The recent cold air has not only brought dampness and coldness, but also brought the trouble of fogging on the front windshield. Faced with this old problem that seriously affects driving safety, let’s take a look at the causes of fog and some tips for defogging.
1. The generation of fog
Regarding the principle of fog generation in car windows, we will not go into complicated details. Simply put, it is caused by the temperature difference of "cold outside and hot inside". The temperature inside the car is higher than the outdoor temperature, and fog forms. The water mist mentioned in this article refers to the inside of the glass, so the wiper is not very effective.
2. Demisting method
There are many methods of defogging. In fact, they can be simply divided into two types: spending money and not spending money. Window convection will not bring additional costs, but it is subject to many constraints. The use of air conditioners to defogging should be the most common, but there are also considerations whether to turn on cold air or hot air, which will be introduced to you later. The market for special defogging agents is mixed, and the price range is also large and difficult to distinguish. It is recommended that you make your
The recent cold air has not only brought dampness and coldness, but also brought the trouble of fogging on the front windshield. Faced with this old problem that seriously affects driving safety, let’s take a look at the causes of fog and some tips for defogging.
1. The generation of fog
Regarding the principle of fog generation in car windows, we will not go into complicated details. Simply put, it is caused by the temperature difference of "cold outside and hot inside". The temperature inside the car is higher than the outdoor temperature, and fog forms. The water mist mentioned in this article refers to the inside of the glass, so the wiper is not very effective.
2. Demisting method
There are many methods of defogging. In fact, they can be simply divided into two types: spending money and not spending money. Window convection will not bring additional costs, but it is subject to many constraints. The use of air conditioners to defogging should be the most common, but there are also considerations whether to turn on cold air or hot air, which will be introduced to you later. The market for special defogging agents is mixed, and the price range is also large and difficult to distinguish. It is recommended that you make your own defogging agent. The specific methods will be introduced in detail.
1. Window convection
If you find that there is not much fog in the car, you can open the windows on both sides to form a gap, so that the air inside and outside the car will form convection, the temperature difference will also be reduced, and the fog will slowly disappear. The principle of this method is the same as turning on the air conditioner to cool down the air, but it does not increase fuel consumption. The disadvantages of opening windows for convection are very obvious. It is not suitable in rainy and snowy weather, on highways, or when there is heavy fog. Moreover, opening windows will lower the temperature inside the car.
2. Air conditioning system
For most car owners, using the air conditioning system to remove fog is the most common. Nowadays, almost all cars on the market have air-conditioning outlets under the front windshield. You only need to select the corresponding gear of the air conditioner to use the wind blown by the air conditioner to remove fog. But should you use cold air or warm air? Both cold and warm air have their own advantages and disadvantages. If you are in a hurry to hit the road, you can use cold air for emergency use. In most cases it is recommended that you use warm air.
Turn on the fan and refrigeration switch in the car, and the cold air will blow onto the front windshield and the fog will disappear quickly. The effect is very direct. But the biggest drawback of this method is that the people in the car will feel very cold. In the already cold winter, it feels uncomfortable to feel the cold air from the air conditioner. And after turning off the cold air, the fog may appear again. Therefore, we do not recommend using cold air to remove fog.
The effect of blowing glass with hot air is better than that with cold air. However, since the water temperature is very low when it is first started, it takes a while for the air conditioner to blow out hot air, so the time is longer than using cold air. At the beginning, the fog inside the car will become larger. This is because the temperature difference between the inside and outside is greater. After the hot air dries the moisture in the car, the fog will disappear. Special tip: If you use this method, be sure to use warm air to defog before driving and wait for the fog to completely disappear on the road.
3. Defogging agent
They are sold in many places such as auto parts stores and supermarkets. Spray the defogging agent onto the inner surface of the car glass and wipe it clean. While removing the dirt on the glass, it can also form a protective film to prevent the fog layer formed by the condensation of water vapor on the glass. Spraying and wiping once can prevent fogging for about ten days. Prices range from more than a dozen yuan to hundreds of yuan. The current defogger market is a mixed bag, and it is easy to buy products that are not effective. In fact, there is no need to waste money, just make your own.
In fact, we can completely blend the "anti-fog agent" ourselves, and the effect is not bad. The easiest way is to blend it with detergent. Mix washing liquid and water in a ratio of 1:10, then use a clean soft cloth to dip it in and apply it on the inside of the front and rear windshields. You can also pour it into a small watering bottle for use. This method is very simple to operate and saves money. I recommend everyone to try it.
Defog the rear windshield and exterior mirrors
Cars currently on the market basically have the "rear windshield electric heating" function. The button positions will be different, but the functions are the same. Turn on the "rear windshield heating" switch, and the fog on the rear windshield will disappear in just a minute or so. It is worth noting that when you wipe the rear windshield, you must follow the direction of the resistance wire.
In dry climates, exterior rearview mirrors are generally less prone to fogging. Even if it occurs, the removal method is very simple. If your car is equipped with electric heating for the exterior rearview mirror, just turn on the switch and the fog will disappear quickly. Without this function, you can only defog "manually".
Summarize:Comprehensive comparison of these defogging methods, the two more recommended methods are homemade defogging and warm air defogging. This method is better both from an economic point of view and from a comfort point of view. The purpose of defogging is to improve driving safety, so please remember: no matter which method you use to defogging, it must be done before driving.
Content source: Online car market
