Question about 2008 Hyundai Elantra

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When manual climate control of my 2008 Elantra is switched to defrost mode the A/C goes on. .Why is this happening?

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Your air conditioner comes on to dry the air in defrost mode. It clears the window and removes the moisture (humidity) that is causing the windows to fog up in the first place.

Posted on Feb 16, 2016

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To put it simply, your mode doors are not swithching modes - the reason for this can vary depending on which system you have.

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If your Maxima is equipped with Automatic climate control, you must put your control unit into self-diagnostic mode, then follow the troubleshooting chart for whichever fault code is output by the climate control unit. (most likely a mode control motor fault)

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The switch must be tested first, then the wiring between the switch and the motor. If these things check good, then the motor should be replaced.

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Here's the wiring diagram of the manual AC controls. I suspect the problem is in the 'mode' switch/motor.

47fdc72.jpg

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