Question about 1998 Jeep Grand Cherokee

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Air conditioning only comes on in the defrost area and not in the other areas particularly when accellerating speed.

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  • vanessa00 Jul 06, 2008

    it the same promblem

  • kymlin Jul 09, 2008

    Have had similar problem found vacuum line off to servo under dash.

  • bronsondamer Jul 16, 2008

    My Jeep does the same, and I have yet to figure it out. I've gotten into the dash and tried to find the other A/C lever that moves the doors, but can only find the one that moves the vents to the floor. (That lever is on the drivers side under the bottom right-right by the accelerator) I also checked the vaccum hoses just to make sure there wasn't a problem with the pressure in the system. Still can't figure it out. If I could find that other lever (I think its right behind the radio) then mabye I could fix it.


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Look under the hood for a loose or broken vacuum hose and replace it and it will work fine, this is a vacuum hose problem due to the fact that is more visible when you accelerating......

Posted on Aug 15, 2008

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1 Answer

Why is air coming from all three areas (vents/floor/defrost) regardless of setting?

There is actually two blend door actuator that control the opening and closing of your vents. Ine is located under the drivers side dash board. The is on the passengers side. Both are electric and I didnt have the money to replace them so i removed them and turned it with a pliers to allow heat to come out of bothe sides of the vent. Then come summer flip the little bar back the other way to A/C
Hope this helps
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I have a 2003 Ford Taurus and the A/C only will come out of the defrost area of the front window. It wont lwet me choose feet area or face area just defrost.

Sounds like a wiring problem with the harness behind the dash.
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1 Answer

Air conditioner doesn't blow from right vents. keeps alternating from top to bottom to face vents on its own, most changes occur during acceleration.

The air/duct controls on this are vacuum operated and you most likely have either a leaky vacuum line or a bad vacuum check valve. When the engine is running at a steady cruising speed there will be quite a bit of vacuum in the intake manifold and thus in the vacuum lines and control system. This vacuum is held there by a check valve so when you are accellerating and the intake vacuum drops you won't lose this vacuum. If there is a leak or the check valve is bad then as the vacuum drops the air doors move to the default position which is where the air is directed to the defrost vents. The vacuum line under the hood is usually black plastic and about 1/8" diameter. The line and check valve are on the right side of the intake manifold area towards the rear. I'd start my search there as that's where you'll probably find your problem. Hope this helps!

Jul 14, 2010 | 1999 Dodge Ram

1 Answer

The AC air comes out defrost sometimes and comes

what position is the control switch in? does this occur when accelerating?

the door that directs air flow is controled by a vacuum motor. the default position for the door directs air flow to the defrost vents in the event of vacuum loss to ensure the windsheild will be clear of mist. if there is a small leak, vacuum will temporarily be removed when accellerating and the motor will revert to the default position. there are vacuum lines from the control knob to the motor you must check these lines for leaks. the diaphram in the motor may be bad. also check the main vacuum supply line to the control knob. usually red in color. if there is a vacuum storage cannister. it may be leaking. this cannister will maintain vacuum for the circuit when accellerating. engine vacuum decreases when accellerating.

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1 Answer

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There is a vacuum leak under the hood somewhere. Check the vacuum at the speed control servo. If there is no vacuum on the line with the engine running, follow the line to find the leak. The vacuum reservoir is mounted under the battery tray. I would look in that area after confirming no vacuum at the servo.

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1 Answer

1999 gmc safari van upper vent

Check under the hood for deteriorated small vacuum hose coming off the intake over to the heater box area.
Repair the vacuum hose.

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