuel consumption and dissipate engine heat more quickly (low-viscosity oils have better fluidity than high-viscosity oils). For engines that strictly require 5W-40, using 5W-30 may lead to higher-than-normal oil consumption (commonly known as "burning oil"). Meaning of engine oil grades: These indicate the viscosity and quality of the oil. Gasoline engine oil quality grades are classified as: SA, SB, SC, SE, SF, SG, SH, SJ, SL, SM, with quality increasing from left to right. The "S" stands for gasoline engine oil, and the following letters represent the grade. Low-temperature viscosity grades are: 0W, 5W, 10W, 15W, 20W, 25W, with smaller numbers indicating better cold-start performance. "W" stands for "winter," indicating low-temperature performance. For example, 0W oil freezes at -35°C, while 5W oil freezes at -30°C.
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What causes the instrument display system failure in Audi A8?

Here are the reasons for the instrument display system failure in Audi A8: Severe brake pad wear: It may be due to severe brake pad wear. When brake pads with sensor wires wear to the limit position, the sensor wire will automatically connect the circuit, triggering the fault light. Low brake fluid level: It could be caused by insufficient brake fluid. Brake fluid plays a crucial role in the vehicle's braking system. When the driver presses the brake pedal, the force is transmitted by the piston in the master cylinder through the brake fluid to the wheel cylinders at each wheel, causing the brake pads to contact the wheels and stop the vehicle. Insufficient brake fluid is often accompanied by noticeably reduced braking power, and in severe cases, complete loss of braking may occur. This issue can be resolved by promptly replenishing the brake fluid. Failure to meet combustion conditions: If the basic conditions for proper combustion are not met, driving performance issues may arise. Compression pressure is one of these basic conditions. Compression pressure is related to the amount of air-fuel mixture in the cylinder and the piston stroke. These operations are fundamental engine functions, and abnormal compression pressure can lead to driving performance problems.
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Can a New Car Be Driven on Mountain Roads During the Break-in Period?

A new car during its break-in period can be driven on well-paved mountain roads, but it is advisable to avoid poorly maintained roads. Warm-up: During a cold start, it is best to wait until the engine coolant temperature reaches above 40 degrees Celsius before moving. Start gently by slowly releasing the clutch and gradually pressing the accelerator pedal, and choose smooth roads for driving. Avoid revving the engine when parking. Speed Control: During the break-in period, it is crucial to control the driving speed—avoid excessively high speeds, preferably keeping it between 50 to 80 km/h. After driving 1,500 kilometers, you can gradually increase the engine speed and vehicle speed to the maximum allowed by the car. Avoid harsh acceleration to ensure that pistons, cylinders, and other critical components increase their load under moderate conditions. Frequent Gear Shifts: Avoid using a single gear for extended periods. Start in a low gear and progressively shift to higher gears, driving in a step-by-step manner. Be sure to avoid scenarios like high speed in low gear or low speed in high gear.
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What Engine Displacement Qualifies as a Heavy Motorcycle?

The so-called heavy motorcycles generally have an engine displacement of 600cc or above. Heavy Motorcycle Displacement: Large-displacement touring bikes such as the BMW K1600GT/GTL, Honda Gold Wing 1800, etc. Also, the so-called liter bikes like the Yamaha R1, Aprilia RSV1000, Honda CBR1000, Suzuki GSXR1000, Kawasaki ZX-10R, as well as some street bikes and off-road models. Heavy Motorcycle Displacement: Motorcycles with displacements around 400cc–600cc are generally classified as mid-range: some entry-level mid-range sports bikes like the Honda CBR600RR, Kawasaki ZX-6R, and premium scooters such as the Suzuki Burgman 650, Honda Silver Wing 500, Yamaha T-MAX 500, Piaggio X9500, Gilera Nexus 500, Malaguti Spider Max, Peugeot Satelis 500, etc.
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What battery model does the Teana key use?

The battery model for the Teana key is CR2032. CR2032 is a lithium manganese dioxide battery, named according to the IEC standard. The breakdown is as follows: C - Indicates a chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode; R - Indicates the battery shape is cylindrical (if square, F is used instead); 20 - Indicates the battery diameter is 20mm; 32 - Represents the battery height of 3.2mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity ranges from 200-240mAh, varying by manufacturer. The shelf life of a CR2032 is typically 5 years. However, if the manufacturer's production standards or quality control are poor, the lifespan can be significantly reduced. Top-tier domestic brands generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), the lifespan can extend to 8 or even 10 years. Generally, replacing a car key battery involves just three steps: Step 1: Remove the mechanical key. Press the latch on the side of the smart key to release the mechanical key. Step 2: Open the battery cover. After removing the mechanical key, you'll notice a deep slot and a shallow slot at the top of the smart key. The deep slot is for the keyhole, while the shallow slot is used to open the battery cover. Insert the mechanical key into the shallow slot and pry it open to reveal the coin cell battery. Gently remove the old battery. Step 3: Replace the battery. Insert the new battery, then reattach the battery cover and mechanical key to complete the replacement.
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What is the function of the oil pressure relief valve?

The function of the oil pressure relief valve is to prevent the oil pump pressure from exceeding the specified limit. At high speeds, the oil pump's delivery volume increases significantly, leading to notably higher oil pressure. Additionally, during cold engine starts, the oil's high viscosity and poor fluidity cause a substantial rise in oil pressure. Typically, the relief valve is installed on the oil pump or the main oil gallery of the engine block. When the oil pressure reaches the predetermined value, the relief valve opens, allowing excess oil to return to the oil pump inlet or directly flow back to the oil pan. Function of the oil pump: The oil pump pressurizes and delivers oil from the oil pan to various oil passages (for cooling purposes) and the oil filter (to clean the oil), while also lubricating the cylinders, ensuring smooth and normal engine operation. Fuel pump: The fuel pump is a critical component of the vehicle's fuel supply system. If it fails during operation, the vehicle will be unable to move. Poor performance can result in hesitation during acceleration. Failures often occur without warning, making the vehicle difficult to start and inconvenient to address. Therefore, timely detection, diagnosis, and resolution of such issues are crucial.
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