Question about Dodge Avenger

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When I turn the selector to defrost my windshield the air conditioning button light comes on. I can also tell the air cond compressor coming on at the same time. Does anyone know of any fixes?

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  • Dodge Master
  • 8,140 Answers

Hi, this is normal operation of the system. The defroster uses the A/C to remove moisture from the air. Please let me know if you have more questions, and thanks for using FixYa.

Posted on Jan 02, 2011

  • raycarrol484 Jan 02, 2011

    thanks but isn't that a stupid design? I get warm air to defrost and cool air from the vents. I'm also worried about the mileage since the compressor seems to come on.

  • Jeff Turcotte
    Jeff Turcotte Jan 02, 2011

    You should not be getting any cool air unless you are using a bi-level setting. With the unit set to defrost, all of the air should be going through the heater core and none should come out of the front vents. If it is, your doors are not operating properly. Can you tell me your model and year?

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Is the heater control in the defrost position? Most cars will automatically turn the air conditioning compressor on when defrost is selected to dehumidify the air being directed on the windshield. This keeps the windshield from fogging up, and helps defog the windshield more quickly if it is already fogged up.

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Yes it does.
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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

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I may be able to help but, I need some more information. When you turned on your A/C what was the vent selector set at (Floor, Face, Defroster)?

Most newer cars with A/C systems have a built in setting when you set your vent selector to Defrost mode (blowing on the windshield) that automatically turns on the A/C unit. This is normal due to the fact that a fogged up windshield is from water vapor and the A/C does an awesome job of drying the air so it can more effectively and quickly remove that annoying water vapor from your windshield so you can see better while driving.

Try changing the vent selector to full face vent (the vents from the dashboard that you can adjust) and switch on/off the A/C and see if that solves your problem.

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