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Old 06-16-2010, 07:05 PM
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A/C only coming out of defrost vents

I'm sure this has been been discussed before, but I could not find anything using the search. I am new to this forum as of today.

My A/C in my 2000 Grand Chereokee blows cold, but only out of the defrost vents..... no matter where I have the position selected. Does anyone have a suggestion of what the problem may be. Do you think the Blend Door Actuator needs replaced?

Thanks in advance for your help.
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Old 06-16-2010, 07:10 PM
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Re: A/C only coming out of defrost vents

the defroster is the default to any failures in the system
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Old 06-16-2010, 07:30 PM
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Re: A/C only coming out of defrost vents

blend door is the most common
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Old 06-16-2010, 07:43 PM
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Re: A/C only coming out of defrost vents

Quote:
Originally Posted by Scottina06 View Post
blend door is the most common
x2 sounds about right
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Old 06-16-2010, 08:07 PM
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Re: A/C only coming out of defrost vents

Quote:
Originally Posted by Scottina06 View Post
blend door is the most common
As in you think the blend door is physically broken. Do you think the actuator is working, but blend door itself is physically broken?
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Old 06-16-2010, 08:23 PM
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Re: A/C only coming out of defrost vents

in my old WJ the blend door broken and the air would only come out of the defroster. i traded in the jeep before ever fixing it. there is a replacement on ebay but i cant remember the name of it. it replaces the junk plastic parts that jeep used with metal parts. u have the remove the glove box and dash to install it i think.
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Old 06-16-2010, 10:24 PM
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Re: A/C only coming out of defrost vents

If the problem is that hot or cold air only comes out of the defrost vents, the problem is the mode door. The blend doors only take care for mixing hot and cold air. Which system your WJ has, the manual system or the automatic one. In the manual system the mode door actuators are vaccum controlled, but in the automatic system (with the dual zone control) the mode doors are electrically controlled. For the last system you can find here below how to get the fault code(s) out of it. Because the list of codes is quite long, i won't put it here, but just let me know what you find and i can tell it to you.




ENTERING THE AZC SELF-DIAGNOSTIC MODE
To enter the AZC self-diagnostic mode, perform the
following:
(1) Depress the a/c and recirc buttons at the same
time and hold. Rotate the left temperature control
knob clockwise (CW) one detent.
(2) If you continue to keep the a/c and recirc buttons
depressed, the AZC control module will perform
a Segment Test of the Vacuum Fluorescent (VF) display.
In the Segment Test you should see all of the
display segments illuminate as long as both buttons
are held. If a display segment fails to illuminate, the
vacuum fluorescent display is faulty and the a/c
heater control must be replaced.
(3) After viewing the Segment Test, release the
A/C and Recirc buttons and the display will clear
momentarily.
If a 0 is displayed, then no faults
are set in the system.
Should there be any faults,
either
9current9 or 9historical9, all fault codes will be
displayed in ascending numerical sequence (note no
effort is made to display fault codes in chronological
order). Each fault code is displayed for one second
before the next code is displayed. Once all fault codes
have been displayed, the system will then repeat the
fault code numbers. This will continue until the left
side set temperature control is moved at least one
detent position in the CW direction or the ignition is

turned
9OFF9.
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Old 06-16-2010, 10:41 PM
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Re: A/C only coming out of defrost vents

Frango100, thanks for your response. I do not have the dual zone control system. So I am assuming I have the manual system. Your instructions on getting the fault codes are not applicable to my system. I do not have a recirc button. Recirc is actually one of the selctions on my round knob (the knob that selects recirc, dash vent, floor vent, defrost, etc.).

With this information, could you provides some additional advice?

It would be very much appreciated.

Thanks
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Old 06-16-2010, 11:00 PM
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Re: A/C only coming out of defrost vents

Check all your vacuum lines for a leak and pay real close attention to those on the drivers side of the engine compartment.
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Old 06-17-2010, 01:17 AM
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Re: A/C only coming out of defrost vents

Quote:
Originally Posted by Joe in PA View Post
Check all your vacuum lines for a leak and pay real close attention to those on the drivers side of the engine compartment.
............now i remember the problem in my WJ i had a busted vacuum line. i replaced it and it worked good for over a year. then the actual doors broke and i left it broken until i traded it in to the dealer.
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Old 06-17-2010, 11:55 AM
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Re: A/C only coming out of defrost vents

I have no experience myself on the manual system, what i tell you i just red in the WJ service manual. But as the other guys already mentioned, the problem can be a broken or disconnected vacuum hose in the engine bay or at the cabin side. You could remove the heat/airco control panel and find all the vacuum hoses connected to the mode switch. Attached a schematic for which hose is for what. I would first check if vacuum is available at the switch by disconnecting the vacuum line for the vacuum supply. If this is ok, you have to go to the vacuum valve. Maybe someone else could guide you how to get to tis valve.
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Old 06-17-2010, 12:05 PM
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Re: A/C only coming out of defrost vents

here is the improved part it you find it is the door...........

http://cgi.ebay.com/ebaymotors/Blen-...Q5fAccessories

if it is the door you might hear a slight rattle when the jeep is at idle
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