3 Ways to Defog Your Windshield


Trying to maintain a comfortable temperature in your vehicle is always a struggle when your windshield fogs up. It can be annoying when you have to deal with it on a daily basis.

While winters in San Antonio are not the harshest, summers can be grueling. In either case, the difference in temperature on the inside and outside of your vehicle is what causes the fogging. The water vapor in the air condenses on your windshield.

To combat it, here are some quick ways you can defog your windshield so you can get to where you want to go.

Defogging Your Windshield on a Cold Day

When the weather outside is cold, small water droplets will form on the inside of your windshield and car windows when you turn the heater on.
Here are 4 nifty steps former NASA engineer Mark Rober suggests will clear your windshield up twice as fast as any normal way.

1) Turn Your Heater Up to Max

This may sound counter-intuitive considering warmer air in the car is what causes the condensation. However, warmer air has the ability to contain more moisture than colder air. Turning your heater up to its maximum setting will cause the air in your car to absorb the moisture on the windshield.

2) Turn Your AC On

Turning your AC on at this point will pull a lot of the moisture from the air as it passes over the cooling coils.

3) Make Sure Inside Air Circulation is Off

The air in cold weather doesn’t hold that much moisture. That said, when you bring winter air into your car and heat it up, you will ensure that the air inside has a lot of absorption capacity.

4) Roll Your Windows Down Slightly

Rolling down your windows a little for a short amount of time will cause the humid air inside to exchange with the dry air outside.
Another way: You can turn your defroster on and blow the warm air toward your windshield. This will evaporate any accumulating moisture. Turn off the recirculate on the AC so the air in the car isn’t reused. This tends to be a more comfortable solution that allows you to remain warm in the car.


Defogging Your Windshield on a Hot Day

You will find your windshield fogging up on the outside on a hot day. This is because the temperature and moisture levels outside the car are higher than inside it. Water vapor condenses on the exterior of the glass.
In this case, here’s what you can do to defog your windshield and windows.

1) Use Your Windshield Wipers

Using your windshield wipers will ensure you temporarily remove the small droplets formed on the windshield. Then you can proceed to balance out the temperature.

2) Turn Down the AC

Bringing your AC’s temperature setting to the warmest setting will increase the temperature in the car. It will be closer to matching the temperature on the outside without getting too uncomfortable. However, if you find that the windshield and windows are not defogging, you may need to turn the AC off for a while.

3) Turn Off Recirculation

As is the case with combating windshield fog in the winter, turning inside air circulation off will cause the moisture levels to balance out.

If you follow these easy steps, you should notice your windshield and windows defogging considerably quicker than if you were to simply wipe them down.

If you’re based in San Antonio and are having trouble with your vehicle’s windshield, contact Auto Glass in San Antonio. They have over 30 years of experience in the auto glass repair in San Antonio business. Their 24-hour mobile service means the experts come to you. Call now (210)793-7115.

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