Question about 2001 Jeep Grand Cherokee

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My air conditioning randomly switches vents randomly.

My air conditioning randomly switches vents while driving. It will go from face, to dash to feet, etc. It seems to start when the accelerator is pressed.

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This is cause due to a bad vacuum line open the hood and look for a leaking line, start the engine and listen for hissing sound, this line may be coming off the intake.

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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Hi I have a jeep CHEROKEE renegade 2003. The air condition is working and it's blowing air to the feet and front window screen but it doesn't blow air to the face vents at all not matter how I switch


The most probable cause is that the louwers that should open to allow air in that area is jammed shut. If electronic could be a bad motor, if mechanical cable, bay be gunked up. Do the lever complete its full length of travel or is it resisting and have to be forced?..

Dec 27, 2013 | Jeep Cars & Trucks

2 Answers

Ac only comes out of defrost and floor vent, not dash


The ducts have dampers that work off of a vacuum and control the flow of air to the different air vents at the top, bottom and face of the dash. Sometimes the vacuum lines come loose or break. You'll need to look under the dash to see if any of these conditions exist.

Aug 15, 2013 | 1993 Chevrolet S-10

1 Answer

Odyssey air conditioning


HVAC Vent Doors under the dash- need to be diagnosed
One is not operating- to switch the air flow
HVAC Vent Door Motor or Vacuum Motor
which ever type you have

Jul 18, 2013 | 2005 Honda Odyssey

1 Answer

Can't get the switch for the air to turn over to heat and can only get air to blow out of one vent


Could the the control on the dash, or a stuck blend door under the dash.

Aug 23, 2012 | 2000 Nissan Sentra

1 Answer

AC is only blowing through the defrost vents in the dashboard?


I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

Jul 26, 2012 | 2003 Chevrolet Tahoe

1 Answer

My air conditioning will not blow out the front vents but blows out the floor


Check vaccume lines under hood / rotted & under dash listen for air sounds. switch on dash may also have a leak. when switching do you hear movement of vent doors..

Mar 13, 2011 | Chevrolet TrailBlazer Cars & Trucks

2 Answers

The air conditioning does not blow through front vents but through windshield vents, what is the problem?


This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

Oct 25, 2010 | 2003 GMC Safari

1 Answer

Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

Apr 04, 2010 | 2004 Jeep Grand Cherokee

1 Answer

When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

Jul 19, 2009 | 2005 Jeep Wrangler

2 Answers

No air, ac, heat out of in dash face vent


check the hoses connected to the vacuum advance ball, it has probably begun to decompose...

Aug 05, 2008 | 1996 GMC Jimmy

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