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Should You Use Internal or External Air Circulation When Defogging Windows?

To defog the windows, you should turn on the external air circulation, press the defog button, activate the air conditioning (A/C), set the temperature to the lowest, and use external air circulation. Both cold and warm air can be used to defog car windows, but warm air is slower than cold air. The most effective method is using cold air, which blows dry cold air directly onto the glass, preventing water vapor from condensing on the surface and achieving defogging. The method for using warm air is the same as cold air, but note that warm air should not be used for defogging on rainy days, as it may initially worsen the fogging. The reason for car window fogging: There is a temperature difference between the inside and outside of the car. If the temperatures differ, the side with the lower temperature will have a lower saturated vapor pressure on its surface compared to the surrounding environment, causing water vapor to gather on the glass surface and form tiny droplets, resulting in fog. Methods for defogging car windows: Air Conditioning Cooling: Use the air conditioning's cooling and dehumidifying function to reduce air humidity and remove fog. In summer, especially when multiple people enter the car without turning on the air conditioning promptly, the exhaled humid air can quickly cause the windshield to fog up. In this case, turn on the air conditioning to blow cold air onto the windshield. The dehumidifying function will quickly remove the fog. If the humidity is too high and the air conditioning is ineffective, slightly open a window to rapidly reduce the cabin's humidity. Combining this with the air conditioning will yield faster results. Air Conditioning Heating: Use warm air to reduce the temperature difference and remove fog. In winter, blowing warm air onto the windshield quickly raises its temperature, reducing the temperature difference between the inside and outside surfaces and preventing heavy fogging. However, the rear and side windows heat up more slowly, so it takes longer to defog them completely. Whether using automatic or manual air conditioning, turning it on helps with dehumidification. Avoid setting the temperature to the coldest, as prolonged use may cause frost to form on the outside of the windshield. Applying Anti-Fog Spray or Other Preventive Measures: Spray a small amount of defogging agent on the car windows and wipe it clean to remove dirt and stains. This leaves a thin, transparent protective film that effectively prevents water vapor from condensing into fog, especially useful in cold winters. Alternatives to defogging agents include dish soap, soapy water, glycerin, alcohol, or saline solution. After applying, let it dry and then wipe off excess residue with a chamois or soft dry cloth. This can keep the windows fog-free for several days. Opening Windows for Airflow: If the fogging is minor, opening the side windows can create airflow between the inside and outside of the car, reducing the temperature difference and gradually dissipating the fog. This method works on the same principle as using cold air from the air conditioning. However, it has obvious drawbacks: it cannot be used during rain, snow, on highways, or when the fog is heavy. Rear Windshield Heating: Most cars have a rear windshield heating function, though the button location may vary. Turning on the heating switch will clear the fog from the rear windshield in about a minute.

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Why is there no hot air coming from the car?

There are several reasons why the car's air conditioning does not produce hot air when turned on: 1. The heating function of the air conditioning takes about 5 to 10 minutes longer to blow air compared to the cooling function because it hasn't reached the preheating time yet. 2. The four-way valve may not be open, or the four-way valve itself may be stuck, or the electrical control may not be outputting voltage to the four-way valve. 3. There might be a lack of refrigerant, as heating requires slightly more refrigerant than cooling. 4. The indoor pipe temperature sensor may be damaged. After starting and running, the compressor and fan motor of the outdoor unit need to operate for a while before the indoor unit's fan motor begins to blow air. This is to ensure that the indoor unit does not blow cold air, which could make people feel uncomfortable, a feature known as "cold air prevention."

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How to Adjust the Throttle Position Sensor?

Here are the steps to adjust the throttle position sensor: 1. Loosen the two fixing screws of the throttle position sensor. 2. Insert a 0.35mm feeler gauge between the throttle stop screw and the stop lever, while using a multimeter to measure the quick switch conduction status. 3. Rotate the throttle position sensor counterclockwise to disconnect the quick switch contacts, then slowly rotate it clockwise. 4. Tighten the two fixing screws. Below are the functions of the throttle position sensor: 1. Detects whether the engine is in idle condition or under load, and whether it is accelerating or decelerating. 2. The throttle position sensor, also known as the throttle opening sensor or throttle switch, is a device used to detect the engine's operating state. 3. The working principle of the throttle position sensor is: converting changes in throttle opening into electrical signals input to the electronic control unit (ECU), which then determines the engine's operating condition based on the throttle position signal.

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What to Do If the ETC Device Falls Off?

ETC needs to be reinstalled and reactivated after falling off. The installation process for the ETC device is as follows: Upon receiving the device, first check if the ETC card and electronic tag (OBU) are damaged. Press the anti-tamper button on the back of the OBU; the red light will briefly turn on, and the OLED screen will display "Tag Invalid" or "Please Insert Card," indicating the device is functioning properly. Clean the front windshield to ensure the surface is smooth, clean, and dry. Then, peel off the adhesive backing of the OBU and stick it to the installation position. Press firmly for 2-3 minutes to remove any air bubbles. Insert the ETC card with the front facing the driver and the back facing the windshield, ensuring the chip is inserted into the OBU device. Method to activate the ETC device: Insert and remove the ETC card twice in succession until the electronic tag screen displays "Bluetooth On." If "Tag Invalid" appears when inserting and removing the card twice without the electronic tag attached, this is normal and does not affect activation. Alternatively, press the button on top of the electronic tag to enable Bluetooth. Turn on your phone's Bluetooth and open the corresponding mobile app (usually with a download QR code on the electronic tag). Navigate to the device activation interface. Click "Connect Device" and wait patiently for the "Connection Successful" prompt. Once connected, upload a photo of the vehicle's front to complete activation.

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How to Read Tire Size Codes?

Tire size codes are printed on the sidewall of the tire. Upon close inspection, you can find numerical sequences similar to the following example. For instance, P215/65R15-89H: 1. "P" stands for Passenger car tire (to distinguish from tires designed for trucks or other vehicle types); "215" indicates the section width of the tire, which is the distance between the two sidewalls (measured in millimeters). This width varies depending on the rim width the tire is matched with: wider rims pair with wider tires, and narrower rims with narrower tires. Generally, the width marked on the sidewall refers to the width when the tire is mounted on a rim of the recommended width. 2. "65" is the aspect ratio, representing the ratio of the tire's height to its width. Here, it means the height is 65% of the width. The smaller the number, the flatter the tire appears; "R" denotes the tire's construction, indicating it's a Radial tire, meaning its cord plies are arranged radially within the tire body. "B" signifies a Bias-ply construction, though bias-ply passenger car tires are no longer in production. 3. "15" indicates the rim diameter (in inches). This tire must be paired with a 15-inch rim; otherwise, it cannot be installed. "89" represents the load index, with this tire's maximum load capacity being 1,279 pounds. Different load indices correspond to different maximum load capacities (usually measured in pounds or kilograms). 4. "H" indicates the speed rating, meaning this tire's maximum speed is 130 miles per hour. In the older European sidewall marking system, it would be denoted as 215/65HR15. Different letters represent different speed ratings.

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How to Distinguish Between China 5 and China 6 Emission Standards for Vehicles?

China 6 and China 5 mainly differ in the content of emissions. When purchasing a new car, you can check the vehicle's factory certificate and the environmental standard list to distinguish between them. Below is some information about China 6 and China 5: 1. The primary difference between China 6 and China 5 lies in the emission content, with China 6 standards being significantly lower than China 5 standards. 2. The carbon monoxide emission limit for gasoline vehicles under China 5 standards is 1000 mg/km, while under China 6 standards, it is 700 mg/km. 3. The emission limits of 'China 6 standards' are approximately 40% to 50% stricter than those of 'China 5 standards'.

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What Are the Brands of Brake Pads?

Should You Use Internal or External Air Circulation When Defogging Windows?

Why is there no hot air coming from the car?

How to Adjust the Throttle Position Sensor?

What to Do If the ETC Device Falls Off?

How to Read Tire Size Codes?

How to Distinguish Between China 5 and China 6 Emission Standards for Vehicles?

Is a Car Produced 5 Months Ago Considered a Stock Vehicle?

How to Clean Willow Catkins in the Car Radiator?

How Many Liters of Engine Oil Should Be Added to a Car?

What does 0w20 represent?