[Z06] somethings wrong
Pro
Joined: Jul 2003
Posts: 645
Likes: 1
From: Hillsdale NJ
I don't think you can override the defroster issue as it helps in removing moisture. The heater one is an easy work around using the meory setting and the temperature.
Learn how to get around things by working it out.
Learn how to get around things by working it out.
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Advanced
Joined: May 2004
Posts: 81
Likes: 0
From: Fountain Valley CA
Dee-Fog
The reason the AC is designed to come on for defog is as follows:
The amount of water vapor that air can hold is greater as the temperature increases. "Dew Point" reflects the temperature at which the air, with a given amount of water would be unable to hold any more water. This would be 100% relative humidity. "Dew Point", when compared to temperature is an indicator of how close the air is to being "saturated", or holding as much water as possible. If the temperature and dew point are very close, the air is moist. Warm moist air contacts cold glass and causes the temperature to drop to the "dew point". As the temperature decreases, the moisture "condenses out" of the air, as the dew point can't be higher than the temperature. The AC system lowers the temperature and wrings the moisture out of the air. When the air is then heated, it has less moisture, as some of the water in the air has been removed. Hot dry air is better for defrost or defog than moist air at the same temperature. The sole purpose for cooling the air is to get rid of some of the moisture. Defrost, hot and dry is best.
The amount of water vapor that air can hold is greater as the temperature increases. "Dew Point" reflects the temperature at which the air, with a given amount of water would be unable to hold any more water. This would be 100% relative humidity. "Dew Point", when compared to temperature is an indicator of how close the air is to being "saturated", or holding as much water as possible. If the temperature and dew point are very close, the air is moist. Warm moist air contacts cold glass and causes the temperature to drop to the "dew point". As the temperature decreases, the moisture "condenses out" of the air, as the dew point can't be higher than the temperature. The AC system lowers the temperature and wrings the moisture out of the air. When the air is then heated, it has less moisture, as some of the water in the air has been removed. Hot dry air is better for defrost or defog than moist air at the same temperature. The sole purpose for cooling the air is to get rid of some of the moisture. Defrost, hot and dry is best.