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Unread 06-30-2004, 07:08 PM   #1
overseer
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Heater/air control will not change vents

I have a 96 Jeep grand Cherokee. The heater is stuck on defrost all the time and I cannot switch to any other vent modes. (If I try to turn the air on from defost, nothing happens) Has anyone had this problem? If you have please help me. It is hot out and we and we are melting.

Thanks

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Unread 06-30-2004, 07:19 PM   #2
driabyor
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a vacuum problem,, switch on dash ,, bad hose ,, bad vacuum motor... door stuck......
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Unread 06-30-2004, 07:23 PM   #3
Dalmask
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With a Haynes manual and a vacuum tester, you can at least eliminate a couple of the possibilities.

-Dal
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Unread 06-30-2004, 07:47 PM   #4
77'cj7
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Go to the stealership, they will sell you a little plastic part u have to splice into the system. It solves a vacuum problem, i think. Worked on dads 94 zj.
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Unread 07-02-2004, 09:38 AM   #5
overseer
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Thanks

Quote:
Originally Posted by 77'cj7
Go to the stealership, they will sell you a little plastic part u have to splice into the system. It solves a vacuum problem, i think. Worked on dads 94 zj.

I just wanted to say thanks for everyone's help and advice on this. I notice that alot of people do not take the time to do this. I will give these a try. If you guys run into trouble I will be there to help
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Unread 07-02-2004, 03:14 PM   #6
overseer
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update

At looking at the Automatic climate control, I have also noticed that the little guy that shows you where the vent is supposed to go is missing no matter what vent you switch it to.

Does this give anyone any ideas??
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Unread 07-02-2004, 03:23 PM   #7
97grand
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Have you put the ATC head through the self-check mode? Here's the procedure. It's really easy to do...

With the Climate Control off, press both the AC and RECIRC buttons.

While holding them in, turn the temp knob one click clockwise.

The display will light up with all icons.

Release both the AC and RECIRC buttons, and then press one of them. Doesn't matter which.

A "driver" icon will show, with 2 digit codes listed, 00 being no fault.

A code of 25 or 29 is bad. New ATC head unit.

Mine was a 23, meaning a problem with the blend door actuater. That sucks. The whole dash has got to come out to access it. $$$$$$$!
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Unread 07-02-2004, 09:11 PM   #8
10achik
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This same issue happened to me not long ago, and I had accidently disconnected a vaccum hose while changing the plugs. See if you can find any loose hoses dangling around. Be sure not to look between your legs J/k

Seriously thats what my problem was.
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Unread 08-29-2004, 06:29 PM   #9
overseer
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Error codes - 40 and 51

I tried this out and got codes 40 and 51. Any ideas on what this means?


Quote:
Originally Posted by 97grand
Have you put the ATC head through the self-check mode? Here's the procedure. It's really easy to do...

With the Climate Control off, press both the AC and RECIRC buttons.

While holding them in, turn the temp knob one click clockwise.

The display will light up with all icons.

Release both the AC and RECIRC buttons, and then press one of them. Doesn't matter which.

A "driver" icon will show, with 2 digit codes listed, 00 being no fault.

A code of 25 or 29 is bad. New ATC head unit.

Mine was a 23, meaning a problem with the blend door actuater. That sucks. The whole dash has got to come out to access it. $$$$$$$!
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