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Old 12-12-2008, 08:02 AM   #1
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Windshield Defrost Vent Not Working

I was driving home in the rain last night, and I discovered that no air comes out of my windshield defrost vent. Air still blows out of the side vents that are supposed to blow on the windows, just not this center vent. Any Ideas?

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Old 12-12-2008, 08:13 AM   #2
Really?

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Just a thought, but is your gas mileage suffering too? There's a vacuum line on the manifold just under the throttle body that controls the door for the heater control. It tends to pop loose and the door that routes the air from either vent to floor to defroster inside the heater / air conditioner box under the dash becomes in-op.

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Old 12-12-2008, 11:32 AM   #3
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Thanks ccain, but that was the problem last year. This time the defrost still works its just that center defrost vent that goes behind the radio.
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Old 12-12-2008, 05:02 PM   #4
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Likely the lever for one of the doors in the vent system is broken,To check it pull the panel below the steering wheel & the metal plate behind it then you will be able to look up and to the right of the gas pedal you will see 3 vacuum actuators as you switch the vents to different positions you will see them move,If they are not moving at all check the black hose under the hood it comes out near the heater hosed and connects to a vacuum source at the engine,If one of the levers is broken you may be able to see it or the lever can appear ok but is not turning the door,Replacement Levers are available from 4x4 Parts-4x4 Accessories-4WD Parts-Jeep Accessories-Jeep Parts-4WD-4x4 Truck : Tellico 4x4
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