Why Do Car Windows Fog Up Inside When Parked and How to Fix It

Foggy windows are a common occurrence in cars, whether you’re driving or parked. They can be frustrating and annoying, especially when you’re in a hurry. In this article, we will discuss the reasons why car windows fog up inside when parked and provide some solutions to this problem.

Causes of Foggy Car Windows When Parked

Source: storables

Car windows fog up due to condensation, which happens when there is a difference in temperature between the inside and outside of the car. This usually occurs in cold weather or when it’s raining. Here are some of the reasons why car windows fog up inside when parked:

  1. Passengers exhaling: When people breathe, they release moisture into the air. If the passengers in the car are exhaling, the moisture will condense on the windows when it comes into contact with the cold glass.
  2. Rainfall: If you park your car outside during rain, the temperature inside the car will be higher than the outside temperature. This will cause condensation to form on the inside of the windows.
  3. Using a car heater: If you turn on the car heater when it’s cold outside, the temperature inside the car will increase, causing condensation to form on the windows.
  4. Sweat or heat: If the passengers or driver are sweating or if there is a lot of heat in the car, the moisture will condense on the windows, causing them to fog up.

Solutions to Fix Foggy Car Windows Inside When Parked

There are several solutions to fix foggy car windows inside when parked. Here are some of them:

  1. Crack the windows: If you want to sleep in the car, crack the windows to allow outside air to enter the cabin. This will prevent your breath from reaching the dew point and causing condensation on the windows.
  2. Run the air conditioner: If you don’t want to crack the windows, you can run the air conditioner to remove the moisture from the air. However, do not leave the engine and air conditioner running while sleeping as it can be dangerous.
  3. Park in a garage: If it’s raining outside, park your car in a garage to prevent condensation from forming on the inside of the windows.
  4. Turn off the car heater: If the car windows are fogging up due to the use of the car heater, crack the windows or turn on the air conditioner to balance the temperature inside and outside the car.
  5. Use a defroster: Turn on the defroster and blow warm air across the windshield and windows to clear off the accumulating moisture on the windows.
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