Heat comes from vents when off - JeepForum.com
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post #1 of 16 Old 09-24-2015, 05:20 AM Thread Starter
sevenscrew
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Heat comes from vents when off

If I put my hvac to feet only it also comes out the head vents. And now I have it off and can feel the heat coming out of the vents still


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post #2 of 16 Old 09-24-2015, 05:27 AM
Luke4010
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Is the blower fan still running? Do you have automatic or manual HVAC controls?
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post #3 of 16 Old 09-24-2015, 06:08 AM Thread Starter
sevenscrew
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I think it's auto matic it's a 97. And the blower motor is off. But the part I don't get is when I have it on feet it comes out all the vents but primarily comes out the feet

1997 Limited 5.2L Nelly - SOLD
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post #4 of 16 Old 09-24-2015, 06:05 PM
coralman
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The doors have a foam cover on them that can rot away causing leaks, ATC door travel could be off. If its not too bad I wouldn't worry about it.

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lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #5 of 16 Old 10-05-2015, 07:48 AM Thread Starter
sevenscrew
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Ok no options work actually. I change the vents and no matter what vent I pick it comes out head only .
On the little display it does change but not physically
Bad because I can't defrost windshield and in the summer heat will be coming out even when it's off

1997 Limited 5.2L Nelly - SOLD
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post #6 of 16 Old 10-13-2015, 11:58 AM Thread Starter
sevenscrew
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Bump, would a plenum gasket vacuum leak? Cause this

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post #7 of 16 Old 10-13-2015, 03:45 PM
XJ93
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Not likely that a plenum leak would cause your issue. Sounds more like the control box to me.
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post #8 of 16 Old 10-13-2015, 03:54 PM
kg6mov
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If it was a vacuum leak you would get defrost vents all the time. Do you have the ATC controls? The ATC system has a little LED display, the normal HVAC just has three knobs and an AC button.

1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ 5.9 - Junked
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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #9 of 16 Old 10-13-2015, 07:40 PM Thread Starter
sevenscrew
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I have atc controls

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post #10 of 16 Old 10-14-2015, 07:10 AM
PolkaPower
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The digital auto climate controls are buggy. Bad soldering. That is a known issue with them. Mine used to just stop blowing cold randomly and when I turned it on the next day it worked fine. My ac lines were still ice cold so I knew it was still working.
I ran into a Chrysler tech at the parts store and he suggested that the ATC was bad.

When I pulled the AC codes it just said it was a blend door issue which was caused by the auto controls malfunctioning. Kind of a wild goose chase. If I hadn't ran into that guy I would have pulled the dash apart for no reason to get to the blend doors.

The WJ's are the ones that have the blend door problems. ZJ's not as much.
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post #11 of 16 Old 10-14-2015, 01:08 PM
kg6mov
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ATC is all electronic, no vacuum, and generally sucky.

1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ 5.9 - Junked
1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #12 of 16 Old 10-15-2015, 11:09 AM Thread Starter
sevenscrew
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Thanks guys I'll be replacing it definitely before winter I need me a defroster lol.
I gave up on the slight rough idle for now I think that's the plenum gasket. My next project is to ez out a stud from my new 231 case and swap it in (VC was shot on 249) and then mess with the rear driveshaft length etc then tighten up the front end. Ball joints upper control arms etc.

Thanks guys

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post #13 of 16 Old 10-15-2015, 12:33 PM
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What do you need to mess with for rear driveshaft length for?
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post #14 of 16 Old 10-15-2015, 12:56 PM
kg6mov
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Must be swapping in a ESY 231.

1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ 5.9 - Junked
1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #15 of 16 Old 10-16-2015, 07:17 AM
XJ93
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Quote:
Originally Posted by kg6mov View Post
Must be swapping in a ESY 231.
Ahh yeah that would need some d.s. work.
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