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2006 Chrysler pacifica air conditioner is not blowing in back vents

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Air conditioning facilitates the removal of heat from inside the vehicle. The principle applied is that the heat is removed by the method of conduction and convection. An evaporator which is cold absorbs the heat from the air that is passed through it; cold air is then forced out through the vents inside the car by the blower motor . This is done by pressurizing refrigerant (134a) with a compressor and then releasing refrigerant (134a) inside the air conditioner evaporator. The causes for air conditioner not blowing air from back vents are.The vent door must not be getting opened or the back vent door motor is not functioning.Or the leak in the vacuum line at the back or blockage in the vacuum line at the back vent. Temperature Control Vents - The vents inside your car are controlled by a cable, electrical servo or vacuum servo. If the vent door is not functioning properly it will cause warm air from the heater to exit the vents. To check this start the car and allow the engine idle, next turn the blower motor speed on low,switch the temperature control from warm to cold while your ear is close to the vents. You should hear the door move inside the heater box as it swings from open to close. If not, inspect for a vacuum leak or a shorted motor in the servo, repair the leak or replace the servo motor. ---- Also check the vacuum hose and vacuum line. you may have a vacuum line loose some where or a leak in one. If you check under the hood you should see two small line running into the fire wall from the intake plenum. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 11, 2010

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2004 pacifica ac/heat works sometimes, back vents blow always but not heated or cooled air


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