Question about 1996 Jeep Grand Cherokee

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AC goes through the defroster.

No matter where my slide selection switch is set, the air only comes out of the defroster.

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You have a vacuum leak to your heater controls. Find the leak, and it will fix your problem.

Posted on Aug 05, 2009

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Had no heat at all in my 06 equinox tried everything to fix and no luck. Until I noticed AC pump was turning on and off unplugged it and now have heat. What would cause AC to do that?


The A/C compressor will cycle if the climate controls are set to send air to the defroster vents, or if the controls are set to an A/C position. Running when on defrost prevents fogging. What is most likely your issue is that the blend door in the heater box is not shifting over completely to the heater core, thus you are getting the colder A/C air rather than the heated air. You could also have a kinked heater hose or partially clogged heater core.

Jul 25, 2016 | AC Cars & Trucks

1 Answer

Air blows out all vents no matter where it is switched to heat or ac defrost, floor


its called the blend door actuator
its either stuck or or broken or shorted out it is deep in behind the dash located inside the air box where the heater core is and the ac condenser is its a fun job as for you have to rip your dash apart

May 18, 2013 | 2006 Kia Sorento

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

94 deville concours ac works sometimes then u here duct door close and digital climate temp numbers go to blank dashes and defrost comes on and is stuck wont turn off then digital numbers come back on


My first guess would be a wiring problem or the controller.
If anything goes wrong with the system, it will default to the defrost mode for safety.

Jul 10, 2012 | Cadillac Cars & Trucks

1 Answer

Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.


The HVAC mode selections on these are controlled by an electric stepper motor that receives commands from the BCM (body control module). The BCM decides where the air door should be by looking at where the dash control input is.
Each mode selected has a different resistance level. From low resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost, with Defrost as the highest resistance (~100K ohms). A high resistance or open circuit would probably default the system to defrost no matter what position the mode control was set to.
If the control is dirty or there is a connection issue, this could cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The system can be reset and recalibrated with a battery disconnect, this will also erase any fault codes.
I would start by looking at the dash mode control.

Good luck, i hope this helps.

Jun 28, 2011 | 2006 Chrysler PT Cruiser

1 Answer

Ac only blows through the defrost vents no matter what the controls are set to the air only comes out the defrost vents.


the blend air door is stuck look down the heat vents to see if something fell in there

Jul 11, 2010 | 2004 Dodge Dakota

1 Answer

My AC air registers only have air coming out of the defrost ducts


In every car, there are fins or flaps inside the dash that rotate that distributes the air flow from the blower to the desired opening, ie defrost, floor etc... This flap is controlled by a linkage which is connected to the selector switch. It may be the linkage is no longer connected, or the fins inside the dash are stuck. If the selector switch moves freely with little or no resistence its possible the linkage is no longer connected, otherwise the flaps need to be physically looked at.

Aug 09, 2009 | 1989 Ford F 150

1 Answer

When i turn on high beams sometimes my lights just go off. I then just keep flicking switch until lights come back on, 2003 impala. I also am having a problem with my selector switch that controls my...


the turn signal/multifunction switch is defective, the other problem is a vacuum loss at the AC mode control switch or the vacuum switch itself (part of the AC control in dash), check the vacuum resovior under the hood gfor leaks and make sure the vacuum reaches the switch in the dash.

Jul 28, 2009 | 2003 Chevrolet Impala

1 Answer

Air conditioning


You need the AC mode/function switch to be replaced, it controls the different modes the AC/Heater are set to and where the air goes within the air ducts..

Jul 27, 2008 | 1997 Chevrolet Lumina

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