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Old 05-15-2019, 05:57 AM
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Air direction

Hello everyone im new here and hoping to figure out this snafu in my 2003 jeep, wrangler 4.0. Problem im havin is when i have the fan selection switch set at position to blow air in my face,it will change direction to floor,then window,seems to get stuck in those 2 positions, then itll come back through front ,and repeat. The climate box i changed about 5 years ago,brand new, rackin my brain on where to look,any help of suggestions is much appreciated thanks guys!!

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Old 05-15-2019, 06:14 AM   #2
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Old 05-15-2019, 08:31 AM   #3
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99% of the time it's a loose or cracked vacuum line. Mine always crack at the T where it goes into the firewall and where it connects above the manifold.
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Old 05-15-2019, 09:02 AM   #4
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Vacuum hose as the Boogieman said is the most likely source. Odds are your othe vacuum lines are getting brittleness as well
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Old 05-15-2019, 03:48 PM   #5
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I've experienced somewhat of a similar problem, but only randomly in the dead heat of Summer.

A couple times a year, during the really hot days of Summer, my vents will default to the defroster, just like there's a vacuum leak. I was thinking something is expanding due to the extreme heat and creating the failure. Sometimes it will stay defaulted for a few days, other times it will correct itself by the next morning; even though the high temperatures remain.

I've gone over every vacuum line and T under the hood with a fine tooth comb and come up with nothing visible. As far as tracing under the dash, I've not gone there yet, with exception of pulling the HVAC module out and checking the vacuum connecter on the back.

I've also read that when this vent default happens due to a failed vacuum line, chances are the cruise control will not engage either, since it runs off the same vacuum line. But my CC works fine when the vents have defaulted.

I changed the whole HVAC module about 2 years ago due to a fan speed switch failure, but I haven't ruled the module out. Just not ready to spend another $140 unless I know for sure. And the fact that it happens so infrequently gives me pause.

To the OP: As TheBoogieman suggested, 99% of the time it's a vacuum line or T.
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Old 05-16-2019, 09:05 AM   #6
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Just case you need vacuum tracing later.
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Old 05-16-2019, 09:09 AM   #7
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Just case you need vacuum tracing later.
Hmmm. That looks exactly like the picture I posted.
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Old 05-17-2019, 08:32 AM   #8
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@TheBoogieman the vacuum diagram was saved in my computer Wrangler toolbox so it may well be one you posted. I just don’t know but it sure is very helpful. If you posted it a big thanks for doing so. I’ve used a couple of times to trace rpm and ventilation problems. It sure helps avoid overlooking a broken hose.
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Old 05-18-2019, 05:36 PM
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Thanks you guys wow i do appreciate all the input ,this is driving me nuts,ill be driving at roadspeed and the front vent air just disappears to the floor of window. Im goin to order a climate control box see if that makes any difference. Got the diagram thanks alot,going to study it up and keep you updated on the result.again thanks for all the help.
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Old 05-18-2019, 05:58 PM
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Ive saved the diagram,i see the parts are numbered,what is the number 8 piece, is that under the battery? Looks like vac lines travel under battery ,but cant see where they end up.im pulling battery out tomm morning to have a look see.
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Old 05-18-2019, 06:00 PM
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[QUOTE=Boobytrap;34338749]Thanks you guys wow i do appreciate all the input ,this is driving me nuts,ill be driving at roadspeed and the front vent air just disappears to the floor or window. Im goin to order a climate control box see if that makes any difference. Got the diagram thanks alot,going to study it up and keep you updated on the result.again thanks for all the help.
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Old 05-19-2019, 08:02 AM   #12
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Ive saved the diagram,i see the parts are numbered,what is the number 8 piece, is that under the battery? Looks like vac lines travel under battery ,but cant see where they end up.im pulling battery out tomm morning to have a look see.
Line connects to vacuum reservoir under the battery tray. I had to remove my battery and tray to reach mine on my 03'.
Engine vacuum is stored in the vacuum reservoir. The stored vacuum is used to operate the vacuum controlled vehicle accessories (A/C, cruise control) during periods of low engine vacuum such as when the vehicle is climbing a steep grade, or under other high engine load operating conditions.
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Old 05-19-2019, 08:08 AM   #13
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Thanks you guys wow i do appreciate all the input ,this is driving me nuts,ill be driving at roadspeed and the front vent air just disappears to the floor or window. Im goin to order a climate control box see if that makes any difference.
It's the vacuum line. My AC quit everytime I stepped on the gas and returned as soon as I let off. I couldn't find the crack on my Rubicon line until I twisted the line near the firewall T (circled in picture) and it broke.
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Old 05-19-2019, 12:56 PM
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EUREKA!!! Through all your good advice ,i found a cut in the line thats most probable ,the T line that routes into firewall,i will drive and test today,i cut the line and had a boot connector thats tight bridge them,so we shall see,if its not the culprit, this is at least progress towards elimination one at a time. I will update if this did the trick,although in my experience, nothing is this easily solved for me,i always seem to get the problems that is costly or is baffling to a mechanic.fingers crossed!!!
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Old 05-19-2019, 07:27 PM   #15
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The suspense is killing me.
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Old 05-19-2019, 07:29 PM   #16
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EUREKA!!! Through all your good advice ,i found a cut in the line thats most probable ,the T line that routes into firewall,i will drive and test today,i cut the line and had a boot connector thats tight bridge them,so we shall see,if its not the culprit, this is at least progress towards elimination one at a time. I will update if this did the trick,although in my experience, nothing is this easily solved for me,i always seem to get the problems that is costly or is baffling to a mechanic.fingers crossed!!!
You might want to tape it also, if it isn't really tight. I just had to do that on my XJ to fix the AC.
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Old 05-20-2019, 02:43 PM
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BINGO!!! after alot of lookin and proddin and pullin,by accident checked over that famous problem T vacuum that routes through firewall, i had just pulled on that vac line the right way to reveal a cut. As i noted earlier i then cut that line and fixed up a boot to bridge em. And to my high hopes this indeed solved my issue of the air direction default to defrost. Because god only knows what I was preparing to do in order to remedy this most annoying and inconvenient malfunction. I live in texas too hot for this baloney.
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Old 05-20-2019, 03:34 PM
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Thanks boogieman and you guys whi added some suggestions, kept me lookin and didn't give up!! Much appreciated
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Old 05-20-2019, 03:36 PM
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Anybody know how to go back and edit your submitted??
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Old 05-21-2019, 02:37 AM   #20
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Anybody know how to go back and edit your submitted??
This site doesn't let you edit (unless you do it quickly after posting) or delete posts.
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Old 05-21-2019, 02:53 AM   #21
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You have to have 15 posts and then have 24 hours to edit. If it is critical, not just nice, you can contact a moderator and have them edit it for you.
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Old 05-21-2019, 09:26 AM
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Air directio

Thanks i prefer to spell correctly lol
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Old 05-21-2019, 09:33 AM   #23
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Thanks i prefer to spell correctly lol
Me two.
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Old 06-28-2019, 12:14 PM
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No brake light

Hey everyone got a new problem 2003 jeep wrangler have blinks,running light,but no brake light when pedal depressed,any ideas?
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Old 06-29-2019, 06:41 AM
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Tranny

Want to change my own trans fluid, do i have to drop the pan? And how many quarts does it take??
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Old 06-29-2019, 08:37 AM   #26
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Hey everyone got a new problem 2003 jeep wrangler have blinks,running light,but no brake light when pedal depressed,any ideas?
Likely the brake light switch, which is a plunger type on top of the brake pedal connecting arm under the dash. May be stuck closed. Start with the fuse though. Can't recall what else is on the brakelight fuse offhand, owner's manual should tell you what and which one it is.
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Want to change my own trans fluid, do i have to drop the pan? And how many quarts does it take??
Auto or manual? Assuming auto, and yes the pan has to drop because the filter is inside. You can save a ton of hassle/mess for your next change by either getting a pan with a drainplug installed or installing one yourself, you'll have to google or search for how to do that.
If manual, should be a drain plug on the bottom and a fill plug about halfway up on the driver's side. Don't drain until you know you can get the fill plug out.

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Old 06-29-2019, 08:58 AM   #27
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Boobytrap, let Bobnh et al know if his solution worked. That’s immediately what came to mind for me when you said bulbs were working but no brake lights when pedal depressed. You may have knocked the switch wire loose and you can do a simple circuit (on/off) test of the switch in place before buying a new one.
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Old 06-30-2019, 08:09 AM
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Brake light

Sho nuff. Was brake switch. #2 fuse checked out. Thanks guys ,any amateur can change it out took me ten min.just have to adjust the pole switch by pullin out or push in to meet requirements of brake lever. For anyone havin same issue. ALSO i had asked about tranny change,sorry i didn't mention auto. I will look into that pan with drain feature. Looks like an absolute mess to change,will need plastic as well as collecting pan no doubt.
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Old 06-30-2019, 08:15 AM
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Brake light

Thanks bbhno and gisgwa
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Old 06-30-2019, 12:18 PM   #30
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Thanks bbhno and gisgwa
Glad it worked out! Mine failed on in my TJ, turned out the switch had broken from the mount. Zip tied it in place until I could get a new one and ended running with it like that for 8 more years lol

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