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Old 07-12-2010, 04:52 PM   #1
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Air conditioning vent issues

No matter what position my control lever is in, my a/c only blows out of the defrost vents. This causes my windshield to fog up on hot days. Any ideas??? 1997 TJ with 4.0 and 5 speed

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Old 07-12-2010, 04:53 PM   #2
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Vacuum leak.....

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Old 07-12-2010, 05:15 PM   #3
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11th post on this in the last week....nice.

Welcome to the forum bud.

Vacuum leak is correct. Defrost is the default setting for a vacuum leak in the system.

Start by popping the hood and checking all the vacuum lines for cracks or damage.

But first pop your hood and look here...most common location....
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Old 07-12-2010, 05:32 PM   #4
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distortedtj is correct. In the pictiue you see two connections on coming from the left and one from the right. The one from the right (going forward from firewall) is the one that controls the cruise and the A/C. It has a very small plactic line coming off. It goes up to a vacume (small and fragile) and the line goes over and across the firewall behind the battery.

I had the same issue, but it was just the 90 degree that popped off.
Good luck.
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Old 07-12-2010, 07:01 PM   #5
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Sorry to be a newbie but I did search the threads for this first. Thanks for the quick response.
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Old 07-12-2010, 07:21 PM   #6
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Quote:
Originally Posted by yoda View Post
Sorry to be a newbie but I did search the threads for this first. Thanks for the quick response.
No worries bud, We don't bash members on this site.

I just found it a little amusing. In the summer it's "my a/c only comes out the defrost" and all winter long it's "my heat only comes out the defrost".

VERY common issue. Just a vacuum leak.

Let us know what you find.
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Old 07-12-2010, 07:29 PM   #7
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Actually, I have re-searched the threads and found people with the exact same problem. Now I feel like a dumbass but at least I have a place to start. I like the top down approach but since my wife drives a land rover (insert nasty comment here) I like all the jeeps functions to work. Again, thanks for the advise and I will keep you posted on the progress.
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Old 08-07-2010, 10:09 PM   #8
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Outstanding guys. using your picture above I traced my vacuum problem. In my case for 2003 wrangler, I traced the line above back towards the fire wall and across the engine. Had to remove the battery and battery plate and there it was. vacuum line had split and come loose. Some electrical tape and now the vents work properly. Thank You, Thank You, Thank You.

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