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Unread 08-16-2013, 08:23 PM   #1
DavisI
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Cruise Control Vacuum Line?

My cruise control light turns on but it won't hold a speed. This seems to be a common problem and this hose seems to be the issue normally.
I saw this the other day while washing the jeep. Is this the vacuum line for the cruise control?

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Unread 08-16-2013, 09:34 PM   #2
Marksikern
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I don't know what year your jeep is but I have a 1999 and the cruise vacuum line runs from a three way connecter on the passenger side back by the fire wall and runs almost under the top of the firewall toward the drivers side. The 3 way connecter also provides vacuum to the heating and cooling doors and the cut off switch to the AC when accelerating to pass or going up a hill. This can be a damn nuisance when driving in the mountains.

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Unread 08-16-2013, 10:14 PM   #3
DavisI
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Oh, alright. Anybody have any idea what that hose could be then?
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Unread 08-16-2013, 10:57 PM   #4
bradywgn71
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It's the drain hose from the battery tray, in case the battery were to boil over.
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Unread 08-17-2013, 06:48 PM   #5
DavisI
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Oh ok. Is that where it's supposed to be?
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Unread 08-17-2013, 11:56 PM   #6
bradywgn71
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Quote:
Originally Posted by DavisI View Post
Oh ok. Is that where it's supposed to be?
Yea, it just hangs there like that.
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Unread 08-18-2013, 09:17 AM   #7
multmigs
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if you remove your passenger side headlight assembly you will see a black plastic box that is mounted under it and has a nipple facing towards the engine side which is supposed to be attached to the vacuum line for the cruise and HVAC system.
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Unread 08-18-2013, 09:48 AM   #8
imaguy3
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Also check on the throttle body area for any hoses off/missing. My vacuum line for cruise came off from there.

http://www.wjjeeps.com/engine/throttle_bdy_01.jpg

http://www.wjjeeps.com/engine/throttle_bdy_02.jpg
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Unread 08-18-2013, 03:25 PM   #9
grussell
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Once you have the passenger headlight out you will see the black plastic box with a vacuum line attached to it. I just fixed mine this morning. In the picture is the area behind the headlight. You can see the T connector and the cracked hose to the actuator. Both ends were dry rotted. I also replaced the tubing from the T down to the black box. This fixed my cruise control and my AC vents. Before, AC would only blow out the defroster.
hose.jpg

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