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.
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.
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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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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