Another way to prevent windows from fogging is to stick a special film. Such a film also has the property of preventing moisture accumulation. An anti-fogging car glass spray is also a great solution. The composition is applied to windows that were previously washed, dried, and degreased. In practice, the solution is effective, but one application is enough for only days.
You can also do an anti-fogging solution yourself by mixing ethyl alcohol with glycerin. The ratio is 1, where 1 is glycerin. The mixture is then placed in a spray bottle for ease of application. Sometimes instead of waiting for the heater to dry out the moisture, it is better to slightly open the windows. The cabin filter must be the right one and also changed on time. If you are unsure about its quality, it is better to buy a more expensive carbon filter than cheap aftermarket ones.
Also, the filter itself must be installed correctly. Also, do not leave wet things, like shoes, jackets, etc. It is also recommended to drain the water and properly wipe down the rubber mats.
Fabric mats must be removed from the vehicle and dried separately. If the car has been in high humidity conditions for a long time, it is necessary to dry the entire interior. Some systems will automatically turn it off after a set time period. Breathing in stale air is obviously not good for the body and it also causes the moisture-laden air to condense like crazy on the windows.
Two symbols are commonly used to identify the recirculation button. The modern symbol in the picture above and the older symbol in the picture below. So use the recirculation button sparingly and never when trying to clear the fog from the windows. Wet clothes snowy boots, wet floor mats all add moisture to the cabin, and that will turn to fog.
Keeping the moisture within your car to a minimum will help control foggy windows. You already know that moisture inside the car will cause foggy windows no matter how good your heater is. Check your floor mats for dampness, or better, lift your carpets at the kick panel, just enough to get your hand underneath.
A leak will need to be repaired as soon as possible, as it will eventually lead to expensive electrical issues. A heater system leaking is a nuance but a heating system that leaks inside the cabin is a total pain in the jacksie and a serious health hazard.
The core resembles a mini car radiator and in older cars often develops a small leak. As the core is positioned inside the car, buried behind the dashboard. The leak pools in the front foot-wells, soak into the insulation and carpets. Obviously, your health comes first, so fixing the leak is a priority. A leak that goes undetected can also cause engine frost damage, especially if the user tops up coolant with straight water.
And of course, a HVAC controller computer to manage it all. Blend doors are motorized flaps positioned inside the heater matrix. They open and close proportionally as directed by the HVAC controller. The blend doors direct air to different zones in the heating system. A faulty blend door motor is common and will need replacing. Controller losing blend door position is common too and simply requires calibration.
However, you may need a dealer-level computer to instigate the re-learn procedure. I listed the scan tool I use to fault find, actuate motors for testing and calibrating the HVAC system.
You can check it out here on the Auto electrical repair tools page. Faulty or loss of blend door position will cause fogging even with the heat on. It will well be worth your time — your safety depends on it, after all!
What you need to do to stop condensation is balance the outside and inside temperatures. This will happen, for example, on a winter day when you enter your car and turn the engine on. The steps we shared so far are useful to solve condensation issues whenever they happen. However, an important question remains: what can you do to prevent your car windows from fogging up again in the future?
There are a few tricks we can use to try to eliminate the source of the problem. Some of these tips may seem strange, but they have stood the test of time and are proven to actually work.
When we breathe, we produce moisture in the air. Our body heat is also a source of humidity. This is the main reason why car windows usually fog up after we make our way inside a vehicle. For example, wet towels or shoes after a day at the beach, your gym bag or open drinks can all be taken out of the equation. Is there any water leaking into your car? The rubber stripping on all doors, windows and sunroofs should always be in good condition to keep the inside of your car well-isolated. To be sure about whether or not you have any of these going on, have a professional check all of these for potential leaks.
So, this means that keeping your car windows spotless inside and out will help to get rid of excess moisture. You can use a normal window cleaner and microfiber drying towels to finish.
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