Question about 1998 Jeep Grand Cherokee

1 Answer

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

Posted by on

  • 1 more comment 
  • 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.

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 28 Answers

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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
God blessss

Jul 14, 2014 | 2000 Buick Regal

Tip

Tips for operating Air conditioning system on Toyota Hilux and someother...


To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

2 Answers

AC fan blows less air after extended use


Sounds to me the blower motor is on it's way out and should be replaced. Even though they sound like there working doesn't mean everything is ok with it there are different parts on it that could go wrong and they way to fix it is with another blower fan and not a bad idea to do the resistor at the same time located in the blower box with about 4 wires coming out of it with one or two screws holding it in place all is located under dash behind the glove box area.

Aug 03, 2012 | 2002 Dodge Grand Caravan

1 Answer

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.
You have one or more blend doors that open and close to direct air flow thru the vents. If there is a problem, the default position is defrost for safety.
A mechanic would check the blend doors for voltage and operation.

Jul 09, 2012 | Ford Taurus Cars & Trucks

1 Answer

Bucking when O.D. at 45-55mph


I'm not certain about your vehicle, but you may be describing a problem with your automatic transmission's lock-up torque converter. Modern torque converters have a mechanism that locks up at highway speeds for a 1-1 coupling between the engine and transmission, providing better mileage. The lock-up sequence is programmed into the computer, and it is supposed to come on automatically at a certain speed and engine condition and come off when the speed is reduced or other particular conditions are met. Your problem could be that your lock-up converter is either failing to unlock due to a mechanical problem, or that it is being mis-commanded due to a bad sensor or similar problem.

Find a transmission specialist in your area.

Dec 11, 2010 | 2001 Ford F150 Styleside SuperCrew

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.

May 31, 2010 | 2004 Ford F150

1 Answer

2001 Jeep Cherokee a/c blows defroster only, no cruise control


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.

Apr 27, 2009 | 1995 Jeep Grand Cherokee

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.

Oct 21, 2008 | 1999 GMC Safari

Not finding what you are looking for?
1998 Jeep Grand Cherokee Logo

Related Topics:

357 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...