How to Activate the External Air Circulation in a Mercedes-Benz Air Conditioning System?

Where should the vehicle ETC be installed?

The ETC installation position for small cars is generally in the upper middle part of the front windshield, while for large vehicles such as trucks and buses, it is installed in the lower middle part. The appropriate installation position should be no lower than 1.2 meters and no higher than 2.5 meters, with an installation angle between 30 and 90 degrees. For vehicles with factory-installed or aftermarket explosion-proof film, which may affect microwave communication signal transmission, the ETC should be installed in the microwave sunroof strip. ETC stands for Electronic-Toll-Collection, meaning electronic toll collection system. To apply for ETC, the vehicle owner needs to provide original and photocopies of their valid ID card and vehicle registration certificate. If someone else is handling the application on behalf of the owner, they must also bring their own valid ID card. The photocopy of the vehicle registration certificate should include the page with the most recent annual inspection stamp. Additionally, a bank card for deducting highway toll fees is required, and the vehicle must be registered under an individual aged between 18 and 60. Here are some precautions for installing ETC: Do not obstruct the view; it is best to install it behind the rearview mirror: Many car models have windshields with a steep angle, which can reduce the driver's field of vision. If this is not considered during ETC installation, it may increase the driver's blind spots. Installing it on the right side behind the rearview mirror can help avoid obstructing the view. Do not interfere with charging: The ETC electronic tag consumes power but generally does not require charging or battery replacement, as it has a solar panel on the back for self-charging. Therefore, during installation, avoid the blackened areas on the windshield and positions that may block the solar panel. Do not remove it arbitrarily once installed: The button in the middle of the adhesive is an anti-removal lever connected to a switch. After installation, the windshield will press the anti-removal lever in. If the tag is removed arbitrarily, the lever will pop out and trigger the switch, locking the electronic tag and rendering it unusable. In such cases, you will need to visit an ETC service point to unlock it. This mechanism is designed to prevent multiple vehicles from sharing one device. When using ETC, note the following: The ETC transaction sensing range is 8 meters. To avoid paying for the vehicle in front due to its ETC device malfunction, maintain a distance of more than 10 meters from the vehicle ahead. The ETC lane recognition speed is 20 kilometers per hour; driving too fast may result in failure to read the vehicle's device information and cause toll deduction failure. If using a debit card linked to ETC, insufficient balance may also lead to toll deduction failure.

3

5

Share

What is the optimal position for adjusting rearview mirrors in Subject 2?

Methods for adjusting rearview mirrors in Subject 2: 1. The rearview mirror adjustment button is located on the inner side of the front door, allowing adjustments in four directions: up, down, forward, and backward. In some car models, the rearview mirror adjustment switch is near the window. 2. First, adjust vertically—simply press it to the lowest position. Taller students may slightly raise it, ensuring visibility of ground markings. 3. Then, adjust horizontally, keeping in mind that the standard is for the car body to occupy one-fourth of the mirror's area. Note: Rearview mirrors must be adjusted while maintaining a proper posture; otherwise, accuracy cannot be guaranteed.

10

0

Share

How to Control the Clutch?

Here are the methods to control the clutch: 1. Learn the correct posture for pressing the clutch: Place the ball of your foot on the clutch pedal with your heel touching the ground. When the clutch is pressed to its lowest point, keep your knee slightly bent. 2. Press the clutch to a point just above the critical value between semi-engagement and neutral coasting. The exact critical point varies with different vehicle adjustments. To find this critical value, first engage the gear, then press the clutch until the point where the gear just engages—this is the power engagement critical value. Slightly lifting the pedal will put it in the semi-engaged state. Then release the foot brake or handbrake, and the vehicle will start moving. 3. Control the position near the semi-engagement limit, and the vehicle speed will naturally adjust to idle. Since road surfaces are not perfectly flat—some have bumps, pits, or uneven friction—you must place your foot near the critical value between semi-engagement and neutral coasting, making slight adjustments to keep the vehicle moving at a constant speed throughout the test. 4. Do not release the clutch too quickly or deliberately raise the engine RPM too high. This not only accelerates clutch wear but may also cause the vehicle to stall, leading to a failed test due to an unexpected stop.

20

2

Share

What to Do If You Lock Your Keys in the Car

Methods to handle locking your car keys inside the car: 1. Generally, cars come with two keys—one for regular use and another as a spare. If the primary key is lost, the spare key can be used. You can either go back to get it yourself or ask a family member to bring the spare key. 2. Contact a professional locksmith. Make sure to choose a licensed and reputable locksmith company. They will ask for relevant documents, such as your vehicle registration and ID, before unlocking the car. 3. Most 4S shops offer after-sales rescue services. Simply call them and wait for the rescue team to arrive. 4. If the car is in a remote location and none of the above methods are feasible, breaking a window may be the only option. Avoid breaking the windshield, especially the triangular window, as replacement and repair costs can be very high. Instead, target the side windows—break them quickly and decisively to avoid injury from glass shards.

20

5

Share

What should be paid attention to during the break-in period of a car?

Precautions for the break-in period of a new car: 1. The speed should not exceed two-thirds of the maximum speed, the engine RPM should not exceed 3000-3500 (different car manufacturers have different requirements for engine RPM), avoid sudden acceleration and sudden braking. 2. Do not overload, pay attention to checking tire pressure, coolant, and brake fluid. 3. When driving downhill for a long distance, pay attention to controlling the speed and avoid suddenly using engine resistance to decelerate. For manual transmission models, gear shifts should be anticipated in advance, and shifting should not be done at inappropriate speeds. Introduction to the break-in period: 1. Generally, the break-in period for a new car is around 1000-1500 kilometers, and different manufacturers may have different regulations for different models. 2. During the break-in period, tires and brake pads have the shortest break-in time, usually around the first 200-300 kilometers. During this time, try to drive on roads with better conditions. Since new tires have not yet reached optimal adhesion, avoid sudden braking during sharp turns and brake in advance. 3. The engine break-in period requires about 1000 kilometers. In the first 500 kilometers, it is best to drive at a speed of 60-70 km/h, with the RPM not exceeding 2200 for optimal performance; between 500-1000 kilometers, the speed can be increased to 90-100 km/h, with the RPM below 2500 for the best results, which can promote the break-in process; after 1000 kilometers, the speed can be increased to below 120 km/h, and the RPM should not exceed 3000.

15

0

Share

Where Can I Still Register a China 5 Vehicle?

Cities where China 5 vehicles can still be registered include: Guangdong (excluding Guangzhou), Jiangsu (excluding Nanjing), Zhejiang (excluding Hangzhou), Sichuan (excluding Chengdu), Fujian, Guangxi, Ningxia, Hunan, Hubei, Xinjiang, and Yunnan. Cities where China 5 vehicles cannot be registered include: Beijing, Tianjin, Hebei, Shandong, Shanxi, Henan, Guangzhou, Shenzhen, Hainan, etc. Additional Information: Some regions have a three-month "grace period" for new China 5 vehicles. The following conditions allow for registration, modification, or transfer: 1. New China 5 emission standard light vehicles sold and issued with a unified motor vehicle sales invoice before June 30, 2019. 2. China 5 emission standard light vehicles that completed transfer registration procedures outside the region before June 30, 2019, and are intended to be relocated to the Pearl River Delta region. 3. New China 5 emission standard light vehicles in dealer inventory with a manufacturing date marked on the vehicle product certificate or an import completion date marked on the "Certificate of Imported Goods" before June 30, 2019.

15

1

Share

How to Activate the External Air Circulation in a Mercedes-Benz Air Conditioning System?

Where should the vehicle ETC be installed?

What is the optimal position for adjusting rearview mirrors in Subject 2?

How to Control the Clutch?

What to Do If You Lock Your Keys in the Car

What should be paid attention to during the break-in period of a car?

Where Can I Still Register a China 5 Vehicle?

What is Lingzhi?

What is the 0-100 km/h acceleration time of the Audi A4?

Should You Use Internal or External Air Circulation for Car AC in Winter?

What Causes Car Body Shaking?