The car is cooled by air conditioning, and there is fog on the front windshield, what s going on?

Fogging inside the windshield is a common cause of this.

1. The humidity in the car is too high.

2. The temperature outside the car is too low.

Causes water vapor to liquefy on the windshield.

Effective ways to avoid it.

Method 1: Spraying anti-fogging agents and other preventive methods. Spray a little defogging agent on the car glass window (inner wall) and wipe it clean to remove the dirt and stains on the glass window.

While polishing the glass, a thin layer of transparent protective film is formed on the glass, which can effectively prevent the condensation of water vapor on the glass and form a fog layer, which is especially suitable for cold winters. Alternatives to anti-fogging agents and dish soap, soap, glycerin, alcohol or salt water are allowed to dry before wiping off excess fibers with suede or a soft, dry cloth that will keep the glass from fogging up for a few days.

Method 2: Air conditioning and refrigeration method. The air conditioner refrigeration and dehumidification function is used to reduce the air humidity to remove fog.

When in summer, especially after many people enter the car, the air conditioner is not turned on in time, and the humidity of the air exhaled by people is large, and soon the front windshield will fog up. At this time, you can turn on the air conditioner to blow cold air on the front windshield, and use the air conditioner's dehumidification function to remove the fog vapor on the front windshield slightly. However, if the humidity is too high and the effect of air conditioning is not obvious, you can open the windows a little to quickly reduce the humidity in the cab.

Of course, it can also be used in conjunction with air conditioners, and the effect will be faster.

Method 3: Air conditioning and heating method. Fogging is removed by reducing the temperature difference.

In winter, the warm air is used to blow hot air on the glass, which quickly increases the temperature of the front glass and reduces the temperature difference between the inner and outer surfaces of the window glass, which can prevent the fog vapor of the front windshield from being too heavy in time, but there is a point that the temperature of the rear and side glass rises slowly, so it takes a long time to remove all the fog.

Defrost (fog) operation: If it is an automatic air conditioner, press the defrost switch and set the temperature to 20 24; If it is a manual air conditioner, you need to turn the air mode selection button to the defrost position, put the air intake selection to the external circulation, set the temperature to the hotter position, fan 3 4 gears, and press the AC switch to turn on the air conditioner.

NOTE: Whether it is an automatic or manual air conditioner, the air conditioner is turned on (i.e. the screen shows AC), which is conducive to dehumidification; Do not control the temperature of the air conditioner in the coldest position, otherwise the outside of the windshield will be easy to fog up after long-term defrosting. Hope!

The car is cooled by air conditioning, and there is fog on the front windshield, what's going on? I think it's foggy caused by infrequent use, right?

In the refrigeration process of air conditioning, due to the low temperature of the air conditioner evaporator, condensation droplets are formed in contact with the atmosphere, which are discharged through the drainage pipe and drainage holes, and the dredging of the drainage pipes and drainage holes can prevent fogging of the front windshield.

The fogging of the front windshield is mainly due to the large temperature difference between the inside and outside of the glass.

Open the front windshield of the air conditioner to fog up and solve:

1. Open the window.

In the case of small fog, you can properly open the windows on both sides to allow air convection, so as to eliminate the temperature difference on both sides of the windshield, and the fog is naturally difficult to form. Or turn on the air conditioner to cool the air, which can eliminate the fog in a very short time. These two methods can be effective quickly, but the disadvantage is that it should not be carried out for a long time when the weather is cold, or when it is snowing and raining.

2. Blow the wind. Blowing cold air is a situation that has a quick effect but does not cure the root cause, while blowing hot air can fundamentally solve the problem of glass fogging. The fog doesn't fog up after the hot air turns off, and it doesn't make the occupants of the car even worse in the cold winter. However, the biggest problem with blowing hot air is that it is slow to produce results, and it takes a long time to see the effect.

And it is more fuel-consuming to turn on the heater while driving, and the cost is a bit high.

3. Use a defogger.

The principle of the defogger is simple, spraying a layer on the windshield can form an effective protective film, which prevents the condensation of water mist. However, this protective film has a short expiration date and requires repeated spraying over a long period of time to maintain the effect. Hope to adopt, thank you!!

This is the glass to the inner surface temperature from and the interior of the car.

The difference in gas temperature is too large, resulting in this situation.

In general, the air conditioning wind direction you choose is "only blowing glass", and the air conditioning wind direction is: blowing only glass, blowing glass at the same time and the front of the passenger at the same time, blowing the front and feet of the front windshield at the same time, and changing the air conditioning wind direction, generally 5-10 minutes.

The reason for the fogging of the windshield is due to the large temperature difference between indoor and outdoor in winter. If.

In the process of driving, if the inner environment of the driving ring is more complicated, the tolerance can be carried out by turning on the cold air, which has the advantage of quickly removing the fog on the windshield and avoiding the inability to see the road conditions due to fogging. However, because the indoor temperature needs to be high in winter, after removing the fog, the temperature should be adjusted to the warm air position several times to prevent the fog from reappearing. If you are in the parking phase or just hot car stage, you can directly use the way of blowing warm air, although the fog removal time is relatively slow, but the warm air should be turned on all the time, if necessary, turn on the front windshield defrost function.

This prevents the fog from re-generating and meets the temperature needs of the indoor driver.

1. Rational use of air conditioning system.

2. Use special anti-fog products.

3. Open the window to convection of hot and cold air.

4. Wipe with dish soap and dry cloth.

5. Defogging of the heating wire of the rear windshield.

Reason: The air in the cabin is hotter and the front windshield is cooler. Moisture in the air inside the cabin condenses on the front windshield, resulting in fog.

Solution: The premium sedan will have a separate front windshield defog switch, turn it on.

For low-end cars, you can adjust the fan outlet to the front gear ratio, so that the hot air blows on the front windshield to facilitate the evaporation of water vapor.

Precautions for driving in winter:

1. Do a good job in seasonal maintenance of vehicles. Carry out comprehensive inspection and maintenance of vehicle brakes, steering, driving systems, gas pipelines, water pipelines, oil pipelines and other components, equip the vehicle with necessary anti-freezing devices, and add engine oil and gear oil according to regulations.

2. Grasp the road condition information through TV, radio and other means in advance, bring necessary tools such as snow chains and shovels, and prepare in advance.

3. When driving on ice and snow roads in winter, you should not drive in higher gears, but should control the power of the vehicle and leave room for it, and minimize the number of gear changes to prevent accidents. Maintain an even driving speed when driving, reduce the speed of the vehicle, reduce or avoid changing lanes and overtaking vehicles as much as possible, and strictly prohibit the use of emergency braking.

4. When driving in foggy weather, turn on the anti-fog lights and low beam lights in time, reduce the speed, strictly abide by the principle of passing on the right side and going their own way, and maintain a sufficient safety distance between vehicles and pedestrians.

5. In winter, the operation of the vehicle must be paid attention to not too strong and too large, especially the action of hitting the direction and stepping on the brake can not be too strong and too large.

6. Keep a safe distance from the car in front of you, and leave sufficient reaction time and braking distance.

7. When steering on ice and snow roads, reduce the speed of the vehicle in advance, turn the steering wheel slowly, and pass at a constant speed to avoid sudden direction, otherwise it is easy to cause the car body to slip and lose control.

It is mainly caused by the large temperature difference between indoor and outdoor, so he will have condensation, inside you can use a cotton towel to wipe it, outside is serious, you can use a wiper brush to scrape.

It's because the temperature inside is higher than the outside, so the outside temperature is too low to cause dewdrops.

It is because the temperature of the windshield is low, and the hot wind blows up and the cold and hot alternately will definitely fog up, at this time open the external circulation, and then blow the wind direction to the windshield and turn on the AC switch, the fog will disappear immediately, and there is no need to change the temperature of the air conditioner. After a while, turn off the AC, because the AC is a compressor, which is refrigeration, and at the same time increases fuel consumption.

Because the temperature of the windshield is low, the hot wind blows up and the alternation of cold and hot will definitely fog up, at this time open the external circulation, and then blow the wind direction to the windshield and turn on the AC switch, the fog will disappear immediately, no need to change the temperature of the air conditioner. After a while, turn off the AC because the AC is a compressor and is refrigerated.

The principle of window fogging is caused by "large temperature difference between internal heating and external cold", which is only macroscopic water vapor liquefaction, and microscopic is related to saturation pressure. The outside temperature is high, the saturated air pressure of water vapor is large, the temperature of the glass is low, the saturation pressure of water vapor near the glass decreases, when the temperature difference is large enough, the saturation pressure is low enough, and the water is liquefied. The closer you are to the glass, the lower the saturation pressure of the water, and the easier it is for the water to liquefy.

The water molecules in the air are constantly moving irregularly. When there is no temperature difference, water molecules keep hitting the glass and flying out of the glass. Because the lower the temperature, the slower the rate of movement, so after the water molecules hit the cold glass from the hot air, the movement slows down and cannot fly out in time, while the water molecules outside are still hitting the glass, so the water on the glass is more and more, and finally gathers into small water droplets.

Saturation pressure can be understood as the maximum amount of a certain gas (such as water vapor, alcohol vapor, etc.) that can exist in the air at a certain temperature, and when the actual amount of a certain gas in the air is greater than this amount, it will be liquefied. The glass and water are infiltrated, so the water is aerosolized back on the glass, but the mercury does not fog up. Therefore, the principle of some glass defoggers is to cover the surface of the glass with a film that does not infiltrate with water.

Defogging method skills

In the case of small fog, you can properly open the windows on both sides to let the air convection, so as to eliminate the temperature difference on both sides of the windshield, and the fog is naturally difficult to form.

In winter, if you encounter fogging, you can try to turn on the external circulation mode of the car, which can also reduce the fogging situation. In winter, the car is warmed up after starting, and after the water temperature rises to normal temperature, the hot air system can be turned on, so that it will not fog up again during driving, because the inside of the car is dry.

Applying glass water to the inside of the front windshield can prevent the glass from fogging. In fact, to apply glass water, you need the alcohol ingredient in it. Dip a dry towel in the mixture and apply it to the inside of the glass, and then wipe off the water marks with a dry towel after drying.

In general, it is enough to wipe it once a month.

Reason: Because the temperature inside the car is much lower than the temperature outside, the moisture in the outside air condenses into water when it hits the windshield with a very low temperature, which is the same as the glass window in the room in winter.

Measure: The temperature is too low. Or it's humid outside. I generally use the inner circulation, air conditioning vents with the feet and head. It won't affect the front windshield.

Windshield. The windshield was a whim of Ford in the twenties of the twentieth century, sandwiching two pieces of glass together and separating them with a layer of PVC plastic to make a sandwich-like glass. This technique is still being used today.

Repair considerations.

1. Within two days of replacing the glass, you can not wash the car and try to drive on a flat road.

2. Before repairing the car glass, completely remove the dirt of the car glass. Choosing detergents and related cleaning products is a good choice.

3. It needs to be closed after 5-10 minutes of defogging heating, otherwise it is easy to cause the rear windshield to burst.

4. Repair the crack not more than 20 cm, because the safety factor after repair is not as high as the original.

Hello This is caused by the temperature of the inner surface of the glass and the temperature of the air in the car, which is generally caused by the air conditioning direction you choose is "only blowing glass". The wind direction of the air conditioner is: only blow the glass while blowing the glass and blow the front of the passenger at the same time the front and feet, etc., fog in the front windshield to change the air conditioning wind direction is generally 5-10 minutes.

There is fog water outside the front windshield of the car when the air conditioner is opened, because the temperature outside the car is lower than the temperature inside the car, so that the water vapor in the car forms many tiny water droplets, and the surface of the front windshield is not absolutely flat (there are many small pits), so these small water droplets are attached to the front windshield, which is the reason for the formation of fog on the glass.

Hello, the fog outside the window glass is gone after the car is driven, you can also open the wipers and brush it down.

There is fog outside, direct wipers, are you the wind direction adjusted to blow on the glass.

The fog outside the window glass is gone after the car is driven!

caused by temperature difference between inside and outside and air humidity. If the temperature inside the car is high and it is cold outside, the moisture inside the car will condense onto the cold glass, forming a fog. At this time, it is usually necessary to turn on the air conditioner and adjust to the position of blowing glass, and use warm air to blow the fog away.

But the heat brings a larger fog for a short time before the glass is heated. Therefore, you can use cold air to blow the glass, or open a little window, so that the temperature of the glass is consistent inside and out, and there will be no fogging. In some parts of the south, the opposite is true, where the temperature inside the car is low and the outside is hot and humid, and the moisture will adhere to the cooler outside of the glass.

It can only be removed with wipers. Or pay attention to the air conditioning gear to prevent the cold air from blowing into the glass inside the car, and it will also avoid fogging outside.

This water mist is outside the glass, mainly the air conditioning wind blows on the glass, and the glass temperature is too low to condense the high humidity air outside on the surface of the glass. The solution is very simple: do not blow the air outlet of the air conditioner against the glass, if there is water mist in the front windshield, then you may turn on the air conditioning outlet defogging function.

Just turn it off. In general, water mist is produced in the event of rain because the air is humid. In this case, it is enough to adjust to defrost.