Maximaboy1 Posted September 18, 2004 Share Posted September 18, 2004 How come when I turn on the heater (Crank up the temp to 80ish, and press auto) the A/C light is still on? Blows warm as it should, but just curious. Quote Link to comment Share on other sites More sharing options...
Spongebob Posted October 14, 2004 Share Posted October 14, 2004 I believe that is to pull the moisture out of the air to reduce condensation from the heat, assuming that the air outside the car is cooler and the inside warmer , causing a build-up on your windows. Just like if you run your heater in the winter and moisture will not leave the interior of the car without the A/C conditioning the air in the car, even though the air is warm/hot. Quote Link to comment Share on other sites More sharing options...
Maximaboy1 Posted January 4, 2006 Author Share Posted January 4, 2006 How does the A/c pull the water out of the air? Quote Link to comment Share on other sites More sharing options...
teelias Posted January 11, 2006 Share Posted January 11, 2006 How does the A/c pull the water out of the air? The temperature of the condenser (mounted in the heater box) causes moisture to condense on it and run out underneath your car. That is why when you are in Phoenix, very little water, but in Florida, running out constantly. Quote Link to comment Share on other sites More sharing options...
lexusman400 Posted January 14, 2006 Share Posted January 14, 2006 The thermal temperature change across the evaporator creates a bond between the hydrogen and oxygen atoms, hence condensation that exits the system under the car. What is left is a suitable dewpoint inside the car. Quote Link to comment Share on other sites More sharing options...
MitchB Posted January 16, 2006 Share Posted January 16, 2006 How come when I turn on the heater (Crank up the temp to 80ish, and press auto) the A/C light is still on? Blows warm as it should, but just curious. But, to answer your question, the A/C button is used to "enable" the air conditioning. If you set the temperature to 80 and it's colder than 80 degrees in the car, it will run the heat. If the temp should somehow get too warm (say it's real sunny on a warm day), then the compressor will come on and cool the car interior. If you have the A/C light OFF, you can't cool the car. The A/C light will be go ON anytime you set your climate control to AUTO so that the temperature inside the car will be maintained at the setpoint, regardless of whether you need heat or air conditioning. AND, like the others have said, the air conditioning comes on to defog the windshield. Quote Link to comment Share on other sites More sharing options...
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