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Old 07-11-2010, 01:15 PM   #1
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AC Direction problem,

2003 Sahara.

OK guys like everyone else, my air only blows through the defroster.

I have my dash apart right now, and was checking the switch itself, it has colored tubes /hoses coming from it, red, brown, yellow, green and black. Could these be the problem, the brown was is crimped right before a connection which is made behind the glove box. The black hose also disapears some behind the glove box, not sure where it goes, but the others go across the dash to connection in the drivers footwell.

I hear people talking about looking at vacuum hoses in the engine bay, I'm, just not sure where to begin on this, the colored hoses behind the dash, the switch itself, or in the engine bay?

Any help appreciated.

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Old 07-11-2010, 01:25 PM   #2
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First pop your hood and take a look at the vacuum line here....driverside engine bay...side of intake manifold.
Most common. If not your issue report back and we'll start weeding out the other places.
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Old 07-11-2010, 01:30 PM   #3
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I've found rotten hoses at the vacuum canister as well... it's located sort of underneath the battery tray area. Never knew it was there until I started chasing a similar concern. It's more easily found from underneath the Jeep.
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Old 07-11-2010, 01:30 PM   #4
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I would say those are the problem. Those are the vacuum lines. 1st make sure they're all pressed onto the back of that switch good. I don't have the factory manual in front of me but try to trace them and make sure all the connections are pressed on good where they end. The brown crimped one could be the problem. If you're near a dealer they would probably give you a printout of the schematic where the lines go.

I'm not sure where to look in the engine bay but look at the firewall for any hoses that may be coming from it and may be disconnected. Good luck
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Old 07-11-2010, 01:42 PM   #5
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Distorted - thanks for the pic, two points to note here. Your finger is pointing to the centre of the three connections. This was a good solid connection, the connection to the right, was off totally, and even when reconnected it is a little loose. This splits on a T joint a few inches off the manifold. Though even after reconnecting this, the direction on AC still didn't work would it take time to build up a vacuum in order to work correctly.

Second point, the middle connection that your finger was pointed at, although this was a good solid connection, I followed it I think it came up past the green screw cover for a valve I think. Then it bends down and the rubber makes a transition to a metal tube. At this transition point, the rubber is worn and cracked, possibly enough for a leak.
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Old 07-11-2010, 01:48 PM   #6
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I would then follow the smaller on that splits at the T joint, across the back of the engine, over to the firewall behind the battery and below the battery, check all the lines there. Thats a common place for a bad hose/connection.

The middle on that runs over by the green cap and those lines there are for the evap system. While one maybe cracked it could cause a code to come up in your ECM for a Evap leak.





1 - SCREW
2 - VACUUM CHECK VALVE (2)
3 - VACUUM LINE RETAINER (2)
4 - ACCESSORY VACUUM SUPPLY LINE
5 - ENGINE VACUUM FITTING
6 - HVAC VACUUM SUPPLY LINE
7 - INNER FENDER
8 - VACUUM RESERVOIR
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Old 07-11-2010, 01:48 PM   #7
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Quote:
Originally Posted by ricci427 View Post
Distorted - thanks for the pic, two points to note here. Your finger is pointing to the centre of the three connections. This was a good solid connection, the connection to the right, was off totally, and even when reconnected it is a little loose. This splits on a T joint a few inches off the manifold. Though even after reconnecting this, the direction on AC still didn't work would it take time to build up a vacuum in order to work correctly.


Second point, the middle connection that your finger was pointed at, although this was a good solid connection, I followed it I think it came up past the green screw cover for a valve I think. Then it bends down and the rubber makes a transition to a metal tube. At this transition point, the rubber is worn and cracked, possibly enough for a leak.
Run a piece of electric tap over the line comming from the manifold to hold it on good. Also run some electric tape over the rubber fitting by the green cap to help it seal.

Try again...if it does work...not your issue and we'll keep going.
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Old 07-11-2010, 02:10 PM   #8
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Distorted - I will tighten the connection that I have found so far, with tape, and possibly a small clip on the one that was really loose of the manifold.

I have to run out to get some tape though as I ran out, I will post later. Also, when I post later I will let you know of some codes that came up during fail on my emissions yesterday, maybe they will help narrow this down. Would something like this cause an engine light, which in turn failed my emissions.

Post later, once taped !!!

Thanks
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Old 07-11-2010, 02:59 PM   #9
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Blow cigarette smoke through the vacuum line where it attaches to the manifold. Where there's smoke there's a leak.
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Old 07-11-2010, 03:24 PM   #10
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hardermods.....that is an awesome diagram! where did you find that? you should post that for every AC problem that someone posts to WF!!!
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Old 07-11-2010, 07:30 PM   #11
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Fixed

Distorted thanks for the help, and thanks to everyone else too. The AC now blows through the correct vents, the photo from distorted helped a lot, as did the schematic from hardermods....
It was a simple as the engine fitting, it is still loose but I will be putting a clamp on it to stop any future mishaps.
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Old 07-11-2010, 10:13 PM   #12
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Quote:
Originally Posted by ricci427 View Post
Distorted thanks for the help, and thanks to everyone else too. The AC now blows through the correct vents, the photo from distorted helped a lot, as did the schematic from hardermods....
It was a simple as the engine fitting, it is still loose but I will be putting a clamp on it to stop any future mishaps.
the fittings get old and dry rot ...it's just the nature of the beast.

The fittings can be picked up at most auto stores for around a buck.


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